ARCB


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:SharesIssued

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostsAndExpenses
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
us-gaap:IncomeTaxAuthority
us-gaap:IncomeTaxesPaid

us-gaap:InterestAndDebtExpense

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ProfitLoss

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:Revenues

us-gaap:Assets

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:InvestmentType

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ShortTermInvestments
us-gaap:InvestmentType

us-gaap:AccountsReceivableNetCurrent

us-gaap:OtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:LeaseholdImprovementsGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:StatementBusinessSegments
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
us-gaap:RetirementPlanType

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OperatingLeaseLiability
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt
us-gaap:DebtInstrument

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:ShareRepurchaseProgram

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:IncomeTaxAuthority

us-gaap:ProceedsFromSaleOfShortTermInvestments
us-gaap:RetirementPlanType
arcb:DefinedBenefitPlanBenefit

arcb:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesHighEndOfRange

arcb:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesLowEndOfRange

arcb:FuelSuppliesAndExpenses
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

arcb:IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities

arcb:IncreaseDecreaseInOperatingRightOfUseAssetsAndLeaseLiabilitiesNet
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
arcb:InnovativeTechnologyCosts
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments
arcb:MultiemployerPensionPlansPercentageOfContributions
us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments
arcb:MultiemployerPlansCriticalAndDecliningStatusThresholdFundedPercentageForGreaterInsolvencyPeriod

arcb:NonoperatingIncomeExpenseAndInterestAndDebtExpense

arcb:OperatingLeaseChangeInOperatingLeaseLiabilities

arcb:OperatingLeaseNoncashChangeInOperatingRightOfUseAssets

arcb:OperatingRightUseOfAssetsAndLeaseLiabilitiesNet

arcb:OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsNetOfTax
us-gaap:RetirementPlanType

arcb:OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsTax
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
arcb:PurchasedTransportation
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
arcb:RentsAndPurchasedTransportation

arcb:RentsPurchasedTransportationOtherCostsOfServices
us-gaap:StatementBusinessSegments
arcb:SegmentPercentageOfRevenueBeforeOtherRevenuesAndIntercompanyEliminations
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
arcb:SharedServices
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
arcb:SuppliesAndExpenses

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:CapitalExpendituresIncurredButNotYetPaid
us-gaap:SubsequentEventType
us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments
us-gaap:ConcentrationRiskPercentage1
us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:Depreciation
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:DirectCommunicationsAndUtilitiesCosts
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:DirectTaxesAndLicensesCosts

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:FairValueOfAssetsAcquired
us-gaap:ConsolidationItems, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:StatementBusinessSegments
us-gaap:GainLossOnSaleOfBusiness
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:GainLossOnSaleOfPropertyPlantEquipment
us-gaap:ConsolidationItems, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType

us-gaap:IncreaseDecreaseInBookOverdrafts

us-gaap:IncreaseDecreaseInIncomeTaxes

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInPrepaidExpense

us-gaap:IncreaseDecreaseInReceivables

us-gaap:InvestmentIncomeInterestAndDividend

us-gaap:LaborAndRelatedExpense
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:LeaseCost
us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments
us-gaap:MultiemployerPlanContributionRateIncreaseDecrease
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:OperatingInsuranceAndClaimsCostsProduction

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax

us-gaap:OtherCostAndExpenseOperating
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireShortTermInvestments

us-gaap:PaymentsToDevelopSoftware

us-gaap:ProceedsFromAccountsReceivableSecuritization
us-gaap:IncomeTaxAuthority
us-gaap:ProceedsFromIncomeTaxRefunds
us-gaap:Range, us-gaap:IncomeTaxAuthority
us-gaap:DebtInstrument
us-gaap:ProceedsFromIssuanceOfDebt
us-gaap:DebtInstrument, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:DebtInstrument, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProvisionForDoubtfulAccounts
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax
us-gaap:DebtInstrument
us-gaap:RepaymentsOfAccountsReceivableSecuritization

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:SubleaseIncome
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents

us-gaap:VariableLeaseCost

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

arcb:AllowancesForCreditLossesAndReserveForCustomerDeductions
us-gaap:BalanceSheetLocation
arcb:BookOverdrafts

arcb:DebtInstrumentCollateralAccumulatedDepreciationAndAmortizationPropertyPlantAndEquipment

arcb:DebtInstrumentCollateralPropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

arcb:DebtInstrumentCollateralPropertyPlantAndEquipmentNet
us-gaap:DebtInstrument
arcb:DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance
us-gaap:DebtInstrument, us-gaap:DerivativeInstrumentRisk
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:DerivativeInstrumentRisk
us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk
us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

arcb:DeferredCompensationCashBasedArrangementsLiabilityNoncurrent

arcb:DeferredTaxAssetsMultiemployerPensionFundWithdrawal

arcb:DeferredTaxAssetsOperatingLeaseLiabilities

arcb:DeferredTaxAssetsTaxDeferredExpenseSupplementalPensionLiabilities

arcb:DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets

arcb:DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherLongLivedAssets

arcb:DepositsUninsuredAmount
us-gaap:DebtInstrument, us-gaap:MeasurementInputType
arcb:FinancialInstrumentMeasurementInput

arcb:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour

arcb:LandAndStructuresGross
us-gaap:PropertyPlantAndEquipmentByType
arcb:LesseeOperatingLeaseLeaseNotYetCommencedAmount

arcb:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:DebtInstrument
arcb:LineOfCreditFacilityAdditionalBorrowingCapacity

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue
us-gaap:DebtInstrument

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent
us-gaap:DebtInstrument

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears
us-gaap:DebtInstrument

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears
us-gaap:DebtInstrument

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears
us-gaap:DebtInstrument

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears
us-gaap:DebtInstrument

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueThereafter
us-gaap:DebtInstrument

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments
us-gaap:DebtInstrument
us-gaap:IncomeTaxAuthority
arcb:OperatingLossCarryforwardsExpireInTenYears

arcb:PrepaidAndIncomeTaxesReceivableCurrent

arcb:RevenueEquipmentGross

arcb:ServiceOfficeAndOtherEquipmentGross
us-gaap:DebtInstrument
arcb:SuretyBondsAmountOutstandingUnderUncollateralizedProgram

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent
us-gaap:BalanceSheetLocation, us-gaap:EnvironmentalRemediationContingency
us-gaap:AccruedEnvironmentalLossContingenciesCurrent

us-gaap:AccruedSalariesCurrent

us-gaap:AccruedVacationCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent
us-gaap:StatementEquityComponents
us-gaap:AociBeforeTaxAttributableToParent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:CapitalizedComputerSoftwareGross
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk
us-gaap:CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashSurrenderValueOfLifeInsurance
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateEffectivePercentage

us-gaap:DebtWeightedAverageInterestRate
us-gaap:DebtInstrument
us-gaap:BalanceSheetLocation, us-gaap:DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensation
us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent
us-gaap:DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensation
us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent
us-gaap:BalanceSheetLocation, us-gaap:DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensation
us-gaap:DeferredCompensationPlanAssets

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeAmountOfHedgedItem
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeFixedInterestRate
us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType
us-gaap:BalanceSheetLocation, us-gaap:DisposalGroupClassification
us-gaap:DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:IntangibleAssetsGrossExcludingGoodwill
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:InvestmentsFairValueDisclosure
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LettersOfCreditOutstandingAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
us-gaap:DebtInstrument
us-gaap:BalanceSheetLocation, us-gaap:RetirementPlanName, us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments
us-gaap:MultiemployerPlansWithdrawalObligation
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwardsValuationAllowance

us-gaap:OtherReceivablesNetCurrent
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PrepaidExpenseCurrent

us-gaap:SelfInsuranceReserveCurrent
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramAuthorizedAmount1
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
us-gaap:IncomeTaxAuthority
us-gaap:TaxCreditCarryforwardValuationAllowance

us-gaap:TreasuryStockCommonValue
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Net Income Loss
Expenses
Other Nonoperating Income Expense
Balance Sheet
Intangible Assets Net Excluding Goodwill
Assets
Operating Lease Right Of Use Asset
Current Assets
Other Assets Current
NonCurrent Assets
Deferred Income Tax Assets Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Accrued Income Taxes Current
Noncurrent Liabilities
Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent
Stockholders Equity
Common Stock Value
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Dividends Common Stock Cash
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Undiscounted Excess Amount
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue █▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁0.2930.2910.290.290.290.2880.2880.2880.2880.2870.2870.2850.2850.2850.2850.2850.2850.2820.2820.2810.2810.280.2790.2790.2780.2770.2770.2770.2770.2750.2750.2740.2740.2730.2730.2730.2730.2710.2710.2710.2710.270.269NANANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock█▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁29.31829.05729.04529.0428.95828.81728.81128.80128.78628.68528.68528.54828.54228.49928.49628.47828.4528.19328.17428.12228.11327.95127.93827.93227.78527.73927.72227.69727.69227.54727.50727.40827.3927.30827.29627.29527.26227.1427.127.127.126.97626.935NANANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:TreasuryStockCommon█▇▇▇▇▇▆▅▅▅▄▃▃▃▃▃▂▁▁▁3.7833.6723.6573.6323.5553.5553.4053.33.2663.1723.0982.8572.8572.8572.8522.8522.762.5652.5652.5NANA2.08NANANA1.678NANANA1.678NANANANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ██▇▇▅▅▃▆▆▆▇▇▇▇▇▆▆▃▅▅▅▄▆▆▇▇▅▅▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁26.91079626.93040226.73428726.59245726.21795726.246825.49039326.41659526.43159226.51234926.68226226.79565926.69954926.59637626.54071626.39335926.29164125.68447526.27248726.21152426.24686825.82252226.41583926.50848226.59345126.58851826.07325626.05467826.00510525.87692825.79336625.7368125.69432725.63833325.62930925.61331525.54445525.45560725.42188725.42188725.41194225.29685425.22398625.19912325.18257925.088473
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▅▄▃▄▄▃▄▄▄▄▅▅▅▅▅▅▆▅▅▆▆▆▇██████▇▆▆▅▅▅▅▄▄▃▃▃▂▂▂▂▁25.58635325.45492125.42744925.47009425.46355925.39037725.49039325.52798225.55428625.57041525.70733525.69750925.67032525.64287125.63756825.67153525.76779125.68447525.6692825.7245525.79102625.82252225.93670926.00934426.02187426.05103826.07325626.05467826.00510525.87692825.78548525.7368125.69432725.63833325.62930925.61331525.54445525.45560725.42188725.42188725.41133925.29685425.22398625.19912325.18257925.088473
us-gaap:EarningsPerShareBasic █▅▅▅▄▃▂▄▅▃▄▆▃▄▆▄▄▂▃▄▄▂▃▄▄▃▄▄▄▂▄▄▃▂▂▃▄▁▃▄▃▂▃▃▂▁2.380.920.941.150.620.07-0.220.640.950.190.591.580.050.391.420.570.61-0.290.060.50.39-0.240.190.730.760.030.530.720.63-0.20.380.520.18-0.52-0.310.240.44-0.710.050.460.2-0.51-0.12-0.03-0.3-0.85
us-gaap:EarningsPerShareDiluted █▅▅▅▄▃▂▄▅▃▄▆▃▄▆▄▄▂▃▄▄▂▃▅▅▃▄▅▄▂▄▄▃▂▂▃▄▁▃▄▃▂▃▃▂▁2.270.870.891.110.610.07-0.220.620.920.180.571.520.050.371.370.560.6-0.290.060.490.39-0.240.190.720.740.030.530.720.63-0.20.380.520.18-0.52-0.310.240.44-0.710.050.460.2-0.51-0.12-0.03-0.3-0.85
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 Cost Ratio us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,arcb:ArcbestSegment█▇▇▅▁▂▃▄▃▃▄▄▄▃▃▄▃▂▃▃▂▁270.748252.336245.579217.294151.467164.775184.257199.758181.173173.204193.754205.449199.987181.933182.144195.749175.929152.876172.999170.991154.347142.397NANANANANANANANANANANANANANANANANANANANANANANANA
 Cost Ratio us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,arcb:AssetBasedSegment█▅▅▅▂▄▃▅▅▃▅▆▅▂▃▄▃▂▂▃▃▁652.832556.292554.392561.856460.07515.713513.331565.621559.648506.079548.941585.29559.239482.115497.004517.417514.537464.356482.079509.001486.251439.063NANANANANANANANANANANANANANANANANANANANANANANANA
 Cost Ratio us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,arcb:FleetnetSegment██▇▅▄▆▆▆▆▆▅▅▄▄▂▂▁▂▂▂▃▃59.54759.16355.62550.54546.4452.43952.78153.97651.72253.25950.08150.49446.79247.75940.03439.56836.50140.23838.21239.07341.7843.564NANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,arcb:ArcbestSegment█▇▇▅▁▂▃▄▃▃▄▄▄▃▃▄▃▂▃▃▂▁270.748252.336245.579217.294151.467164.775184.257199.758181.173173.204193.754205.449199.987181.933182.144195.749175.929152.876172.999170.991154.347142.397NANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,arcb:AssetBasedSegment█▅▅▅▂▄▃▅▅▃▅▆▅▂▃▄▃▂▂▃▃▁652.832556.292554.392561.856460.07515.713513.331565.621559.648506.079548.941585.29559.239482.115497.004517.417514.537464.356482.079509.001486.251439.063NANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,arcb:FleetnetSegment██▇▅▄▆▆▆▆▆▅▅▄▄▂▂▁▂▂▂▃▃59.54759.16355.62550.54546.4452.43952.78153.97651.72253.25950.08150.49446.79247.75940.03439.56836.50140.23838.21239.07341.7843.564NANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 TTM Greenblatt ROC _ _█▅▅▆▄▃▂▅▅▃▅▇▃▄▄▄▄▂▃▄▄▂▃▅▅▃▄▅▅▂▄▄▃▁▂▄▃▁▃▄▃▁▂74.29932.19130.25239.78220.4257.819-11.22931.20835.28.59137.16256.0553.15612.72516.6824.34924.734-12.2531.21120.3716.654-9.2657.31233.43833.4661.2818.04932.94126.952-8.70213.50220.5028.417-23.35-11.01612.2337.201-22.9871.63521.1188.998-21.992-6.694NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:ComprehensiveIncomeNetOfTax █▅▅▅▄▃▃▅▅▄▅▆▃▄▆▄▄▂▃▄▄▂▃▄▅▃▄▄▄▂▄▄▆▂▂▄▄▂▁▄▃▂▃▃▂61.65924.16526.47130.12716.054-0.5652.28421.06924.3356.73823.68135.9983.46914.02638.19514.61316.558-6.7976.60615.3449.115-8.3345.07712.51923.675-0.4349.76517.70118.091-7.94716.90418.24534.786-11.664-12.0958.30813.524-16.439-23.80212.9086.402-11.6981.4910.599-6.51NA
us-gaap:CostsAndExpenses █▇▇▆▄▅▆▆▆▅▆▆▇▅▅▆▅▅▅▅▅▄▅▅▅▄▅▅▄▄▃▄▄▃▃▃▃▂▂▂▂▂▂▂▁▁874.674797.022786.162755.198606.945693.58728.647756.355736.29703.248737.117770.103790.194687.276694.041719.931695.634663.341687.003693.553659.973630.72640.822675.942662.649611.996646.799678.354631.694586.606565.047602.912568.482544.037548.058565.313503.342463.854461.606489.769489.552456.923447.79447.307422.157395.155
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest █▅▄▅▄▂▁▄▅▃▄▆▂▃▃▄▄▁▂▄▃▁▃▅▅▂▄▅▄▁▃▄▃73.45831.34730.19939.17820.7342.385-12.02723.34233.566.59620.6753.9910.7348.99116.0224.06824.135-12.6471.09620.55516.381-9.7456.86732.04632.9090.91219.6432.55627.371-8.95513.89521.0047.865NANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit █▇▇▇▆▅▄▇▇▆▆█▅▅▁▇▇▄▅▇▇▅▆██▅▆█▇▄▆▇▆▃▄▆▄▄▅▇▆▄▅▅▄▂12.4777.9866.2859.7744.8540.483-6.4787.0729.1841.7085.37113.215-0.499-0.963-20.5489.288.358-5.24-0.4887.6156.15-3.6421.87812.89212.9420.1675.09712.93810.163-3.7623.5497.0222.987-9.908-4.3875.258-5.757-4.3740.536.8083.169-7.346-3.454-0.385-4.079-13.458
 us-gaap:IncomeTaxesPaid us-gaap:IncomeTaxAuthority arcb:DomesticStateAndLocalJurisdictionNA6.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestAndDebtExpense ▅▅▆▇█▇▇▇▇▇▇▆▄▅▄▄▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▂▂▂2.2742.4282.5122.863.3782.9472.8742.92.8112.8822.9262.472.0132.0591.9321.7061.3891.3151.3761.2961.2311.2471.2171.1571.0251.0020.8230.8340.7250.8080.9040.9931.0791.207NANANANANANANANANANANANA
us-gaap:NetIncomeLoss █▅▅▅▄▃▂▄▅▃▄▆▃▄▆▄▄▂▃▄▄▂▃▄▅▃▄▄▄▂▄▄▃▂▂▃▄▁▃▄▃▂▃▃▂▁60.98123.36123.91429.40415.881.902-5.54916.2724.3764.88815.29940.7761.2339.95436.56814.78815.777-7.4071.58412.9410.231-6.1034.98919.15419.9670.74514.54319.61817.208-5.19310.34613.9824.878-13.395-7.9296.51811.841-18.1621.40412.2655.298-12.808-3.109-0.749-7.444-21.391
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic █▅▅▅▄▃▂▄▅▃▄▆▃▃▆▄▄▂▃▄▄▂▃▄▄▃▄▄▄▂▃▄▃▁▂▃▄▁▃▄▃▁▂▃▂60.98123.36123.93629.415.8631.901-5.54316.26824.3654.87915.27740.6781.2299.92436.43614.74415.712-7.4241.57812.85110.15-6.1214.95618.97919.760.72613.83518.63716.36-5.2329.86913.3974.663-13.433-7.9656.20911.292-18.1961.34611.7335.085-12.838-3.139-0.77-7.444NA
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted █▅▅▅▄▃▂▄▅▃▄▆▃▃▆▄▄▂▃▄▄▂▃▄▄▃▄▄▄▂▃▄▃▁▂▃▄▁▃▄▃▁▂▃▂60.98123.36123.93629.415.8631.901-5.54216.26824.3654.87915.27840.6821.2299.92536.43914.74515.713-7.4241.57812.85310.151-6.1214.95518.98219.7640.72613.83518.63716.36-5.2329.86913.3974.663-13.433-7.9656.20911.292-18.1961.34611.7335.085-12.838-3.139-0.77-7.444NA
us-gaap:OperatingIncomeLoss █▅▅▆▅▄▃▅▆▄▆▇▃▄▄▅▅▂▃▅▄▃▄▅▅▃▄▅▅▃▄▅▄▂▃▄▄▂▃▅▄▂▃▃▃▁74.29932.19130.25239.78220.4257.819-11.22931.20835.28.59137.16256.0553.15612.72516.6824.34924.734-12.2531.21120.3716.654-9.2657.31233.43833.4661.2818.04932.94126.952-8.70213.50220.5028.417-23.35-11.01612.2337.201-22.9871.63521.1188.998-21.992-6.694-1.776-10.81-35.266
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax ▆█▇▆▅▁▆▄▃▄0.1660.5750.2530.136-0.174-0.9970.191-0.338-0.528-0.332NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▇▆█▇▇▁▆▅▆▆▄▆▅▅▅▆▅▆▆▄▅▇▅▄▆▄0.6120.3290.9270.6970.457-1.420.241-0.0350.1160.225-0.5160.127-0.22-0.072-0.1540.294-0.2080.1190.223-0.42-0.1350.584-0.16-0.3540.097-0.295NANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▇▇███▅▇▄▇▇▁▇▆▆▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▆▇█▇▇▇▇1.1111.1921.9651.52.696-3.8620.485-6.734-0.445-0.591-15.12-0.714-1.123-2.2010.8841.0790.5050.6470.9161.0910.5710.3660.369-0.6130.1970.42.1630.2340.950.3651.1151.3280.3661.083-0.0760.997-0.221.341.074-1.3450.2812.610.8481.346-0.4570.668
us-gaap:ProfitLoss █▄▄▅▃▂▁▃▄▂▃▆▂▃▆▃▃▁▂▃60.98123.36123.91429.40415.881.902-5.54916.2724.3764.88815.29940.7761.2339.95436.56814.78815.777-7.4071.58412.94NANANANANANANANA17.208-5.193NANA4.878-13.395-7.9296.51811.841-18.1621.40412.2655.451-12.787-3.117-0.585-7.348-21.371
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▇▆▆▄▅▅▆▆▅▆▇▆▅▅▆▅▄▅▅▅▄▄▅▅▄▅▅▅▄▄▄▄▃▃▄▃▂▂▃▃▂▂▂▂▁948.973829.213816.414794.98627.37701.399717.418787.563771.49711.839774.279826.158793.35700.001710.721744.28720.368651.088688.214713.923676.627621.455648.134709.38696.115613.276664.848711.295658.646577.904578.549623.414576.899520.687537.042577.546510.543440.867463.241510.887498.55434.931441.096445.531411.347359.889
us-gaap:Revenues █▇▆▆▄▅▅▆▆▅▆▇▆▅▅▆▅▄▅▅▅▄▄▅▅▄▅▅▅▄▄▄▄▃▃▄▃▂▂▃▃▂▂▂▂▁948.973829.213816.414794.98627.37701.399717.418787.563771.49711.839774.279826.158793.35700.001710.721744.28720.368651.088688.214713.923676.627621.455648.134709.38696.115613.276664.848711.295658.646577.904578.549623.414576.899520.687537.042577.546510.543440.867463.241510.887498.55434.931441.096445.531411.347359.889
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets █▇▇▇██▆▇▆▆▆▆▅▄▅▄▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▃▂▁▁▁▁▁▁1841.4731768.0151779.0081746.2311870.761834.3561651.2071670.6321633.9271559.6571539.2311517.6821432.2961358.0831365.6411344.4321312.2611244.4831309.9921320.8681283.1741245.2311262.9091244.2861192.0481141.6991127.6221140.5671085.0631021.6451017.3261038.1231024.61011.3951034.4621080.031067.031887.187916.22908.372887.515857.711860.951NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇▇▇██▆▇▆▆▆▆▅▄▅▄▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▃▂▁▁▁▁▁▁1841.4731768.0151779.0081746.2311870.761834.3561651.2071670.6321633.9271559.6571539.2311517.6821432.2961358.0831365.6411344.4321312.2611244.4831309.9921320.8681283.1741245.2311262.9091244.2861192.0481141.6991127.6221140.5671085.0631021.6451017.3261038.1231024.61011.3951034.4621080.031067.031887.187916.22908.372887.515857.711860.951NANANA
us-gaap:StockholdersEquity █▇▇▇▆▆▆▆▆▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▂▁▁▁898.134851.909828.593802.639775.091759.206763.043763.626743.159721.755717.682705.091668.515665.474651.462613.565602.08591.676598.897595.153582.491577.251588.728586.795579.204557.931560.883551.082532.47514.197520.461499.683481.153447.593458.999470.658462.367449.449465.615488.797476.467469.326479.744NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ▇▆▆▆██▅▅▅▄▅▄▄▃▃▃▃▂▃▃▃▃▃▄▃▃▃▃▂▂▂▂▁▁▁▁▁▂▂▂▂▁▁843.531768.719758.168730.24902.043869.531664.402657.988651.45606.542649.226631.574590.066532.136522.349519.027501.684464.063521.989532.874547.879533.76552.083580.482561.905529.023514.989524.513477.224432.946418.485434.65405.293378.751386.05408.039398.54430.513445.086445.401434.617409.189399.684NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▇▆▆▅█▇▄▄▄▃▄▄▃▂▂▂▂▂▂▃▃▃▃▄▄▃▃▃▃▂▂▂▂▂▂▁▁▃▃▃▂▂▂▂▂▁362.619301.542303.954267.645406.29352.165201.909183.838181.731138.399190.186177.436159.307124.652120.772109.034102.56982.253114.28130.395152.236134.788164.973191.646192.016166.022157.042159.382129.1595.728105.354107.61188.55375.07190.70271.34153.618138.516141.295137.099114.83486.784102.57899.50680.45749.246
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▇▆▆▅█▇▄▃▃▂▃▃▃▂▂▂▁▁▂▂362.619301.542303.954267.645406.29352.165201.909183.838181.731138.399190.186177.436159.307124.652120.772109.034102.56983.215115.242131.357NANA166.357NANANA158.428NANANANANANANANANANANANANANANANANANANA
us-gaap:ShortTermInvestments ▂▂▃▄▇█▅▅▅▅▅▃▃▂▂▂▂▂▂▂▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▂▂▂▁▁▁▂▁59.96759.31665.40883.411167.719178.81116.579124.257117.657116.225106.80675.87968.01354.66956.40157.05254.14856.98456.83859.34664.08169.60861.59769.56753.83645.9845.90943.85836.01535.9635.90628.57329.87929.89129.05447.73246.61945.16733.9630.99237.57942.30939.288NANANA
us-gaap:AccountsReceivableNetCurrent █▇▇▇▅▅▅▆▆▆▆▇▆▆▅▆▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▂▂▃▃▁▁▂▂▂▁360.498344.242320.87323.76273.135278.783282.579292.935296.09294.853297.051323.212309.112289.366279.074301.941282.856258.931260.643256.316238.775226.796236.097242.656245.039230.715228.056243.099236.201221.87202.54212.946206.168190.036180.631209.46201.668150.183149.665165.259170.66161.726145.426NANANA
us-gaap:OtherAssetsCurrent ▂▂▁▂▂▁▂▂▂▁▅▅▆▅█▅▅▅▁▁▂▂▁▂▂▂▂▄▅▅▄▅▄▄▄▅▆▃▃▂▂▃▂4.9374.8934.4225.2354.9234.464.7455.2854.9824.4669.0079.0389.5099.02912.1328.8348.2938.2264.34.2755.225.0123.9365.1445.0724.9074.9687.4898.1368.1446.9528.8827.3067.2887.1858.5999.8055.9586.1865.2515.2215.7655.677NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:PropertyPlantAndEquipmentGross ████▇▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁1704.9181678.6871671.0971665.4531635.271625.411632.9471628.2791599.2131555.9211545.0031531.1261487.9551459.1221456.1741419.7121396.4931361.7711351.71352.5621319.661285.2261271.3981249.4751204.261171.9591161.9251146.9631127.4951098.0511094.591091.2661087.0781080.9621079.321083.0941077.3071006.41007.5891000.95981.02963.832960.027NANANA
us-gaap:LeaseholdImprovementsGross ▄▄▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁██▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆15.83515.53415.15614.06411.82111.02210.38310.21210.0589.7669.3659.1779.1318.9488.8889.2289.0088.99327.33727.0425.95525.64525.41924.96224.64924.49624.37723.94123.83723.63723.58223.52423.44223.35723.27222.94323.021.75821.42621.25821.19822.04921.89NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ██▇▇▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁1038.9741015.989992.407987.396974.464961.95949.355948.205947.264932.945913.815904.18896.738884.959865.01850.054841.245838.147819.174822.623812.287802.62788.351790.536779.813766.217752.075735.09724.965713.493700.193691.73673.074653.862635.292622.888614.335605.15592.171590.418582.686569.027552.781NANANA
us-gaap:AmortizationOfIntangibleAssets ▂▃▅▃▃▃▄▆▇▇▇▇▇▇▇▇▇▇█▆▄▃▂▁▆▇▆▆▆▅▅▄▆▅▅▄0.960.9671.070.9830.9780.9811.0021.1161.1211.1281.1271.131.131.1341.1341.1331.1351.1361.181.11.00.9870.9230.91.11.1481.111.11.11.0431.0441.01.11.0431.0431.018NANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentNet ████▇███▇▇▇▇▆▅▆▅▅▄▄▄▄▃▃▃▂▁▂▂▁▁▁▁▂▂▂▃▃▁▂▂▁▁▂665.944662.698678.69678.057660.806663.46683.592680.074651.949622.976631.188626.946591.217574.163591.164569.658555.248523.624532.526529.939507.373482.606483.047458.939424.447405.742409.85411.873402.53384.558394.397399.536414.004427.1444.028460.206462.972401.25415.418410.532398.334394.805407.246NANANA
us-gaap:Goodwill ▃▄▄▄▄▄▄█████████████▅▅▅▃▃▂▂▂▂▂▂▂▂▁▁▂▃86.36888.3288.3288.3288.3288.3288.32108.32108.32108.32108.32108.32108.32108.32108.32108.981108.981108.981108.875110.48796.57296.57796.46581.27881.25880.69677.07877.07877.74976.44876.44876.44876.44875.03273.18979.05182.604NA3.7NANANA3.7NANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass us-gaap:TradeNames████████████████████████████████████▁32.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.332.34532.332.332.332.332.332.332.331.7NANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▁▁▂▂▂▂▄▄▅▅▅▅▆▆▇▇▇██▆▇▇▅▅▆▆▆▆▆▆▇▇▇▇█▅53.08454.02854.98156.01656.91557.87358.83265.58366.767.8268.94970.07571.20672.33673.46977.10378.23779.37180.50782.06875.376.376.78770.4171.2772.86272.80973.91974.46274.34475.38776.43177.47478.51879.56180.60471.222NA2.822NANANANANANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▁▁▂▂▂▂▃▄▅▅▅▆▆▆▆▇▇▇██▆▆▇▅▅▆▆▆▆▆▆▆▇▇▇█▅20.78421.72822.68123.71624.61525.57326.53233.28334.435.5236.64937.77538.90640.03641.16942.30343.43744.57145.70746.94640.17841.17841.66535.28836.14837.7437.68738.79739.20939.22240.26541.30942.35243.39644.43945.48236.7NANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▇▇██▃▂▁▁▁▁109.86111.412115.195112.56881.06973.32468.4767.40468.8168.737NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▆▆▆▅▅▅▇█▇▆▅▆▃▃▃▄▃▃▄▄▁▁▁76.26776.54977.49674.05574.173.70379.86685.13580.40278.35774.0874.865.26165.03364.37466.91665.38965.3866.09565.556.0555.98854.527NANANANANANANANANANANANANANANANANANA53.71754.021NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccountsPayableCurrent █▇▆▆▅▄▅▆▆▅▅▆▇▅▄▅▅▄▅▅▅▅▄▅▅▄▃▅▄▃▂▃▃▂▂▂▃▁▁▂▂▁▁204.124177.885170.898162.021140.632127.625134.374160.054166.829145.59143.785154.484176.034139.83129.099147.889142.373130.75133.301149.971145.423139.607130.869144.401147.781115.566104.23135.022121.195110.36489.09195.60994.7784.96684.29290.24594.56167.64766.51774.65682.9569.32462.134NANANA
us-gaap:AccruedIncomeTaxesCurrent 7.357NA0.3160.0053.1810.0310.0120.1981.9420.2411.6880.1380.5110.0930.324NANANANANANANA0.0918.4894.8690.2570.52716.8096.9470.1621.7822.8680.1620.0750.0590.430.220.1080.1695.7870.3480.1290.196NANANA
us-gaap:AccruedLiabilitiesCurrent █▆▇▇▅▅▆▆▆▅▇▆▆▅▅▅▄▄▄▄▃▃▄▄▄▃▄▄▃▃▃▃▃▂▂▂▂▂▁▂▂▂▁260.185235.161246.746249.172217.02217.678228.749234.863228.994211.533243.111233.076221.88202.656211.237202.408200.052190.829190.024187.822184.141176.918188.727193.997187.821176.737194.674187.682179.141171.433173.622181.197170.414167.848158.668159.378163.159159.295151.887156.537157.589153.724144.543NANANA
us-gaap:LiabilitiesCurrent █▇▇▇▅▅▆▆▆▅▆▆▆▅▅▅▅▄▄▅▄▄▄▄▄▃▃▄▄▃▃▃▃▃▂▃▃▂▂▂▂▁▁560.26500.742506.547497.516439.652422.853444.277465.725471.474431.835451.318454.894449.987398.636402.59413.301405.013381.574387.468399.044384.97362.43364.597381.937364.495329.498340.782395.515360.693327.693309.617326.672318.048304.487299.708317.105319.549267.972263.671272.79272.093250.484233.897NANANA
us-gaap:OperatingLeaseLiabilityCurrent █▇▇▆▄▆▅▂▂▁21.9521.63221.48220.43119.76920.54220.26518.49218.27317.678NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent NANA12.962NANANA16.0NANANA37.539NANANA31.301NANANA23.191NANANA23.342NANANA22.135NANANA15.058NANANA8.019NANANA8.405NANANA8.831NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LongTermDebtAndCapitalLeaseObligations ▃▄▄▄██▅▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▃▃▁▁▁▁▁▁171.075200.773217.119226.037473.85476.945266.214248.223235.001227.649237.6235.97198.07196.425206.989200.181194.73167.075179.53176.363170.044157.485167.599156.553136.821132.837102.47485.73582.96774.35581.33288.89396.946105.169112.941132.355133.79634.79546.7545.938.1639.05942.657NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▆▇█▇▅▆▇▇▅▄▄▄▁▃▃▅▅▃▄64.95767.60872.40767.62760.39363.16766.2170.06661.11155.87356.44153.74141.09948.24449.15760.63258.22550.77354.68NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent ▁▁▁▁▁▁▁▂▂▂▂▂▂▂▃▃▂▃▂▃▃▄▄▄▃▃▃▂▂▂▂▃▄██▇▇██▅▅▅▅18.51418.51818.55520.48620.44820.41120.29432.05931.87431.69531.50427.61436.16936.98439.82740.16837.02837.54135.84842.5245.59556.60351.24149.97839.6244.44842.41837.27233.98334.58726.84738.0451.941105.922104.67393.49191.869105.241106.57866.90765.20463.46665.421NANANA
us-gaap:OtherLiabilitiesNoncurrent ▆▆▇▆▆▆▇▇▆▆█▇▇▁▂▂▂▂▂▂▁▁▁▁▁▁▂▁▂▁▂▁▁▁▁▁▁▁▁▁▂▂▃35.72233.99237.94835.37736.07735.05838.89238.15137.26836.40644.68640.37238.45612.3215.61616.58515.18515.84416.7915.15912.30112.20612.68912.75512.29512.7416.66714.48214.65713.21715.04113.5612.55812.36612.83212.62812.6312.81913.75113.93317.71318.23719.827NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▇▇██▃▂▁▁▁▁92.81194.47397.83996.54965.24956.71652.27752.78254.0454.444NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▃▂█▆▇▄▁▆▅▃18.28117.24821.07320.00820.61918.42616.73720.13119.15217.924NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ▇▅█▆█▄▁▆▅▃16.0215.08816.75515.75516.46213.92212.25315.60414.71613.675NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▆▅█▇▅▃▁▄▃▂13.40712.56114.66813.76612.17610.4598.87111.18910.3729.49NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA12.153NA10.1857.8176.2758.0687.556.748NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive us-gaap:PropertyPlantAndEquipmentByType arcb:LandAndStructuresNANA12.153NA10.1857.8176.2758.0687.55NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA43.035NA23.07216.89113.30918.67618.10917.564NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:PropertyPlantAndEquipmentByType arcb:LandAndStructuresNANA43.035NA23.07216.89113.30918.67618.109NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity █▇▇▇▆▆▆▆▆▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▂▁▁▁898.134851.909828.593802.639775.091759.206763.043763.626743.159721.755717.682705.091668.515665.474651.462613.565602.08591.676598.897595.153582.491577.251588.728586.795579.204557.931560.883551.082532.47514.197520.461499.683481.153447.593458.999470.658462.367449.449465.615488.797476.467469.326479.744NANANA
us-gaap:CommonStockValue █▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁0.2930.2910.290.290.290.2880.2880.2880.2880.2870.2870.2850.2850.2850.2850.2850.2850.2820.2820.2810.2810.280.2790.2790.2780.2770.2770.2770.2770.2750.2750.2740.2740.2730.2730.2730.2730.2710.2710.2710.2710.270.269NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ▇██▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁338.263344.542342.354339.908337.942336.064333.943331.773329.388327.762325.712325.533322.895321.265319.436317.677316.334316.802314.916313.794311.924311.199309.653307.939307.268304.57303.045301.365299.631298.635296.133291.445290.355290.776289.711288.468287.678287.478286.408284.991284.771283.236281.169NANANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▇▆▆▆▆▆▅▅▅▅▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁676.179617.256595.932574.053546.689532.858533.187540.778526.551504.225501.389488.158449.442450.267438.379403.868391.143377.444387.161387.646376.78368.636376.827373.936356.36337.971338.81325.91307.115290.723296.735287.204274.027269.955284.157292.893287.182276.149295.108294.501283.034278.533292.129NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ████▇▇█▇▆▆▆▅▆▅▅▅▅▅▅▄▄▄▅▅▅▅▅▆▆▆▆▅▅▁▁▂▁▁▁▄▄▄▄2.6721.9941.19-1.367-2.09-2.2640.203-7.63-12.429-12.388-14.238-22.62-17.842-20.078-20.574-22.201-22.026-22.807-23.417-28.439-30.843-29.727-27.496-27.585-20.95-24.658-23.479-18.7-16.783-17.666-14.912-21.47-25.733-55.641-57.372-53.206-54.996-56.679-58.402-33.196-33.839-34.943-36.053NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁3.3242.354NA2.8852.892.181NA2.4092.8012.0582.2282.6411.6741.871.8881.4711.8681.7311.4371.9512.4911.7091.6862.112.5861.6471.6361.6942.11.5681.9151.0941.1821.3031.3571.3691.91.4421.3341.4173.6991.446NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▂▄▅▄▂▃▄▆▁▆▄▆▃▄▄▄▁▂▃123.36622.53454.72369.19958.93823.12932.35157.54283.842-3.37181.76854.01587.78931.77553.57447.01549.5651.76122.59835.582NANANANANANANANANANANANANANANANANANANANA39.486-6.354NANA24.903-5.675
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▄▄█▄▁▄▂▃▃▂▃▃▄▃▃▄▄▃▂-10.5941.074-5.07878.3411.349-67.151-7.699-36.901-27.689-25.952-36.644-18.261-33.589-6.456-20.158-22.458-12.734-13.119-18.496-41.673NANANANANANANANANANANANANANANANANANANANA-9.763-5.941NANA8.76218.596
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▅▅▁▅█▅▅▅▅▅▅▅▅▅▅▅▅▅▅-51.695-26.02-13.336-286.185-6.162194.278-6.581-18.534-12.821-22.464-32.374-17.625-19.545-21.439-21.678-18.092-17.477-20.669-20.217-15.749NANANANANANANANANANANANANANANANANANANANA-1.673-3.499NANA-2.454-3.007
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▆▄▅▁▆█▅▄▅▃▅▅▅▄▅▅▅▄▄61.077-2.41236.309-138.64554.125150.25618.0712.10743.332-51.78712.7518.12934.6553.8811.7386.46519.354-32.027-16.115NANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit ▃▃▅▅▃▃▂▅▅▄▃▆▂▃▁▄▅▃▃▄▅▅█▃▃▄▆▃▄▃▃▄▄▂▃▅▃▃▅▄▄▃▃▄▃▃-2.614-4.9984.8848.001-2.355-2.815-8.6888.9755.708-0.584-1.82514.515-8.069-2.749-16.0593.1596.884-4.197-4.6770.6648.3235.21224.297-5.303-4.0661.50712.101-5.0511.135-3.493-4.597-0.0092.995-8.756-6.5644.725-4.219-4.3019.858-0.2330.037-6.606-4.7351.479-3.232-4.968
us-gaap:DepreciationDepletionAndAmortization ████▇▇▇▇▆▅▆▆▆▅▅▅▄▄▅▅▅▄▄▃▃▂▂▂▂▁30.28230.35430.2630.03229.08629.01329.13429.36127.43426.53726.93628.02627.18726.48626.24725.49725.20925.39426.36125.79325.74825.15124.82123.37322.61622.23222.36722.17821.22420.453NANANANA24.98222.80220.6519.3219.54118.2318.05317.91817.79417.67517.61718.479
us-gaap:NetCashProvidedByUsedInOperatingActivities █▂▄▅▄▂▃▄▆▁▆▄▆▃▄▄▄▁▂▃123.36622.53454.72369.19958.93823.12932.35157.54283.842-3.37181.76854.01587.78931.77553.57447.01549.5651.76122.59835.582NANANANANANANANANANANANANANANANANANANANA39.486-6.354NANA24.903-5.675
us-gaap:NetIncomeLoss █▅▅▅▄▃▂▄▅▃▄▆▃▄▆▄▄▂▃▄▄▂▃▄▅▃▄▄▄▂▄▄▃▂▂▃▄▁▃▄▃▂▃▃▂▁60.98123.36123.91429.40415.881.902-5.54916.2724.3764.88815.29940.7761.2339.95436.56814.78815.777-7.4071.58412.9410.231-6.1034.98919.15419.9670.74514.54319.61817.208-5.19310.34613.9824.878-13.395-7.9296.51811.841-18.1621.40412.2655.298-12.808-3.109-0.749-7.444-21.391
us-gaap:ProfitLoss █▄▄▅▃▂▁▃▄▂▃▆▂▃▆▃▃▁▂▃60.98123.36123.91429.40415.881.902-5.54916.2724.3764.88815.29940.7761.2339.95436.56814.78815.777-7.4071.58412.94NANANANANANANANA17.208-5.193NANA4.878-13.395-7.9296.51811.841-18.1621.40412.2655.451-12.787-3.117-0.585-7.348-21.371
us-gaap:ShareBasedCompensation █▅▆▇▇▅▅▅▇▄▅▆▃▄▄▃▄▄▃▄▆▃▃▅▆▃▃▃▅▃▄▂▂▂▂▂▄▃▂▃▅▃▃▄▁▂3.3242.3542.5222.8852.892.1812.2552.4092.8012.0582.2282.6411.6741.871.8881.4711.8681.7311.4371.9512.4911.7091.6862.112.5861.6471.6361.6942.11.5681.9151.0941.1821.3031.3571.3691.91.4421.3341.4172.2531.4461.4992.0330.8431.315
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▄▄█▄▁▄▂▃▃▂▃▃▄▃▃▄▄▃▂-10.5941.074-5.07878.3411.349-67.151-7.699-36.901-27.689-25.952-36.644-18.261-33.589-6.456-20.158-22.458-12.734-13.119-18.496-41.673NANANANANANANANANANANANANANANANANANANANA-9.763-5.941NANA8.76218.596
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▅▃▇▂▃▃▆██▅▂▅▅▃▆▅▅▄▇▆▄▄▇▆▅▅▄▃▃▃▄▂▂▂▂▄▅▁▆▄▅▁▃▁▁▁15.8079.58823.1023.9379.4716.73821.18227.86426.36615.5434.74314.48617.5867.17721.40417.25414.8512.27322.49719.69212.72513.35724.78119.43917.65916.54611.7278.1866.9168.65413.2914.445.1983.445.35513.52216.0132.38821.113.36116.182.5867.10.9231.3072.092
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▅▅▁▅█▅▅▅▅▅▅▅▅▅▅▅▅▅▅-51.695-26.02-13.336-286.185-6.162194.278-6.581-18.534-12.821-22.464-32.374-17.625-19.545-21.439-21.678-18.092-17.477-20.669-20.217-15.749NANANANANANANANANANANANANANANANANANANANA-1.673-3.499NANA-2.454-3.007
us-gaap:RepaymentsOfLongTermDebt ▂▁▁█▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▃▁▁▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▁▁▁37.25617.38716.458280.45514.58714.59815.16513.78914.76715.21721.29316.27317.13616.55816.66217.31417.65117.29715.62313.75211.76111.0668.6777.5817.30177.25412.41611.4968.7637.76511.4019.76611.05410.95530.39410.3036.2286.0755.173.8923.5513.4432.912.1561.5821.429
us-gaap:PaymentsOfDividendsCommonStock ███████████████████████▅▅▅▆▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁2.0582.0372.0352.042.0492.0332.0422.0432.052.0522.0682.062.0582.0582.0572.0632.0782.0662.0692.0742.0872.0882.0971.5781.5781.5841.6440.8230.8160.8190.8150.8050.8060.8070.8070.8070.8080.7970.7970.7980.7970.7880.7860.7860.7770.777
us-gaap:PaymentsForRepurchaseOfCommonStock ▆▂▂▃▁▃▃▂▃▃█▁▁▁▁▃7.0991.0010.9282.5050.03.1622.9950.9442.5082.6639.2030.00.00.2010.02.408NANA1.9162.4782.5142.6022.7614.0223.5232.459NANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value293000.0291000.0290000.0290000.0290000.0288000.0288000.0288000.0288000.0287000.0287000.0285000.0285000.0285000.0285000.0285000.0285000.0282000.0282000.0281000.0281000.0280000.0279000.0279000.0278000.0277000.0277000.0277000.0277000.0275000.0275000.0274000.0274000.0273000.0273000.0273000.0273000.0271000.0271000.0271000.0271000.0270000.0269000.0267000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Shares Issued

us-gaap:SharesIssued us-gaap:StatementEquityComponents

us-gaap:SharesIssued

us-gaap:CommonStock


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value29292929282828282828282828282828282828282827272727272727272727272727272727272727272626262626
Percentage of SharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockCommon


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-31
Value3.7833.6723.6573.6323.5553.5553.4053.33.2663.1723.0982.8572.8572.8572.8522.8522.762.5652.5652.52.081.6781.678
Percentage of SharesIssued12.912.612.612.512.312.311.811.511.311.110.810.010.010.010.010.09.79.19.18.97.46.16.1

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value26262626262625262626262626262626262526262625262626262626262525252525252525252525252525252525
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value25252525252525252525252525252525252525252525252626262626262525252525252525252525252525252525
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.380.920.941.150.620.07-0.220.640.950.190.591.580.050.391.420.570.61-0.290.060.50.39-0.240.190.730.760.030.530.720.63-0.20.380.520.18-0.52-0.310.240.44-0.710.050.460.2-0.51-0.12-0.03-0.3-0.85
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.270.870.891.110.610.07-0.220.620.920.180.571.520.050.371.370.560.6-0.290.060.490.39-0.240.190.720.740.030.530.720.63-0.20.380.520.18-0.52-0.310.240.44-0.710.050.460.2-0.51-0.12-0.03-0.3-0.85
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value6124263016-0.5652.28421246.73823353.46914381416-6.7976.606159.115-8.3345.0771223-0.4349.7651718-7.947161834-11.664-12.0958.30813-16.439-23.802126.402-11.6981.4910.599-6.51
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.52.93.23.82.6-0.10.32.73.20.93.14.40.42.05.42.02.3-1.01.02.11.3-1.30.81.83.4-0.11.52.52.7-1.42.92.96.0-2.2-2.31.42.6-3.7-5.12.51.3-2.70.30.1-1.6

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value874797786755606693728756736703737770790687694719695663687693659630640675662611646678631586565602568544548565503463461489489456447447422395
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax92.296.196.395.096.798.9101.696.095.498.895.293.299.698.297.796.796.6101.999.897.197.5101.598.995.395.299.897.395.495.9101.597.796.798.5104.5102.197.998.6105.299.695.998.2105.1101.5100.4102.6109.8

us-gaap:CostsAndExpenses us-gaap:ConsolidationItems

arcb:EliminationsAndReconcilingItems


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-28.277-31.426-36.003-32.033-27.911-26.476-26.548-27.655-16.927-12.461-11.26-9.899-7.707-6.443-1.94-2.556-2.628-2.27926-9.279-2.264-2.31126-11.428
Percentage of CostsAndExpenses-3.2-3.9-4.6-4.2-4.6-3.8-3.6-3.7-2.3-1.8-1.5-1.3-1.0-0.9-0.3-0.4-0.4-0.33.9-1.3-0.3-0.44.1-1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.0-3.8-4.4-4.0-4.4-3.8-3.7-3.5-2.2-1.8-1.5-1.2-1.0-0.9-0.3-0.3-0.4-0.43.9-1.3-0.3-0.44.0-1.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arcb:EliminationsAndReconcilingItems82.881.50.092.391.284.00.087.080.460.20.065.760.854.60.030.239.835.70.069.039.464.80.087.4

us-gaap:CostsAndExpenses us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arcb:ArcbestSegment


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value255244240212150166210197179171187195196178177188170151174164152142
Percentage of CostsAndExpenses29.230.630.628.124.724.028.926.124.324.425.425.424.826.025.626.124.522.925.423.823.122.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.929.429.526.723.923.729.425.123.224.124.223.724.725.525.025.323.623.325.423.122.522.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments arcb:ArcbestSegment94.496.70.097.899.1100.90.098.898.899.00.095.198.198.30.096.196.799.40.096.398.6100.0

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value588526526525439502492533523492512535555468479495492474474490468448
Percentage of CostsAndExpenses67.366.067.069.572.372.467.670.671.170.069.569.570.368.269.068.870.871.569.170.871.071.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax62.163.564.566.170.071.668.767.867.969.266.164.870.167.067.466.668.472.969.068.869.372.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments arcb:AssetBasedSegment90.294.60.093.595.497.40.094.493.597.30.091.499.497.20.095.895.7102.20.096.596.4102.0

us-gaap:OperatingSegments, arcb:FleetnetSegment


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value58585549455151525051494945463938353937384142
Percentage of CostsAndExpenses6.77.37.06.67.57.47.17.06.97.46.76.45.86.75.75.45.15.95.55.66.26.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.27.06.76.27.37.37.26.76.67.36.46.05.86.65.55.25.06.05.45.56.16.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments arcb:FleetnetSegment98.198.30.098.098.398.00.097.898.097.20.097.897.896.80.097.898.097.60.099.798.697.7

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value73313039202.385-12.02723336.59620530.7348.991162424-12.6471.0962016-9.7456.86732320.912193227-8.95513217.865
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.73.83.74.93.30.3-1.73.04.40.92.76.50.11.32.33.23.4-1.90.22.92.4-1.61.14.54.70.13.04.64.2-1.52.43.41.4

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value127.9866.2859.7744.8540.483-6.4787.0729.1841.7085.37113-0.499-0.963-20.5489.288.358-5.24-0.4887.6156.15-3.6421.87812120.1675.0971210-3.7623.5497.0222.987-9.908-4.3875.258-5.757-4.3740.536.8083.169-7.346-3.454-0.385-4.079-13.458
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.00.81.20.80.1-0.90.91.20.20.71.6-0.1-0.1-2.91.21.2-0.8-0.11.10.9-0.60.31.81.90.00.81.81.5-0.70.61.10.5-1.9-0.80.9-1.1-1.00.11.30.6-1.7-0.8-0.1-1.0-3.7

Income Taxes Paid

us-gaap:IncomeTaxesPaid us-gaap:IncomeTaxAuthority

us-gaap:IncomeTaxesPaid

arcb:DomesticStateAndLocalJurisdiction


Income
Period End2021-03-31
Value6.5
Percentage of IncomeTaxesPaid100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arcb:DomesticStateAndLocalJurisdiction0.0

Interest And Debt Expense

us-gaap:InterestAndDebtExpense

us-gaap:InterestAndDebtExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2.2742.4282.5122.863.3782.9472.8742.92.8112.8822.9262.472.0132.0591.9321.7061.3891.3151.3761.2961.2311.2471.2171.1571.0251.0020.8230.8340.7250.8080.9040.9931.0791.207
Percentage of InterestAndDebtExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.30.30.40.50.40.40.40.40.40.40.30.30.30.30.20.20.20.20.20.20.20.20.20.10.20.10.10.10.10.20.20.20.2

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value60232329151.902-5.54916244.88815401.2339.954361415-7.4071.5841210-6.1034.98919190.745141917-5.19310134.878-13.395-7.9296.51811-18.1621.404125.298-12.808-3.109-0.749-7.444-21.391
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.82.93.72.50.3-0.82.13.20.72.04.90.21.45.12.02.2-1.10.21.81.5-1.00.82.72.90.12.22.82.6-0.91.82.20.8-2.6-1.51.12.3-4.10.32.41.1-2.9-0.7-0.2-1.8-5.9

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value602329151.90216244.88815401.2339.954361415-7.4071.5841210-6.1034.98819190.745141917-5.19310134.878-13.395-7.9296.51811-18.1621.404125.298-12.808
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.83.72.50.32.13.20.72.04.90.21.45.12.02.2-1.10.21.81.5-1.00.82.72.90.12.22.82.6-0.91.82.20.8-2.6-1.51.12.3-4.10.32.41.1-2.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value60232329151.901-5.54316244.87915401.2299.924361415-7.4241.5781210-6.1214.95618190.726131816-5.2329.869134.663-13.433-7.9656.20911-18.1961.346115.085-12.838-3.139-0.77-7.444
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.82.93.72.50.3-0.82.13.20.72.04.90.21.45.12.02.2-1.10.21.81.5-1.00.82.72.80.12.12.62.5-0.91.72.10.8-2.6-1.51.12.2-4.10.32.31.0-3.0-0.7-0.2-1.8

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value60232329151.901-5.54216244.87915401.2299.925361415-7.4241.5781210-6.1214.95518190.726131816-5.2329.869134.663-13.433-7.9656.20911-18.1961.346115.085-12.838-3.139-0.77-7.444
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.82.93.72.50.3-0.82.13.20.72.04.90.21.45.12.02.2-1.10.21.81.5-1.00.82.72.80.12.12.62.5-0.91.72.10.8-2.6-1.51.12.2-4.10.32.31.0-3.0-0.7-0.2-1.8

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value74323039207.819-11.22931358.59137563.15612162424-12.2531.2112016-9.2657.31233331.28183226-8.70213208.417-23.35-11.016127.201-22.9871.635218.998-21.992-6.694-1.776-10.81-35.266
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.83.93.75.03.31.1-1.64.04.61.24.86.80.41.82.33.33.4-1.90.22.92.5-1.51.14.74.80.22.74.64.1-1.52.33.31.5-4.5-2.12.11.4-5.20.44.11.8-5.1-1.5-0.4-2.6-9.8

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

arcb:EliminationsAndReconcilingItems


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-5.877-7.152-3.179-2.682-2.696-5.052-6.403-4.137-4.126-8.242-7.237-5.176-4.961-5.363-6.521-5.898-3.971-4.103-4.515-4.17-3.487-1.258-3.21-1.648
Percentage of OperatingIncomeLoss-7.9-22.2-10.5-6.7-13.2-64.657.0-13.3-11.7-95.9-19.5-9.2-157.2-42.1-39.1-24.2-16.133.5-372.8-20.5-20.913.6-43.9-4.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.6-0.9-0.4-0.3-0.4-0.7-0.9-0.5-0.5-1.2-0.9-0.6-0.6-0.8-0.9-0.8-0.6-0.6-0.7-0.6-0.5-0.2-0.5-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arcb:EliminationsAndReconcilingItems17.218.50.07.78.816.00.013.019.639.80.034.339.245.40.069.860.264.30.031.060.635.20.012.6

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arcb:ArcbestSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value158.2654.934.8311.303-1.409-26.4932.4522.1221.736.7239.9933.7073.1654.4817.6055.8140.901-1.5866.2692.1730.008
Percentage of OperatingIncomeLoss20.425.716.312.16.4-18.0235.97.96.020.118.117.8117.524.926.931.223.5-7.4-131.030.813.0-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.00.60.60.2-0.2-3.70.30.30.20.91.20.50.50.61.00.80.1-0.20.90.30.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments arcb:ArcbestSegment5.63.30.02.20.9-0.90.01.21.21.00.04.91.91.70.03.93.30.60.03.71.40.0

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6330273621132031361336503.38113172122-10.0257.1481817-8.999
Percentage of OperatingIncomeLoss86.093.492.492.1103.0169.3-183.0101.6102.8158.599.489.5107.1105.3107.889.489.681.8590.388.6104.397.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.73.63.44.63.41.92.94.04.71.94.86.10.41.92.52.93.1-1.51.02.52.6-1.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments arcb:AssetBasedSegment9.85.40.06.54.62.60.05.66.52.70.08.60.62.80.04.24.3-2.20.03.53.6-2.0

us-gaap:OperatingSegments, arcb:FleetnetSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.1381.0230.5580.9870.7821.041.1211.1711.0261.4880.7471.0881.0291.5210.7470.8730.730.9740.7240.1210.5960.984
Percentage of OperatingIncomeLoss1.53.21.82.53.813.3-10.03.82.917.32.01.932.612.04.53.63.0-7.959.80.63.6-10.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.20.10.10.20.10.10.10.20.10.10.10.10.10.00.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments arcb:FleetnetSegment1.91.70.02.01.72.00.02.22.02.80.02.22.23.20.02.22.02.40.00.31.42.3

Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value166000.0575000.0253000.0136000.0-174000.0-997000.0191000.0-338000.0-528000.0-332000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.10.00.0-0.0-0.10.0-0.0-0.1-0.0

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value612000.0329000.0927000.0697000.0457000.0-1420000.0241000.0-35000.0116000.0225000.0-516000.0127000.0-220000.0-72000.0-154000.0294000.0-208000.0119000.0223000.0-420000.0-135000.0584000.0-160000.0-354000.097000.0-295000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.10.10.1-0.20.0-0.00.00.0-0.10.0-0.0-0.0-0.00.0-0.00.00.0-0.1-0.00.1-0.0-0.00.0-0.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1111000.01192000.01965000.01500000.02696000.0-3862000.0485000.0-6734000.0-445000.0-591000.0-15120000.0-714000.0-1123000.0-2201000.0884000.01079000.0505000.0647000.0916000.01091000.0571000.0366000.0369000.0-613000.0197000.0400000.02163000.0234000.0950000.0365000.01115000.01328000.0366000.01083000.0-76000.0997000.0-220000.01340000.01074000.0-1345000.0281000.02610000.0848000.01346000.0-457000.0668000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.20.20.4-0.60.1-0.9-0.1-0.1-2.0-0.1-0.1-0.30.10.10.10.10.10.20.10.10.1-0.10.00.10.30.00.10.10.20.20.10.2-0.00.2-0.00.30.2-0.30.10.60.20.3-0.10.2

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value60232329151.902-5.54916244.88815401.2339.954361415-7.4071.5841217-5.1934.878-13.395-7.9296.51811-18.1621.404125.451-12.787-3.117-0.585-7.348-21.371
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.82.93.72.50.3-0.82.13.20.72.04.90.21.45.12.02.2-1.10.21.82.6-0.90.8-2.6-1.51.12.3-4.10.32.41.1-2.9-0.7-0.1-1.8-5.9

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value948829816794627701717787771711774826793700710744720651688713676621648709696613664711658577578623576520537577510440463510498434441445411359
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems

arcb:EliminationsAndReconcilingItems


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-34.154-38.578-39.182-34.715-30.607-31.528-32.951-31.792-21.053-20.703-18.497-15.075-12.668-11.806-8.461-8.454-6.599-6.38221-13.449-5.751-3.56922-13.076
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.6-4.7-4.8-4.4-4.9-4.5-4.6-4.0-2.7-2.9-2.4-1.8-1.6-1.7-1.2-1.1-0.9-1.03.2-1.9-0.8-0.63.5-1.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.6-4.7-4.8-4.4-4.9-4.5-4.6-4.0-2.7-2.9-2.4-1.8-1.6-1.7-1.2-1.1-0.9-1.03.2-1.9-0.8-0.63.5-1.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arcb:EliminationsAndReconcilingItems100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IntersegmentElimination


Revenue
Period End2021-03-312020-03-31
Value-39.392-32.507
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.8-4.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.8-4.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination, arcb:ArcbestSegment


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value-2.71-2.095-1.784-1.827
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.3-0.3-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.3-0.3-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination arcb:ArcbestSegment100.0100.0100.0100.0

us-gaap:IntersegmentElimination, arcb:AssetBasedSegment


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value-22.687-26.568-20.485-19.985
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.4-3.2-3.3-2.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.4-3.2-3.3-2.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination arcb:AssetBasedSegment100.0100.0100.0100.0

us-gaap:IntersegmentElimination, arcb:FleetnetSegment


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value-9.596-10.729-9.195-10.695
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.0-1.3-1.5-1.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.0-1.3-1.5-1.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination arcb:FleetnetSegment100.0100.0100.0100.0

us-gaap:IntersegmentElimination, us-gaap:CorporateAndOther


Revenue
Period End2021-06-302020-06-30
Value-34.993-31.464
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.7-5.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.7-5.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination us-gaap:CorporateAndOther100.0100.0

us-gaap:OperatingSegments, arcb:ArcbestSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value270252245217151164184199181173193205199181182195175152172170154142
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.530.430.127.324.123.525.725.423.524.325.024.925.226.025.626.324.423.525.124.022.822.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.530.430.127.324.123.525.725.423.524.325.024.925.226.025.626.324.423.525.124.022.822.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments arcb:ArcbestSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value652556554561460515513565559506548585559482497517514464482509486439
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax68.867.167.970.773.373.571.671.872.571.170.970.870.568.969.969.571.471.370.071.371.970.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax68.867.167.970.773.373.571.671.872.571.170.970.870.568.969.969.571.471.370.071.371.970.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments arcb:AssetBasedSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, arcb:FleetnetSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value59595550465252535153505046474039364038394143
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.37.16.86.47.47.57.46.96.77.56.56.15.96.85.65.35.16.25.65.56.27.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.37.16.86.47.47.57.46.96.77.56.56.15.96.85.65.35.16.25.65.56.27.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments arcb:FleetnetSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

arcb:ArcbestSegment


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value268250149162
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.230.223.923.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.230.223.923.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arcb:ArcbestSegment100.0100.0100.0100.0

arcb:AssetBasedSegment


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value630529439495
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax66.463.970.170.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax66.463.970.170.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arcb:AssetBasedSegment100.0100.0100.0100.0

arcb:FleetnetSegment


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value49483741
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.35.85.96.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.35.85.96.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arcb:FleetnetSegment100.0100.0100.0100.0

us-gaap:CorporateAndOther


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.8390.8140.8570.979
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateAndOther100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value948829816794627701717787771711774826793700710744720651688713676621648709696613664711658577578623576520537577510440463510498434441445411359
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1841176817791746187018341651167016331559153915171432135813651344131212441309132012831245126212441192114111271140108510211017103810241011103410801067887916908887857860869
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1841176817791746187018341651167016331559153915171432135813651344131212441309132012831245126212441192114111271140108510211017103810241011103410801067887916908887857860869
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value898851828802775759763763743721717705668665651613602591598595582577588586579557560551532514520499481447458470462449465488476469479500624632
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets48.848.246.646.041.441.446.245.745.546.346.646.546.749.047.745.645.947.545.745.145.446.446.647.248.648.949.748.349.150.351.248.147.044.344.443.643.350.750.853.853.754.755.757.60.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value3.063.163.261.8831.9932.1022.152-5.249-10.421-10.792-12.749-22.357-17.285-19.398-19.715-21.116-20.622-21.53-21.886-26.039-28.601-27.766-25.497-25.338-19.54-22.907-22.387-18.04-16.321-14.386
Percentage of StockholdersEquity0.30.40.40.20.30.30.3-0.7-1.4-1.5-1.8-3.2-2.6-2.9-3.0-3.4-3.4-3.6-3.7-4.4-4.9-4.8-4.3-4.3-3.4-4.1-4.0-3.3-3.1-2.8
Percentage of Assets0.20.20.20.10.10.10.1-0.3-0.6-0.7-0.8-1.5-1.2-1.4-1.4-1.6-1.6-1.7-1.7-2.0-2.2-2.2-2.0-2.0-1.6-2.0-2.0-1.6-1.5-1.4
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-0.457-0.623-1.198-1.451-1.587-1.413-0.416-0.607-0.2690.2590.591
Percentage of StockholdersEquity-0.1-0.1-0.1-0.2-0.2-0.2-0.1-0.1-0.00.00.1
Percentage of Assets-0.0-0.0-0.1-0.1-0.1-0.1-0.0-0.0-0.00.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value2.6721.9941.19-1.367-2.09-2.2640.203-7.63-12.429-12.388-14.238-22.62-17.842-20.078-20.574-22.201-22.026-22.807-23.417-28.439-30.843-29.727-27.496-27.585-20.95-24.658-23.479-18.7-16.783-17.666-14.912-21.47-25.733-55.641-57.372-53.206-54.996-56.679-58.402-33.196-33.839-34.943-36.053-44.212-57.507-26.523
Percentage of StockholdersEquity0.30.20.1-0.2-0.3-0.30.0-1.0-1.7-1.7-2.0-3.2-2.7-3.0-3.2-3.6-3.7-3.9-3.9-4.8-5.3-5.1-4.7-4.7-3.6-4.4-4.2-3.4-3.2-3.4-2.9-4.3-5.3-12.4-12.5-11.3-11.9-12.6-12.5-6.8-7.1-7.4-7.5-8.8-9.2-4.2
Percentage of Assets0.10.10.1-0.1-0.1-0.10.0-0.5-0.8-0.8-0.9-1.5-1.2-1.5-1.5-1.7-1.7-1.8-1.8-2.2-2.4-2.4-2.2-2.2-1.8-2.2-2.1-1.6-1.5-1.7-1.5-2.1-2.5-5.5-5.5-4.9-5.2-6.4-6.4-3.7-3.8-4.1-4.2-5.10.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value0.069-0.543-0.872-1.799-2.496-2.953-1.533-1.774-1.739-1.855-2.08-1.564-1.691-1.471-1.151-0.997-1.291-1.083-1.202-1.425-1.005-0.87-1.454-1.294-0.94-1.037-0.742-0.66-0.462-0.526
Percentage of StockholdersEquity0.0-0.1-0.1-0.2-0.3-0.4-0.2-0.2-0.2-0.3-0.3-0.2-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1
Percentage of Assets0.0-0.0-0.0-0.1-0.1-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value338344342339337336333331329327325325322321319317316316314313311311309307307304303301299298296291290290289288287287286284284283281274268258
Percentage of StockholdersEquity37.740.441.342.343.644.343.843.444.345.445.446.248.348.349.051.852.553.552.652.753.653.952.652.553.154.654.054.756.358.156.958.360.365.063.161.362.264.061.558.359.860.358.654.843.040.9
Percentage of Assets18.419.519.219.518.118.320.219.920.221.021.221.422.523.723.423.624.125.524.023.824.325.024.524.725.826.726.926.427.629.229.128.128.328.728.026.727.032.431.331.432.133.032.731.60.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value0.2930.2910.290.290.290.2880.2880.2880.2880.2870.2870.2850.2850.2850.2850.2850.2850.2820.2820.2810.2810.280.2790.2790.2780.2770.2770.2770.2770.2750.2750.2740.2740.2730.2730.2730.2730.2710.2710.2710.2710.270.2690.2670.2670.265
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value676617595574546532533540526504501488449450438403391377387387376368376373356337338325307290296287274269284292287276295294283278292327471457
Percentage of StockholdersEquity75.372.571.971.570.570.269.970.870.969.969.969.267.267.767.365.865.063.864.665.164.763.964.063.761.560.660.459.157.756.557.057.557.060.361.962.262.161.463.460.359.459.360.965.575.472.4
Percentage of Assets36.734.933.532.929.229.032.332.432.232.332.632.231.433.232.130.029.830.329.629.329.429.629.830.129.929.630.028.628.328.529.227.726.726.727.527.126.931.132.232.431.932.533.937.70.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStockCommon


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-31
Value-119.273-112.174-111.173-110.245-107.74-107.74-104.578-101.583-100.639-98.131-95.468-86.265-86.265-86.265-86.064-86.064-83.656-80.045-80.045-78.129-70.535-57.77-57.77
Percentage of StockholdersEquity-13.3-13.2-13.4-13.7-13.9-14.2-13.7-13.3-13.5-13.6-13.3-12.2-12.9-13.0-13.2-14.0-13.9-13.5-13.4-13.1-12.0-10.3-11.1
Percentage of Assets-6.5-6.3-6.2-6.3-5.8-5.9-6.3-6.1-6.2-6.3-6.2-5.7-6.0-6.4-6.3-6.4-6.4-6.4-6.1-5.9-5.6-5.1-5.7
Percentage of Assets us-gaap:TreasuryStockCommon0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value843768758730902869664657651606649631590532522519501464521532547533552580561529514524477432418434405378386408398430445445434409399384
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets45.843.542.641.848.247.440.239.439.938.942.241.641.239.238.238.638.237.339.840.342.742.943.746.747.146.345.746.044.042.441.141.939.637.437.337.837.448.548.649.049.047.746.444.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value36230130326740635220118318113819017715912412010910282114130152134164191192166157159129951051078875907153138141137114861029980493910093
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.717.117.115.321.719.212.211.011.18.912.411.711.19.28.88.17.86.68.79.911.910.813.115.416.114.513.914.011.99.410.410.48.67.48.86.65.015.615.415.112.910.111.90.00.00.04.50.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:InvestmentType

us-gaap:Cash


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value284236240236353224166159145104124126106938667646192102928711014699
Percentage of CashAndCashEquivalentsAtCarryingValue78.478.479.288.587.063.782.586.680.175.865.771.467.174.671.661.662.574.281.078.760.865.266.876.563.4
Percentage of Assets15.413.413.513.618.912.210.19.58.96.78.18.37.56.86.35.04.94.97.17.87.27.18.711.88.8
Percentage of Assets us-gaap:Cash0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:MoneyMarketFunds


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value4936341638113209.942211842323713142225205.7037.8033927241541
Percentage of CashAndCashEquivalentsAtCarryingValue13.511.911.36.29.432.110.25.411.913.422.318.523.411.112.020.424.625.15.06.026.120.115.18.026.2
Percentage of Assets2.72.01.90.92.06.21.20.61.31.22.82.22.61.01.11.71.91.70.40.63.12.22.01.23.6
Percentage of Assets us-gaap:MoneyMarketFunds0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:VariableRateDemandObligation


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value29292914141414141414191715171919130.57816191919292916
Percentage of CashAndCashEquivalentsAtCarryingValue8.19.79.65.33.74.27.38.08.010.810.410.19.414.316.318.012.90.714.115.313.114.718.115.510.4
Percentage of Assets1.61.61.60.80.80.80.90.90.91.01.31.21.11.31.41.51.00.01.21.51.61.62.42.41.4
Percentage of Assets us-gaap:VariableRateDemandObligation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-31
Value36230130326740635220118318113819017715912412010910283115131166158
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.717.117.115.321.719.212.211.011.18.912.411.711.19.28.88.17.86.78.89.913.214.0

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value59596583167178116124117116106756854565754565659646961695345454336353528292929474645333037423993
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.33.43.74.89.09.77.17.47.27.56.95.04.74.04.14.24.14.64.34.55.05.64.95.64.54.04.13.83.33.53.52.82.93.02.84.44.45.13.73.44.24.94.610.8

us-gaap:ShortTermInvestments us-gaap:InvestmentType

us-gaap:CertificatesOfDeposit


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value5959535913113169758183827568545657545656596469616945
Percentage of ShortTermInvestments100.0100.081.571.078.473.559.560.569.471.877.7100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.33.43.03.47.07.24.24.55.05.35.45.04.74.04.14.24.14.64.34.55.05.64.95.64.1
Percentage of Assets us-gaap:CertificatesOfDeposit0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:USTreasurySecurities


Short
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value122436474749353223
Percentage of ShortTermInvestments18.529.021.626.540.539.530.628.222.3
Percentage of Assets0.71.41.92.62.92.92.22.11.5
Percentage of Assets us-gaap:USTreasurySecurities0.00.00.00.00.00.00.00.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value360344320323273278282292296294297323309289279301282258260256238226236242245230228243236221202212206190180209201150149165170161145115
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.619.518.018.514.615.217.117.518.118.919.321.321.621.320.422.521.620.819.919.418.618.218.719.520.620.220.221.321.821.719.920.520.118.817.519.418.916.916.318.219.218.916.913.3

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4.9374.8934.4225.2354.9234.464.7455.2854.9824.4669.0079.0389.5099.029128.8348.2938.2264.34.2755.225.0123.9365.1445.0724.9074.9687.4898.1368.1446.9528.8827.3067.2887.1858.5999.8055.9586.1865.2515.2215.7655.6774.333
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.20.30.30.20.30.30.30.30.60.60.70.70.90.70.60.70.30.30.40.40.30.40.40.40.40.70.70.80.70.90.70.70.70.80.90.70.70.60.60.70.70.5

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1704167816711665163516251632162815991555154515311487145914561419139613611351135213191285127112491204117111611146112710981094109110871080107910831077100610071000981963960934
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets92.694.993.995.487.488.698.997.597.999.8100.4100.9103.9107.4106.6105.6106.4109.4103.2102.4102.8103.2100.7100.4101.0102.7103.0100.6103.9107.5107.6105.1106.1106.9104.3100.3101.0113.4110.0110.2110.5112.4111.5107.5

Leasehold Improvements Gross

us-gaap:LeaseholdImprovementsGross

us-gaap:LeaseholdImprovementsGross


Leasehold
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1515151411111010109.7669.3659.1779.1318.9488.8889.2289.0088.9932727252525242424242323232323232323222321212121222121
Percentage of LeaseholdImprovementsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.90.90.80.60.60.60.60.60.60.60.60.60.70.70.70.70.72.12.02.02.12.02.02.12.12.22.12.22.32.32.32.32.32.22.12.22.52.32.32.42.62.52.5

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10381015992987974961949948947932913904896884865850841838819822812802788790779766752735724713700691673653635622614605592590582569552505
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets56.457.555.856.552.152.457.556.858.059.859.459.662.665.263.363.264.167.362.562.363.364.562.463.565.467.166.764.466.869.868.866.665.764.661.457.757.668.264.665.065.766.364.258.1

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value960000.0967000.01070000.0983000.0978000.0981000.01002000.01116000.01121000.01128000.01127000.01130000.01130000.01134000.01134000.01133000.01135000.01136000.01180000.01100000.01000000.0987000.0923000.0900000.01100000.01148000.01110000.01100000.01100000.01043000.01044000.01000000.01100000.01043000.01043000.01018000.0
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value665662678678660663683680651622631626591574591569555523532529507482483458424405409411402384394399414427444460462401415410398394407428
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.237.538.138.835.336.241.440.739.939.941.041.341.342.343.342.442.342.140.740.139.538.838.236.935.635.536.336.137.137.638.838.540.442.242.942.643.445.245.345.244.946.047.349.3

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value8688888888888810810810810810810810810810810810810811096969681818077777776767676757379823.73.7
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.75.05.05.14.74.85.36.56.66.97.07.17.68.07.98.18.38.88.38.47.57.87.66.56.87.16.86.87.27.57.57.47.57.47.17.37.70.40.4

us-gaap:Goodwill us-gaap:StatementBusinessSegments

arcb:ArcbestSegment


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value858787878787871071071071071071071071071081081081089576
Percentage of Goodwill99.399.399.399.399.399.399.399.499.499.499.499.499.499.499.499.499.499.499.499.399.2
Percentage of Assets4.75.04.95.04.74.85.36.46.66.97.07.17.57.97.98.18.38.78.37.66.8
Percentage of Assets arcb:ArcbestSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

arcb:FleetnetSegment


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value0.630.60.630.60.60.60.630.60.60.60.630.60.60.60.630.630.630.630.630.630.63
Percentage of Goodwill0.70.70.70.70.70.70.70.60.60.60.60.60.60.60.60.60.60.60.60.70.8
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.00.00.1
Percentage of Assets arcb:FleetnetSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:TradeNames


Indefinite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value32323232323232323232323232323232323232323232323232323232323232323232323231
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.81.81.81.81.71.82.01.92.02.12.12.12.32.42.42.42.52.62.52.42.52.62.62.62.72.82.92.83.03.23.23.13.23.23.13.03.0
Percentage of Assets us-gaap:TradeNames0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value535454565657586566676870717273777879808275767670717272737474757677787980712.822
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.93.13.13.23.03.23.63.94.14.34.54.65.05.35.45.76.06.46.16.25.96.16.15.76.06.46.56.56.97.37.47.47.67.87.77.56.70.3

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value20212223242526333435363738404142434445464041413536373738393940414243444536
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.21.31.41.31.41.62.02.12.32.42.52.72.93.03.13.33.63.53.63.13.33.32.83.03.33.33.43.63.84.04.04.14.34.34.23.4

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value20212223242526333435363738394041424345453940403435363637373738394041414233
Percentage of FiniteLivedIntangibleAssetsNet97.998.098.197.898.198.298.299.299.299.199.199.098.998.998.898.898.798.798.697.598.398.298.197.797.797.196.295.695.996.796.195.695.194.694.193.791.2
Percentage of Assets1.11.21.31.31.31.41.62.02.12.32.42.52.72.93.03.13.33.53.43.53.13.23.22.83.03.23.23.33.53.73.83.83.94.14.03.93.1
Percentage of Assets us-gaap:CustomerRelationships0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value0.4430.4360.4370.5210.4680.4730.4780.2620.2870.3140.3480.3780.4130.4470.4830.5190.5540.590.6261.1730.6990.7370.7750.8130.8490.8890.9270.9660.589
Percentage of FiniteLivedIntangibleAssetsNet2.12.01.92.21.91.81.80.80.80.90.91.01.11.11.21.21.31.31.42.51.71.81.92.32.32.42.52.51.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value109111115112817368676868
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.06.36.56.44.34.04.14.04.24.4

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:PropertyPlantAndEquipmentByType

arcb:EquipmentAndOthers


Operating
Period End2020-12-312019-12-312019-09-302019-06-30
Value0.2871.2431.4981.781
Percentage of OperatingLeaseRightOfUseAsset0.21.82.22.6
Percentage of Assets0.00.10.10.1
Percentage of Assets arcb:EquipmentAndOthers0.00.00.00.0

arcb:LandAndStructures


Operating
Period End2020-12-312019-12-312019-09-302019-06-30
Value114676567
Percentage of OperatingLeaseRightOfUseAsset99.898.297.897.4
Percentage of Assets6.54.13.94.1
Percentage of Assets arcb:LandAndStructures0.00.00.00.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312011-03-312010-12-312009-12-31
Value7676777474737985807874746565646665656665565554535455
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.14.34.44.24.04.04.85.14.95.04.84.94.64.84.75.05.05.35.05.04.44.54.36.36.36.4

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2041771701621401271341601661451431541761391291471421301331491451391301441471151041351211108995948484909467667482696259
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.110.19.69.37.57.08.19.610.29.39.310.212.310.39.511.010.810.510.211.411.311.210.411.612.410.19.211.811.210.88.89.29.28.48.18.48.97.67.38.29.38.17.26.8

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value7.3570.3160.0053.1810.0310.0120.1981.9420.2411.6880.1380.5110.0930.3240.0918.4894.8690.2570.527166.9470.1621.7822.8680.1620.0750.0590.430.220.1080.1695.7870.3480.1290.1960.826
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.00.00.20.00.00.00.10.00.10.00.00.00.00.00.70.40.00.01.50.60.00.20.30.00.00.00.00.00.00.00.60.00.00.00.1

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value260235246249217217228234228211243233221202211202200190190187184176188193187176194187179171173181170167158159163159151156157153144150
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.113.313.914.311.611.913.914.114.013.615.815.415.514.915.515.115.215.314.514.214.414.214.915.615.815.517.316.516.516.817.117.516.616.615.314.815.318.016.617.217.817.916.817.3

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value560500506497439422444465471431451454449398402413405381387399384362364381364329340395360327309326318304299317319267263272272250233236
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.428.328.528.523.523.126.927.928.927.729.330.031.429.429.530.730.930.729.630.230.029.128.930.730.628.930.234.733.232.130.431.531.030.129.029.429.930.228.830.030.729.227.227.2

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value21212120192020181817
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.21.21.21.11.11.21.11.11.1

us-gaap:OperatingLeaseLiabilityCurrent us-gaap:PropertyPlantAndEquipmentByType

arcb:EquipmentAndOthers


Operating
Period End2020-12-312019-12-312019-09-302019-06-30
Value0.2750.9720.9941.023
Percentage of OperatingLeaseLiabilityCurrent1.34.85.45.6
Percentage of Assets0.00.10.10.1
Percentage of Assets arcb:EquipmentAndOthers0.00.00.00.0

arcb:LandAndStructures


Operating
Period End2020-12-312019-12-312019-09-302019-06-30
Value21191717
Percentage of OperatingLeaseLiabilityCurrent98.795.294.694.4
Percentage of Assets1.21.21.01.1
Percentage of Assets arcb:LandAndStructures0.00.00.00.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value12163731232322158.0198.4058.831
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.71.02.42.31.81.82.01.50.80.91.0

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value17120021722647347626624823522723723519819620620019416717917617015716715613613210285827481889610511213213334464538394213
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.311.412.212.925.326.016.114.914.414.615.415.513.814.515.214.914.813.413.713.413.312.613.312.611.511.69.17.57.67.38.08.69.510.410.912.312.53.95.15.14.34.65.01.5

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value64677267606366706155565341484960585054
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.53.84.13.93.23.44.04.23.73.63.73.52.93.63.64.54.44.14.2

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent


Pension
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value18181820202020323131312736363940373735424556514939444237333426385110510493911051066665636567
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.01.01.21.11.11.21.92.02.02.01.82.52.72.93.02.83.02.73.23.64.54.14.03.33.93.83.33.13.42.63.75.110.510.18.78.611.911.67.47.37.47.67.8

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1819282324
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent97.998.390.458.669.3
Percentage of Assets1.01.21.91.71.9
Percentage of Assets us-gaap:DefinedBenefitPostretirementHealthCoverage0.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value0.3920.353.0113.8973.805
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent2.11.79.69.810.6
Percentage of Assets0.00.00.20.30.3
Percentage of Assets us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit0.00.00.00.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3533373536353838373644403812151615151615121212121212161414131513121212121212131317181920
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.91.92.12.01.91.92.42.32.32.32.92.72.70.91.11.21.21.31.31.11.01.01.01.01.01.11.51.31.41.31.51.31.21.21.21.21.21.41.51.52.02.12.32.3

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value92949796655652525454
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.05.35.55.53.53.13.23.23.33.5

us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:PropertyPlantAndEquipmentByType

arcb:EquipmentAndOthers


Operating
Period End2020-12-312019-12-312019-09-302019-06-30
Value0.0110.2690.4970.747
Percentage of OperatingLeaseLiabilityNoncurrent0.00.50.91.4
Percentage of Assets0.00.00.00.0
Percentage of Assets arcb:EquipmentAndOthers0.00.00.00.0

arcb:LandAndStructures


Operating
Period End2020-12-312019-12-312019-09-302019-06-30
Value97525253
Percentage of OperatingLeaseLiabilityNoncurrent100.099.599.198.6
Percentage of Assets5.53.13.13.3
Percentage of Assets arcb:LandAndStructures0.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value18172120201816201917
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.01.21.11.11.01.01.21.21.1

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo us-gaap:PropertyPlantAndEquipmentByType

arcb:EquipmentAndOthers


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.0250.0250.0110.0110.2810.2810.270.9991.01
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo0.10.10.10.11.41.51.65.05.3
Percentage of Assets0.00.00.00.00.00.00.00.10.1
Percentage of Assets arcb:EquipmentAndOthers0.00.00.00.00.00.00.00.00.0

arcb:LandAndStructures


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value181721192018161918
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo99.999.999.999.998.698.598.495.094.7
Percentage of Assets1.01.01.21.11.11.01.01.11.1
Percentage of Assets arcb:LandAndStructures0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value16151615161312151413
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.90.90.90.90.80.70.90.90.9

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree us-gaap:PropertyPlantAndEquipmentByType

arcb:LandAndStructures


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value161516151613121514
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.099.999.9100.098.398.1
Percentage of Assets0.90.90.90.90.90.80.70.90.9
Percentage of Assets arcb:LandAndStructures0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1312141312108.87111109.49
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.80.80.70.60.50.70.60.6

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour us-gaap:PropertyPlantAndEquipmentByType

arcb:LandAndStructures


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1312141312108.8711110
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.80.80.70.60.50.70.6
Percentage of Assets arcb:LandAndStructures0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value12107.8176.2758.0687.556.748
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.50.40.40.50.50.4

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive us-gaap:PropertyPlantAndEquipmentByType

arcb:LandAndStructures


Lessee
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-30
Value12107.8176.2758.0687.55
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.50.40.40.50.5
Percentage of Assets arcb:LandAndStructures0.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value43231613181817
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.41.20.90.81.11.11.1

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:PropertyPlantAndEquipmentByType

arcb:LandAndStructures


Lessee
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-30
Value432316131818
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0100.0100.0100.0
Percentage of Assets2.41.20.90.81.11.1
Percentage of Assets arcb:LandAndStructures0.00.00.00.00.00.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value114116119116857772717272
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.26.66.76.74.54.24.44.34.44.6

us-gaap:OperatingLeaseLiability us-gaap:PropertyPlantAndEquipmentByType

arcb:EquipmentAndOthers


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.060.1270.2860.5110.7591.0171.2411.4911.77
Percentage of OperatingLeaseLiability0.10.10.20.40.91.31.72.12.4
Percentage of Assets0.00.00.00.00.00.10.10.10.1
Percentage of Assets arcb:EquipmentAndOthers0.00.00.00.00.00.00.00.00.0

arcb:LandAndStructures


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1141151191168476716970
Percentage of OperatingLeaseLiability99.999.999.899.699.198.798.397.997.6
Percentage of Assets6.26.66.76.74.54.24.34.24.3
Percentage of Assets arcb:LandAndStructures0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value127128132130948580798080
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.97.37.47.55.04.64.84.74.95.2

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue us-gaap:PropertyPlantAndEquipmentByType

arcb:EquipmentAndOthers


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.0610.1290.2880.5160.7691.0361.2681.5321.826
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue0.00.10.20.40.81.21.61.92.3
Percentage of Assets0.00.00.00.00.00.10.10.10.1
Percentage of Assets arcb:EquipmentAndOthers0.00.00.00.00.00.00.00.00.0

arcb:LandAndStructures


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1271281321309384787778
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.099.999.899.699.298.898.498.197.7
Percentage of Assets6.97.27.47.55.04.64.84.64.8
Percentage of Assets arcb:LandAndStructures0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value121212139.1127.9367.4797.8138.2548.529
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.70.80.50.40.50.50.50.5

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount us-gaap:PropertyPlantAndEquipmentByType

arcb:EquipmentAndOthers


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.0010.0020.0020.0050.010.0190.0270.0410.056
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount0.00.00.00.00.10.20.40.50.7
Percentage of Assets0.00.00.00.00.00.00.00.00.0
Percentage of Assets arcb:EquipmentAndOthers0.00.00.00.00.00.00.00.00.0

arcb:LandAndStructures


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value121212139.1027.9177.4527.7728.198
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.099.999.899.699.599.3
Percentage of Assets0.70.70.70.80.50.40.50.50.5
Percentage of Assets arcb:LandAndStructures0.00.00.00.00.00.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value898851828802775759763763743721717705668665651613602591598595582577588586579557560551532514520499481447458470462449465488476469479500624632
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets48.848.246.646.041.441.446.245.745.546.346.646.546.749.047.745.645.947.545.745.145.446.446.647.248.648.949.748.349.150.351.248.147.044.344.443.643.350.750.853.853.754.755.757.60.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value3.063.163.261.8831.9932.1022.152-5.249-10.421-10.792-12.749-22.357-17.285-19.398-19.715-21.116-20.622-21.53-21.886-26.039-28.601-27.766-25.497-25.338-19.54-22.907-22.387-18.04-16.321-14.386
Percentage of StockholdersEquity0.30.40.40.20.30.30.3-0.7-1.4-1.5-1.8-3.2-2.6-2.9-3.0-3.4-3.4-3.6-3.7-4.4-4.9-4.8-4.3-4.3-3.4-4.1-4.0-3.3-3.1-2.8
Percentage of Assets0.20.20.20.10.10.10.1-0.3-0.6-0.7-0.8-1.5-1.2-1.4-1.4-1.6-1.6-1.7-1.7-2.0-2.2-2.2-2.0-2.0-1.6-2.0-2.0-1.6-1.5-1.4
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-0.457-0.623-1.198-1.451-1.587-1.413-0.416-0.607-0.2690.2590.591
Percentage of StockholdersEquity-0.1-0.1-0.1-0.2-0.2-0.2-0.1-0.1-0.00.00.1
Percentage of Assets-0.0-0.0-0.1-0.1-0.1-0.1-0.0-0.0-0.00.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value2.6721.9941.19-1.367-2.09-2.2640.203-7.63-12.429-12.388-14.238-22.62-17.842-20.078-20.574-22.201-22.026-22.807-23.417-28.439-30.843-29.727-27.496-27.585-20.95-24.658-23.479-18.7-16.783-17.666-14.912-21.47-25.733-55.641-57.372-53.206-54.996-56.679-58.402-33.196-33.839-34.943-36.053-44.212-57.507-26.523
Percentage of StockholdersEquity0.30.20.1-0.2-0.3-0.30.0-1.0-1.7-1.7-2.0-3.2-2.7-3.0-3.2-3.6-3.7-3.9-3.9-4.8-5.3-5.1-4.7-4.7-3.6-4.4-4.2-3.4-3.2-3.4-2.9-4.3-5.3-12.4-12.5-11.3-11.9-12.6-12.5-6.8-7.1-7.4-7.5-8.8-9.2-4.2
Percentage of Assets0.10.10.1-0.1-0.1-0.10.0-0.5-0.8-0.8-0.9-1.5-1.2-1.5-1.5-1.7-1.7-1.8-1.8-2.2-2.4-2.4-2.2-2.2-1.8-2.2-2.1-1.6-1.5-1.7-1.5-2.1-2.5-5.5-5.5-4.9-5.2-6.4-6.4-3.7-3.8-4.1-4.2-5.10.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value0.069-0.543-0.872-1.799-2.496-2.953-1.533-1.774-1.739-1.855-2.08-1.564-1.691-1.471-1.151-0.997-1.291-1.083-1.202-1.425-1.005-0.87-1.454-1.294-0.94-1.037-0.742-0.66-0.462-0.526
Percentage of StockholdersEquity0.0-0.1-0.1-0.2-0.3-0.4-0.2-0.2-0.2-0.3-0.3-0.2-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1
Percentage of Assets0.0-0.0-0.0-0.1-0.1-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value338344342339337336333331329327325325322321319317316316314313311311309307307304303301299298296291290290289288287287286284284283281274268258
Percentage of StockholdersEquity37.740.441.342.343.644.343.843.444.345.445.446.248.348.349.051.852.553.552.652.753.653.952.652.553.154.654.054.756.358.156.958.360.365.063.161.362.264.061.558.359.860.358.654.843.040.9
Percentage of Assets18.419.519.219.518.118.320.219.920.221.021.221.422.523.723.423.624.125.524.023.824.325.024.524.725.826.726.926.427.629.229.128.128.328.728.026.727.032.431.331.432.133.032.731.60.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value0.2930.2910.290.290.290.2880.2880.2880.2880.2870.2870.2850.2850.2850.2850.2850.2850.2820.2820.2810.2810.280.2790.2790.2780.2770.2770.2770.2770.2750.2750.2740.2740.2730.2730.2730.2730.2710.2710.2710.2710.270.2690.2670.2670.265
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value676617595574546532533540526504501488449450438403391377387387376368376373356337338325307290296287274269284292287276295294283278292327471457
Percentage of StockholdersEquity75.372.571.971.570.570.269.970.870.969.969.969.267.267.767.365.865.063.864.665.164.763.964.063.761.560.660.459.157.756.557.057.557.060.361.962.262.161.463.460.359.459.360.965.575.472.4
Percentage of Assets36.734.933.532.929.229.032.332.432.232.332.632.231.433.232.130.029.830.329.629.329.429.629.830.129.929.630.028.628.328.529.227.726.726.727.527.126.931.132.232.431.932.533.937.70.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStockCommon


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-31
Value-119.273-112.174-111.173-110.245-107.74-107.74-104.578-101.583-100.639-98.131-95.468-86.265-86.265-86.265-86.064-86.064-83.656-80.045-80.045-78.129-70.535-57.77-57.77
Percentage of StockholdersEquity-13.3-13.2-13.4-13.7-13.9-14.2-13.7-13.3-13.5-13.6-13.3-12.2-12.9-13.0-13.2-14.0-13.9-13.5-13.4-13.1-12.0-10.3-11.1
Percentage of Assets-6.5-6.3-6.2-6.3-5.8-5.9-6.3-6.1-6.2-6.3-6.2-5.7-6.0-6.4-6.3-6.4-6.4-6.4-6.1-5.9-5.6-5.1-5.7
Percentage of Assets us-gaap:TreasuryStockCommon0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value293000.0291000.0290000.0290000.0290000.0288000.0288000.0288000.0288000.0287000.0287000.0285000.0285000.0285000.0285000.0285000.0285000.0282000.0282000.0281000.0281000.0280000.0279000.0279000.0278000.0277000.0277000.0277000.0277000.0275000.0275000.0274000.0274000.0273000.0273000.0273000.0273000.0271000.0271000.0271000.0271000.0270000.0269000.0267000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value338344342339337336333331329327325325322321319317316316314313311311309307307304303301299298296291290290289288287287286284284283281274
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.419.519.219.518.118.320.219.920.221.021.221.422.523.723.423.624.125.524.023.824.325.024.524.725.826.726.926.427.629.229.128.128.328.728.026.727.032.431.331.432.133.032.731.6

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value676617595574546532533540526504501488449450438403391377387387376368376373356337338325307290296287274269284292287276295294283278292327
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.734.933.532.929.229.032.332.432.232.332.632.231.433.232.130.029.830.329.629.329.429.629.830.129.929.630.028.628.328.529.227.726.726.727.527.126.931.132.232.431.932.533.937.7

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2672000.01994000.01190000.0-1367000.0-2090000.0-2264000.0203000.0-7630000.0-12429000.0-12388000.0-14238000.0-22620000.0-17842000.0-20078000.0-20574000.0-22201000.0-22026000.0-22807000.0-23417000.0-28439000.0-30843000.0-29727000.0-27496000.0-27585000.0-20950000.0-24658000.0-23479000.0-18700000.0-16783000.0-17666000.0-14912000.0-21470000.0-25733000.0-55641000.0-57372000.0-53206000.0-54996000.0-56679000.0-58402000.0-33196000.0-33839000.0-34943000.0-36053000.0-44212000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.1-0.1-0.1-0.10.0-0.5-0.8-0.8-0.9-1.5-1.2-1.5-1.5-1.7-1.7-1.8-1.8-2.2-2.4-2.4-2.2-2.2-1.8-2.2-2.1-1.6-1.5-1.7-1.5-2.1-2.5-5.5-5.5-4.9-5.2-6.4-6.4-3.7-3.8-4.1-4.2-5.1

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3.3242.3542.8852.892.1812.4092.8012.0582.2282.6411.6741.871.8881.4711.8681.7311.4371.9512.4911.7091.6862.112.5861.6471.6361.6942.11.5681.9151.0941.1821.3031.3571.3691.91.4421.3341.4173.6991.446
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3.3242.3542.8852.892.1812.4092.8012.0582.2282.6411.6741.871.8881.4711.8681.7311.4371.9512.4911.7091.6862.112.5861.6471.6361.6942.11.5681.9151.0941.1821.3031.3571.3691.91.4421.3341.4172.2531.446
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.060.9100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302011-06-302011-03-312010-06-302010-03-31
Value1232254695823325783-3.371815487315347491.761223539-6.35424-5.675
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.02.76.78.79.43.34.57.310.9-0.510.66.511.14.57.56.36.90.33.35.07.9-1.56.1-1.6

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302011-06-302011-03-312010-06-302010-03-31
Value-10.5941.074-5.078781.349-67.151-7.699-36.901-27.689-25.952-36.644-18.261-33.589-6.456-20.158-22.458-12.734-13.119-18.496-41.673-9.763-5.9418.76218
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.10.1-0.69.90.2-9.6-1.1-4.7-3.6-3.6-4.7-2.2-4.2-0.9-2.8-3.0-1.8-2.0-2.7-5.8-2.0-1.42.15.2

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302011-06-302011-03-312010-06-302010-03-31
Value-51.695-26.02-13.336-286.185-6.162194-6.581-18.534-12.821-22.464-32.374-17.625-19.545-21.439-21.678-18.092-17.477-20.669-20.217-15.749-1.673-3.499-2.454-3.007
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.4-3.1-1.6-36.0-1.027.7-0.9-2.4-1.7-3.2-4.2-2.1-2.5-3.1-3.1-2.4-2.4-3.2-2.9-2.2-0.3-0.8-0.6-0.8

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value61-2.41236-138.64554150182.10743-51.7871218343.88116.46519-32.027-16.115
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.4-0.34.4-17.48.621.42.50.35.6-7.31.62.24.40.61.70.92.7-4.9-2.3

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-2.614-4.9984.8848.001-2.355-2.815-8.6888.9755.708-0.584-1.82514-8.069-2.749-16.0593.1596.884-4.197-4.6770.6648.3235.21224-5.303-4.0661.50712-5.0511.135-3.493-4.597-0.0092.995-8.756-6.5644.725-4.219-4.3019.858-0.2330.037-6.606-4.7351.479-3.232-4.968
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value303030302929292927262628272626252525262525252423222222222120242220191918181717171718
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arcb:ArcbestSegment


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2.3662.3862.3822.4132.4492.472.5312.6073.0553.1513.1873.5583.5973.4083.5793.0153.3373.3663.6543.6843.4753.465
Percentage of DepreciationDepletionAndAmortization7.87.97.98.08.48.58.78.911.111.911.812.713.212.913.611.813.213.313.914.313.513.8

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value23232324232323232120212221202020212023192020
Percentage of DepreciationDepletionAndAmortization77.077.478.280.180.280.280.481.079.379.179.779.278.679.079.080.684.682.690.977.381.281.1

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302011-06-302011-03-312010-06-302010-03-31
Value1232254695823325783-3.371815487315347491.761223539-6.35424-5.675
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.02.76.78.79.43.34.57.310.9-0.510.66.511.14.57.56.36.90.33.35.07.9-1.56.1-1.6

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value60232329151.902-5.54916244.88815401.2339.954361415-7.4071.5841210-6.1034.98919190.745141917-5.19310134.878-13.395-7.9296.51811-18.1621.404125.298-12.808-3.109-0.749-7.444-21.391
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.82.93.72.50.3-0.82.13.20.72.04.90.21.45.12.02.2-1.10.21.81.5-1.00.82.72.90.12.22.82.6-0.91.82.20.8-2.6-1.51.12.3-4.10.32.41.1-2.9-0.7-0.2-1.8-5.9

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value602329151.90216244.88815401.2339.954361415-7.4071.5841210-6.1034.98819190.745141917-5.19310134.878-13.395-7.9296.51811-18.1621.404125.298-12.808
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.83.72.50.32.13.20.72.04.90.21.45.12.02.2-1.10.21.81.5-1.00.82.72.90.12.22.82.6-0.91.82.20.8-2.6-1.51.12.3-4.10.32.41.1-2.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value60232329151.902-5.54916244.88815401.2339.954361415-7.4071.5841217-5.1934.878-13.395-7.9296.51811-18.1621.404125.451-12.787-3.117-0.585-7.348-21.371
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.82.93.72.50.3-0.82.13.20.72.04.90.21.45.12.02.2-1.10.21.82.6-0.90.8-2.6-1.51.12.3-4.10.32.41.1-2.9-0.7-0.1-1.8-5.9

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.3242.3542.5222.8852.892.1812.2552.4092.8012.0582.2282.6411.6741.871.8881.4711.8681.7311.4371.9512.4911.7091.6862.112.5861.6471.6361.6942.11.5681.9151.0941.1821.3031.3571.3691.91.4421.3341.4172.2531.4461.4992.0330.8431.315
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302011-06-302011-03-312010-06-302010-03-31
Value-10.5941.074-5.078781.349-67.151-7.699-36.901-27.689-25.952-36.644-18.261-33.589-6.456-20.158-22.458-12.734-13.119-18.496-41.673-9.763-5.9418.76218
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.10.1-0.69.90.2-9.6-1.1-4.7-3.6-3.6-4.7-2.2-4.2-0.9-2.8-3.0-1.8-2.0-2.7-5.8-2.0-1.42.15.2

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value159.588233.9379.4716.738212726154.74314177.177211714122219121324191716118.1866.9168.654134.445.1983.445.35513162.3882113162.5867.10.9231.3072.092
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302011-06-302011-03-312010-06-302010-03-31
Value-51.695-26.02-13.336-286.185-6.162194-6.581-18.534-12.821-22.464-32.374-17.625-19.545-21.439-21.678-18.092-17.477-20.669-20.217-15.749-1.673-3.499-2.454-3.007
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.4-3.1-1.6-36.0-1.027.7-0.9-2.4-1.7-3.2-4.2-2.1-2.5-3.1-3.1-2.4-2.4-3.2-2.9-2.2-0.3-0.8-0.6-0.8

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3717162801414151314152116171616171717151311118.6777.5817.3017712118.7637.765119.766111030106.2286.0755.173.8923.5513.4432.912.1561.5821.429
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument

us-gaap:RevolvingCreditFacility


Repayments
Period End2021-06-302020-08-312020-09-30
Value20180180
Percentage of RepaymentsOfLongTermDebt53.764.20.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.0582.0372.0352.042.0492.0332.0422.0432.052.0522.0682.062.0582.0582.0572.0632.0782.0662.0692.0742.0872.0882.0971.5781.5781.5841.6440.8230.8160.8190.8150.8050.8060.8070.8070.8070.8080.7970.7970.7980.7970.7880.7860.7860.7770.777
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value7.0991.0010.9282.5050.03.1622.9950.9442.5082.6639.2030.00.00.2010.02.4081.9162.4782.5142.6022.7614.0223.5232.459
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:ShareRepurchaseProgram

arcb:StockRepurchaseProgram


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-02-28
Value7.11.00.92.50.03.23.05.22.79.20.00.00.20.02.41.92.52.52.62.84.02.5
Percentage of PaymentsForRepurchaseOfCommonStock100.099.997.099.80.0101.2100.2207.3101.4100.00.00.099.50.099.799.2100.999.499.9101.499.50.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value17.025.5-1.224.90.2340.203-0.060.3030.2740.2590.0190.245-0.68-0.107-0.5070.3860.3460.414-0.0310.370.375-0.374-0.0120.4020.3930.183-0.0330.3970.3710.420.170.3340.38-0.425-1.5870.446-0.9460.194-0.015-0.015-0.0020.365-0.017-0.759
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value6658484351391041041187965
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value93816354788180771129478
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312014-12-312013-12-312012-12-312011-12-31
Value900000.0900000.01000000.01000000.01000000.01000000.01000000.0900000.0900000.0700000.0700000.0300000.000
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-03-312011-12-312010-12-31
Value1400000.01400000.01284000.01000000.0900000.0900000.0668000.0100000.0100000.053000.0900000.0700000.0600000.0844000.0293000.0354000.0332000.01028000.02511000.04700000.05644000.02455000.0
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:IncomeTaxAuthority

us-gaap:ForeignCountry


Deferred
Period End2020-12-312019-12-31
Value400000.0700000.0
Percentage of DeferredTaxAssetsValuationAllowance31.2104.8

Proceeds From Sale Of Short Term Investments

us-gaap:ProceedsFromSaleOfShortTermInvestments

us-gaap:ProceedsFromSaleOfShortTermInvestments


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value24242414534123155284.99810338.4026.24523402.946.12520378.5757.842022181411152.9742.9435156.373.1852822112.9420411542
Percentage of ProceedsFromSaleOfShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:DefinedBenefitPlanBenefit us-gaap:RetirementPlanType

arcb:DefinedBenefitPlanBenefit

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-09-302020-06-302020-03-31
Value00700000.0
Percentage of DefinedBenefitPlanBenefit0.00.0100.0

arcb:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesHighEndOfRange

arcb:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesHighEndOfRange


Effective
Period End2021-06-302021-03-31
Value06.5
Percentage of EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesHighEndOfRange0.0100.0

arcb:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesLowEndOfRange

arcb:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesLowEndOfRange


Effective
Period End2021-06-302021-03-31
Value06.0
Percentage of EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesLowEndOfRange0.0100.0

arcb:FuelSuppliesAndExpenses

arcb:FuelSuppliesAndExpenses


Fuel
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value807362615471748180797982847877756872666970646977787583899188
Percentage of FuelSuppliesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:FuelSuppliesAndExpenses us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Fuel
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value646052504561616566646564656259577575122557266
Percentage of FuelSuppliesAndExpenses80.883.283.681.883.385.382.281.182.881.682.078.076.679.177.075.8110.9103.8185.079.2102.7103.8

arcb:IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities

arcb:IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value43-1.4354.219510.567-15.4-15.313-5.70529-35.9990.71110373.513-7.5228.90818-9.155-3.47-0.247-0.655-6.884-24.0980.6920-11.759-16.644191217-13.2653.6847.02811
Percentage of IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:IncreaseDecreaseInOperatingRightOfUseAssetsAndLeaseLiabilitiesNet

arcb:IncreaseDecreaseInOperatingRightOfUseAssetsAndLeaseLiabilitiesNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-194000.0-567000.0-522000.0-464000.092000.0138000.0-202000.0-367000.0-119000.0-40000.0
Percentage of IncreaseDecreaseInOperatingRightOfUseAssetsAndLeaseLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:InnovativeTechnologyCosts us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

arcb:InnovativeTechnologyCosts

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Innovative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value7.5326.8686.9376.1994.7894.5334.5394.6642.7351.8020.8631.08
Percentage of InnovativeTechnologyCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:MultiemployerPensionPlansPercentageOfContributions us-gaap:RetirementPlanName, us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments

arcb:MultiemployerPensionPlansPercentageOfContributions

arcb:CentralStatesPensionPlan, us-gaap:PensionPlansDefinedBenefit, arcb:AssetBasedSegment


Multiemployer
Period End2021-06-302021-03-312020-12-31
Value00.50
Percentage of MultiemployerPensionPlansPercentageOfContributions0.0100.00.0

arcb:MultiemployerPlansCriticalAndDecliningStatusThresholdFundedPercentageForGreaterInsolvencyPeriod us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments

arcb:MultiemployerPlansCriticalAndDecliningStatusThresholdFundedPercentageForGreaterInsolvencyPeriod

us-gaap:PensionPlansDefinedBenefit, arcb:AssetBasedSegment


Multiemployer
Period End2021-06-302021-03-312020-01-01
Value080.080.0
Percentage of MultiemployerPlansCriticalAndDecliningStatusThresholdFundedPercentageForGreaterInsolvencyPeriod0.0100.0100.0

arcb:NonoperatingIncomeExpenseAndInterestAndDebtExpense

arcb:NonoperatingIncomeExpenseAndInterestAndDebtExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-841000.0-844000.0-53000.0-604000.0309000.0-5434000.0-798000.0-7866000.0-1640000.0-1995000.0-16492000.0-2064000.0-2422000.0-3734000.0-660000.0-281000.0-599000.0-394000.0-115000.0185000.0-273000.0-480000.0-445000.0-1392000.0-557000.0-368000.01591000.0-385000.0419000.0-253000.0
Percentage of NonoperatingIncomeExpenseAndInterestAndDebtExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:OperatingLeaseChangeInOperatingLeaseLiabilities

arcb:OperatingLeaseChangeInOperatingLeaseLiabilities


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5.4515.1744.9444.2525.2795.9535.1444.9424.9354.69
Percentage of OperatingLeaseChangeInOperatingLeaseLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:OperatingLeaseNoncashChangeInOperatingRightOfUseAssets

arcb:OperatingLeaseNoncashChangeInOperatingRightOfUseAssets


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5.6455.7415.4664.7165.1875.8155.3465.3095.0544.73
Percentage of OperatingLeaseNoncashChangeInOperatingRightOfUseAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:OperatingRightUseOfAssetsAndLeaseLiabilitiesNet

arcb:OperatingRightUseOfAssetsAndLeaseLiabilitiesNet


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value194000.0567000.0522000.0464000.0-92000.0-138000.0202000.0367000.0119000.040000.0
Percentage of OperatingRightUseOfAssetsAndLeaseLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsNetOfTax

arcb:OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsNetOfTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value00066000.0275000.05850000.0206000.01007000.08408000.0384000.0320000.0486000.0312000.0577000.0454000.01196000.0588000.0490000.0345000.0550000.0442000.0466000.0364000.0684000.0727000.0492000.0556000.02255000.0169000.01121000.0
Percentage of OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsNetOfTax0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsNetOfTax us-gaap:RetirementPlanType

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Other
Period End2020-09-302020-06-302020-03-31
Value00100000.0
Percentage of OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsNetOfTax0.00.0151.5

arcb:OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsTax

arcb:OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value00023000.095000.0651000.072000.0349000.02914000.0134000.0111000.0168000.0200000.0366000.0290000.0761000.0374000.0313000.0219000.0350000.0282000.0296000.0233000.0435000.0463000.0313000.0353000.01436000.0108000.0713000.0
Percentage of OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsTax0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:PurchasedTransportation us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

arcb:PurchasedTransportation

us-gaap:OperatingSegments, arcb:ArcbestSegment


Purchased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value226210206181125137153164147140155164162148146155139121135132121111
Percentage of PurchasedTransportation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:RentsAndPurchasedTransportation us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

arcb:RentsAndPurchasedTransportation

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Rents
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value95757869465554615749617063465155534653584739
Percentage of RentsAndPurchasedTransportation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:RentsPurchasedTransportationOtherCostsOfServices

arcb:RentsPurchasedTransportationOtherCostsOfServices


Rents
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value347309302267187217228249236221246265253223218235216199222218199183192209200177195215184164
Percentage of RentsPurchasedTransportationOtherCostsOfServices100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:SegmentPercentageOfRevenueBeforeOtherRevenuesAndIntercompanyEliminations us-gaap:StatementBusinessSegments

arcb:SegmentPercentageOfRevenueBeforeOtherRevenuesAndIntercompanyEliminations

arcb:AssetBasedSegment


Segment
Period End2021-06-302021-03-312020-12-31
Value1.064.0-1.0
Percentage of SegmentPercentageOfRevenueBeforeOtherRevenuesAndIntercompanyEliminations100.0100.0100.0

arcb:SharedServices us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

arcb:SharedServices

us-gaap:OperatingSegments, arcb:ArcbestSegment


Shared
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value2926262418212225232322232321212220192021
Percentage of SharedServices100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Shared
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value6955626045485156565057585645474846434546
Percentage of SharedServices238.6214.3237.0250.5242.1225.0224.6223.8242.1220.2256.6248.8241.4208.6226.7213.8225.6222.1223.4216.3

arcb:SuppliesAndExpenses us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

arcb:SuppliesAndExpenses

us-gaap:OperatingSegments, arcb:ArcbestSegment


Supplies
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2.4762.5682.6122.7461.9892.282.3772.782.8582.7743.0393.5223.5383.233.8223.8536.7695.2869.9973.2634.6414.418
Percentage of SuppliesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value9601000.0165000.0919000.01010000.060000.024000.01174000.08000.02047000.03000.044000.041000.0129000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value9601000.0165000.0919000.01010000.060000.024000.01174000.08000.02047000.03000.044000.041000.0129000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-30
Value5.7510.233-0.4791.2890.8180.039-18.715-0.453162.8782.369-8.2117.7660.8830.883-2.3282.7390.44-8.994-1.2232.1288.486-6.402-1.8228.8090.163-8.7042.7636.7670.1020.06-0.0040.0950.1730.267-7.3825.3562.06-4.839-0.1813.2132.145-0.035
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared us-gaap:SubsequentEventType

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:SubsequentEvent


Common
Period End2020-07-242020-05-012020-01-282019-10-292019-07-252019-04-302019-01-252018-10-302018-07-272018-05-012018-01-262017-07-252017-05-022017-01-312016-11-012016-07-282016-04-262015-10-222014-04-232013-10-252013-07-252013-04-232012-10-23
Value0.080.080.080.080.080.080.080.080.080.080.080.080.080.080.080.080.080.080.030.030.030.030.03
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments

us-gaap:ConcentrationRiskPercentage1

us-gaap:NumberOfEmployeesTotal, us-gaap:UnionizedEmployeesConcentrationRisk, arcb:AssetBasedSegment


Concentration
Period End2021-03-312020-03-312019-03-31
Value82.00.820.82
Percentage of ConcentrationRiskPercentage1100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments

arcb:AssetBasedAndArcbestSegments, us-gaap:RevenueFromContractWithCustomer, us-gaap:CustomerConcentrationRisk, arcb:FleetnetSegment


Concentration
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value18.00.20.20.190.190.140.060.03
Percentage of ConcentrationRiskPercentage10.00.024.40.00.017.10.00.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value137000.0137000.0149000.0150000.0149000.0149000.0-224000.0-225000.0-224000.0-225000.0-76000.0-76000.0-76000.0-76000.0-174000.0-173000.0-174000.0-173000.0-176000.0-177000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-3000.0-2000.0-1000.0-2000.0-1000.0-4000.0-24000.0-24000.0-23000.0-24000.0-21000.0-20000.0-20000.0-20000.0-21000.0-20000.0-21000.0-20000.0-38000.0-38000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses-2.2-1.5-0.7-1.3-0.7-2.710.710.710.310.727.626.326.326.312.111.612.111.621.621.5

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.1070.1070.1440.1440.1440.1440.3030.3030.3030.3030.2090.2090.210.2090.2650.2650.2650.2650.2540.254
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.0010.0010.0020.0020.0020.0030.010.0090.010.010.0270.0270.0270.0270.0250.0260.0250.0260.0330.032
Percentage of DefinedBenefitPlanInterestCost0.90.91.41.41.42.13.33.03.33.312.912.912.912.99.49.89.49.813.012.6

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.0180.0180.0410.040.0420.0420.5990.60.5990.5990.3530.3540.3530.3540.5140.5130.5130.5130.490.491
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.0040.0030.0030.0040.0030.0960.4040.0330.0330.0340.0480.0470.0470.0470.0460.0460.0460.0460.2770.07
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost22.216.77.310.07.1228.667.45.55.55.713.613.313.313.38.99.09.09.056.514.3

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value000-89000.0-370000.0-6501000.0-278000.0-1356000.0-11322000.0-518000.0-431000.0-654000.0-512000.0-943000.0-700000.0-1957000.0-962000.0-800000.0-600000.0-900000.0-724000.0-800000.0-600000.0-1119000.0-1190000.0-800000.0-900000.0-3691000.0-277000.00
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanType

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-31
Value000-89000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.00.00.0100.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value48000.048000.047000.046000.047000.047000.080000.080000.080000.080000.091000.092000.091000.092000.0123000.0122000.0122000.0122000.0108000.0107000.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value292929292828282826252526262525252424
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DirectCommunicationsAndUtilitiesCosts us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:DirectCommunicationsAndUtilitiesCosts

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Direct
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4.6634.974.494.3734.3424.7114.4335.0644.5294.624.0194.3084.1354.5214.1134.5754.5354.8226.2324.1144.2794.372
Percentage of DirectCommunicationsAndUtilitiesCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DirectTaxesAndLicensesCosts us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:DirectTaxesAndLicensesCosts

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Direct
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value121212121112121212121212111112111211
Percentage of DirectTaxesAndLicensesCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2.0582.0372.0352.042.0492.0332.0422.0432.052.0522.0682.062.0582.0582.0572.0632.0782.0662.0692.0742.0872.0882.0971.5781.5781.5841.6440.8230.8160.8190.8150.8050.8060.8070.8070.8070.8080.7970.7970.7970.7970.7880.7860.7860.7770.7773.8913.8923.8933.847
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value2.0582.0372.042.0492.0332.0432.052.0522.0682.062.0582.0582.0572.0632.0782.0662.0692.0742.0872.0882.0971.5781.5781.5841.6440.8230.8160.8190.8150.8050.8060.8070.8070.8070.8080.7970.7970.7980.7970.788
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.0100.0

us-gaap:FairValueOfAssetsAcquired

us-gaap:FairValueOfAssetsAcquired


Fair
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value8.7583929302257140.1212223370.6942125331.9472938
Percentage of FairValueOfAssetsAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfBusiness us-gaap:ConsolidationItems, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:StatementBusinessSegments

us-gaap:GainLossOnSaleOfBusiness

us-gaap:OperatingSegments, us-gaap:LandBuildingsAndImprovements, arcb:ArcbestSegment


Gain
Period End2021-06-30
Value6900000.0
Percentage of GainLossOnSaleOfBusiness100.0

us-gaap:GainLossOnSaleOfBusiness us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arcb:ArcbestSegment


Gain
Period End2021-06-302018-12-312018-09-302017-12-312017-09-30
Value6923000.001945000.00152000.0
Percentage of GainLossOnSaleOfBusiness100.30.00.00.00.0

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:GainLossOnSaleOfPropertyPlantEquipment


Gain
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8635000.0-904000.0-301000.01451000.02130000.03863000.0-85000.01426000.043000.0-129000.022000.0-55000.0221000.0-182000.0-3000.0-201000.0613000.0754000.095000.02175000.0311000.0534000.0642000.0739000.0310000.0864000.0348000.035000.0214000.0-333000.095000.0179000.0212000.0153000.066000.0231000.0285000.0426000.01061000.0778000.095000.0839000.070000.0-226000.0298000.0
Percentage of GainLossOnSaleOfPropertyPlantEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfPropertyPlantEquipment us-gaap:ConsolidationItems, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:LandBuildingsAndImprovements, arcb:AssetBasedSegment


Gain
Period End2021-06-302021-03-31
Value08600000.0
Percentage of GainLossOnSaleOfPropertyPlantEquipment0.099.6

us-gaap:GainLossOnSaleOfPropertyPlantEquipment us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-71000.08695000.0103000.0-133000.01175000.02164000.04189000.082000.01587000.034000.0-112000.0123000.0266000.0133000.096000.07000.0-25000.0617000.0529000.081000.02197000.0172000.0
Percentage of GainLossOnSaleOfPropertyPlantEquipment0.0100.7-11.444.281.0101.6108.4-96.5111.379.186.8559.1-483.660.2-52.7-233.312.4100.770.285.3101.055.3

us-gaap:GainLossOnSaleOfPropertyPlantEquipment us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType

arcb:AssetBasedSegment, us-gaap:SubsequentEvent


Gain
Period End2021-01-31
Value8500000.0
Percentage of GainLossOnSaleOfPropertyPlantEquipment0.0

us-gaap:IncreaseDecreaseInBookOverdrafts

us-gaap:IncreaseDecreaseInBookOverdrafts


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value4512000.0-5434000.06161000.0-266000.011484000.0-10869000.02848000.0-1172000.0-1874000.0-2524000.02237000.0913000.0-316000.0-2572000.0-2791000.04767000.0-1497000.0-981000.0-342000.02660000.0-1394000.0-5095000.01664000.03701000.0483000.0-2005000.0
Percentage of IncreaseDecreaseInBookOverdrafts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxes

us-gaap:IncreaseDecreaseInIncomeTaxes


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value5.8996.376-4.777-5.3485.4642.949-0.837-4.8411.271-4.3136.494-2.3496.0861.938-7.3244.7221.663-1.2053.6536.8455.949-10.211-23.2131.98914-2.426-21.9537.7555.836-3.611.66.7051.711-1.5481.6920.416-1.2711.793-9.2336.04
Percentage of IncreaseDecreaseInIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-189000.0164000.01272000.0440000.01442000.0-5800000.0-2871000.01438000.07387000.0-4589000.0-485000.06844000.0714000.0-2732000.0269000.0862000.0-257000.03357000.0700000.0369000.0332000.02954000.0-585000.0-120000.071000.0-456000.0-1970000.0-401000.0-228000.01710000.0-542000.01260000.0-667000.0964000.0-1552000.0139000.0299000.0153000.02928000.0-2147000.0-314000.0168000.02227000.047000.0-849000.0143000.0
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidExpense

us-gaap:IncreaseDecreaseInPrepaidExpense


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-4001000.02582000.08775000.0635000.0-4873000.03429000.04491000.0-3058000.0-2437000.05760000.04001000.01380000.0-4980000.02587000.027000.0-2512000.0-2625000.05174000.02501000.0-1914000.0-3192000.03998000.01991000.0-662000.0-3380000.01689000.03365000.0-94000.0-4546000.03163000.03438000.0-366000.0-3444000.02042000.02635000.0-1577000.0-2984000.01621000.02249000.0-308000.0-2676000.01840000.01580000.0-325000.0-2972000.01573000.0
Percentage of IncreaseDecreaseInPrepaidExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1522-0.77648-5.752-3.874-9.504-2.4352.15-3.931-23.733162110-16.0021424-3.3456.6641513-9.569-19.123-1.679150.902-14.2886.2921519-12.3139.896169.886-29.4648.071200.859-14.177-5.5129.582160.61610191.065
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterestAndDividend

us-gaap:InvestmentIncomeInterestAndDividend


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value322000.0392000.0494000.0756000.0991000.01375000.01591000.01768000.01616000.01478000.01554000.01120000.0714000.0526000.0388000.0346000.0285000.0274000.0345000.0390000.0387000.0401000.0402000.0378000.0271000.0234000.0251000.0215000.0194000.0190000.0182000.0167000.0161000.0171000.0185000.0155000.0215000.0253000.0279000.0273000.0273000.0243000.0274000.0313000.0274000.0334000.0
Percentage of InvestmentIncomeInterestAndDividend100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense

us-gaap:LaborAndRelatedExpense


Labor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value389359355363305344339363361343350363355328338350350334336345335329321334332306317321305286
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Labor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value302285275287248283274296297280279292286269271286314304383284303296
Percentage of LaborAndRelatedExpense77.779.577.579.281.682.380.981.582.281.679.880.480.682.180.281.889.791.0114.082.490.589.9

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value7.3917.8197.3696.8966.3046.7446.4456.436.3476.111
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MultiemployerPlanContributionRateIncreaseDecrease us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments

us-gaap:MultiemployerPlanContributionRateIncreaseDecrease

arcb:MultiemployerPlansHealthAndWelfare, arcb:AssetBasedSegment


Multiemployer
Period End2020-08-012019-08-012018-08-01
Value4.03.84.1
Percentage of MultiemployerPlanContributionRateIncreaseDecrease100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Oci
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value1488000.000-8000.06948000.0-894000.0-58000.0661000.0611000.0-5877000.01300000.02590000.0518000.0-1589000.0-98000.0-1471000.02874000.01294000.0-1931000.0-3504000.0-1303000.0-6780000.02379000.0-1831000.0-5495000.0-2595000.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value166000.0575000.0253000.0136000.0-174000.0-997000.0191000.0-338000.0-528000.0-332000.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent0.00.017.00.00.012462.52.737.8910.3-50.2

us-gaap:AccumulatedOtherComprehensiveIncome


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value778000.0904000.02668000.0833000.0283000.0-2425000.07380000.0-1267000.0-470000.0554000.0-615000.0-5583000.01423000.02954000.0744000.0-1270000.0-225000.0-1217000.03743000.01136000.0-2212000.0-3466000.0-1055000.0-7617000.02720000.0-2490000.0-5927000.0-2793000.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent0.00.0179.30.00.030312.5106.2141.7810.383.8-100.795.0109.5114.1143.679.9229.682.7130.287.8114.698.981.0112.3114.3136.0107.9107.6

us-gaap:AccumulatedTranslationAdjustment


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value612000.0329000.0927000.0697000.0457000.0-1420000.0241000.0-35000.0116000.0225000.0-516000.0127000.0-220000.0-72000.0-154000.0294000.0-208000.0119000.0223000.0-420000.0-135000.0584000.0-160000.0-354000.097000.0-295000.0-82000.0-198000.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent0.00.062.30.00.017750.03.53.9-200.034.0-84.5-2.2-16.9-2.8-29.7-18.5212.2-8.17.8-32.57.0-16.712.35.24.116.11.57.6

us-gaap:OperatingInsuranceAndClaimsCostsProduction us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingInsuranceAndClaimsCostsProduction

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value9.4548.9398.918.5878.2477.8249.2817.6467.5987.9918.8329.4487.9796.6287.6938.3487.547.1096.8438.4647.666.466
Percentage of OperatingInsuranceAndClaimsCostsProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.5846.6426.6096.3515.8035.7965.6595.6515.6425.339
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.3676.0796.0955.8895.9015.9255.4585.4415.5255.29
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-30
Value1.4880.00.0-0.0086.948-0.894-0.0580.6610.611-5.8771.32.590.518-1.589-0.098-1.4712.8741.294-1.931-3.504-1.303-6.782.379-1.831-5.495-2.595-0.181-5.2965.9282.35928-5.830.0
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-30
Value0.5160.00.0-0.0032.408-0.31-0.020.230.212-2.0380.450.8990.328-1.011-0.064-0.935-3.4420.8221.2292.23-0.83-4.3171.515-1.166-3.5-1.651-0.116-3.3723.7711.503183.7090.0
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value59000.0204000.089000.048000.0-766000.0-352000.068000.0-120000.0-187000.0-118000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value215000.0118000.0326000.0246000.0842000.0-502000.086000.0-12000.041000.079000.0-183000.045000.0-78000.0-223000.0-99000.0190000.0-134000.076000.0-9000.0127000.086000.0371000.0-802000.0225000.061000.0187000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.6780.8042.5570.7230.174-2.4677.8334.799-0.0411.858.382-4.7782.2364.0721.627-0.1750.7810.615.0222.404-1.116-2.2310.089-6.6353.708-1.179-4.779-1.9170.883-2.7546.5584.263291.731-4.1661.791.6831.723-25.2060.6431.1041.11
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.1-0.11.377-0.11-0.109-0.057.4015.1720.3711.9579.608-5.0722.1133.7081.401-0.4940.9080.3564.1532.562-0.835-2.269-0.159-5.7983.367-0.52-4.347-1.7190.782-2.7176.6484.16301.75
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-14.7-12.453.9-15.2-62.62.094.5107.8-904.9105.8114.6106.294.591.186.1282.3116.358.482.7106.674.8101.7-178.787.490.844.191.089.788.698.7101.497.6100.4101.1

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.1660.5750.2530.136-0.174-0.9970.191-0.338-0.528-0.332
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent24.571.59.918.8-100.040.42.4-7.01287.8-17.9

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.6780.8042.5570.7230.174-2.4677.8334.799-0.0411.858.382-4.7782.2364.0721.627-0.1750.7810.615.0222.404-1.116-2.2310.089-6.6353.708-1.179-4.779-1.9170.883-2.7546.5584.263291.731-4.1661.791.6831.723
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.6120.3290.9270.6970.457-1.420.241-0.0350.1160.225-0.5160.127-0.22-0.072-0.1540.294-0.2080.1190.223-0.42-0.1350.584-0.16-0.3540.097-0.295-0.082-0.1980.101-0.037-0.090.103-0.116-0.019
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent90.340.936.396.4262.657.63.1-0.7-282.912.2-6.2-2.7-9.8-1.8-9.5-168.0-26.619.54.4-17.512.1-26.2-179.85.32.625.01.710.311.41.3-1.42.4-0.4-1.1

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value100000.0100000.0110000.0110000.0109000.0108000.0-185000.0-222000.0-229000.0-295000.0-606000.0-438000.0-511000.0-649000.0-600000.0-547000.0-581000.0-660000.0-720000.0-807000.0-780000.0-714000.0-731000.0-545000.0-653000.0-656000.0-450000.0-413000.0-436000.0-353000.0-580000.0-709000.0-1779000.0-1779000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-34000.0-35000.0-38000.0-38000.0-39000.0-37000.062000.075000.077000.0100000.0204000.0146000.0171000.0219000.0362000.0331000.0352000.0401000.0439000.0496000.0477000.0437000.0445000.0330000.0396000.0400000.0268000.0244000.0261000.0206000.0352000.0433000.01115000.01114000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherCostAndExpenseOperating


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value272435332930293230323231302932313528253429283331282827292926
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arcb:ArcbestSegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2.0212.052.9241.9581.7962.5252.6362.3662.4452.4132.172.5462.5461.8813.0342.8173.8284.058113.1914.8884.094
Percentage of OtherCostAndExpenseOperating7.48.38.25.96.08.28.97.27.97.46.68.18.46.49.38.910.914.044.19.316.614.2

us-gaap:OperatingSegments, arcb:AssetBasedSegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.0770.4341.5331.9331.4481.7870.610.5921.4040.8820.7761.5310.9481.2992.5890.7572.6581.7915.2521.2632.3551.8
Percentage of OtherCostAndExpenseOperating0.31.84.35.84.85.82.11.84.52.72.44.93.14.47.92.47.66.220.23.78.06.3

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic


Participating
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value4000.017000.01000.0-6000.02000.011000.09000.022000.098000.04000.030000.0132000.044000.065000.017000.06000.089000.081000.018000.032000.0175000.0207000.019000.0709000.0981000.0848000.039000.0477000.0585000.0
Percentage of ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted


Participating
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value4000.017000.01000.0-7000.02000.011000.09000.021000.094000.04000.029000.0129000.043000.064000.017000.06000.087000.080000.018000.033000.0172000.0203000.019000.0709000.0981000.0848000.039000.0477000.0585000.0
Percentage of ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value9605000.0161000.076000.0919000.01010000.060000.085000.024000.01174000.08000.02047000.03000.035000.050000.0190000.0390000.02365000.0325000.0267000.0105000.01132000.0178000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireShortTermInvestments

us-gaap:PaymentsToAcquireShortTermInvestments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value25185.88612373236229134141214.4123440.06.22317332.94151238202218142.943.75217167.8081431156.375.8814235.36522
Percentage of PaymentsToAcquireShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToDevelopSoftware

us-gaap:PaymentsToDevelopSoftware


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.7725.7054.6733.0733.1533.3422.9762.9652.8792.6562.6861.4143.8332.1642.6152.9021.8832.442.8122.5622.432.6682.3572.0562.0122.0872.4022.1571.981.8791.7091.9091.962.091.8391.9441.8171.6181.561.5521.1561.0271.090.9721.1231.17
Percentage of PaymentsToDevelopSoftware100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromAccountsReceivableSecuritization

us-gaap:ProceedsFromAccountsReceivableSecuritization


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312017-12-312017-09-30
Value0.00.00.0450.00.0
Percentage of ProceedsFromAccountsReceivableSecuritization0.00.00.0100.00.00.0

us-gaap:ProceedsFromIncomeTaxRefunds us-gaap:IncomeTaxAuthority

us-gaap:ProceedsFromIncomeTaxRefunds

arcb:DomesticStateAndLocalJurisdiction


Proceeds
Period End2020-09-30
Value0.0
Percentage of ProceedsFromIncomeTaxRefunds0.0

us-gaap:ProceedsFromIncomeTaxRefunds us-gaap:Range, us-gaap:IncomeTaxAuthority

srt:Maximum, arcb:DomesticStateAndLocalJurisdiction


Proceeds
Period End2021-06-302021-03-31
Value0.00.1
Percentage of ProceedsFromIncomeTaxRefunds0.00.0

us-gaap:ProceedsFromIssuanceOfDebt us-gaap:DebtInstrument

us-gaap:ProceedsFromIssuanceOfDebt

us-gaap:NotesPayableOtherPayables


Proceeds
Period End2021-06-30
Value8.1
Percentage of ProceedsFromIssuanceOfDebt100.0

us-gaap:ProceedsFromIssuanceOfDebt us-gaap:DebtInstrument, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:NotesPayableOtherPayables, us-gaap:Vehicles


Proceeds
Period End2020-09-30
Value39
Percentage of ProceedsFromIssuanceOfDebt0.0

us-gaap:ProceedsFromIssuanceOfDebt us-gaap:DebtInstrument, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

us-gaap:NotesPayableOtherPayables, us-gaap:Vehicles, us-gaap:SubsequentEvent


Proceeds
Period End2020-11-012020-08-01
Value7.222
Percentage of ProceedsFromIssuanceOfDebt0.00.0

us-gaap:ProceedsFromIssuanceOfDebt us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:NotesPayableOtherPayables, us-gaap:SubsequentEvent


Proceeds
Period End2021-08-02
Value12
Percentage of ProceedsFromIssuanceOfDebt0.0

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromLinesOfCredit


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.00.0180
Percentage of ProceedsFromLinesOfCredit0.00.00.0100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.785104.4051.2732.9784.6928.7420.952.7591.0391.3390.8431.0241.050.6940.8341.0591.6921.5081.0463.8152.4352.5241.4251.7130.9772.2271.460.4950.7460.3370.4270.5880.8421.2712.4341.3771.3151.3842.3082.7580.6122.4860.7170.8671.809
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-238000.0-96000.02157000.01171000.0-384000.01383000.0391000.0211000.0509000.0112000.0399000.0868000.0624000.0445000.03376000.0-348000.0611000.0442000.0856000.0369000.0336000.082000.057000.0314000.0315000.0312000.0295000.0615000.0948000.084000.0407000.0346000.0343000.0969000.0210000.0585000.0454000.0275000.0289000.0983000.0824000.0298000.0415000.0150000.061000.0242000.0
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

arcb:AccumulatedDefinedBenefitPlansAdjustmentPensionSettlementExpense


Reclassification
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value000-89000.0-370000.0-6501000.0-278000.0-1356000.0-11322000.0-518000.0-431000.0-654000.0-512000.0-943000.0-744000.0-1957000.0-962000.0-803000.0-564000.0-900000.0-724000.0-762000.0-597000.0-1119000.0-1190000.0-805000.0
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value134000.0135000.0149000.0148000.0148000.056000.0-610000.0-6792000.0-578000.0-1745000.0-12115000.0-1085000.0-1095000.0-1505000.0-1445000.0-1792000.0-1648000.0-2989000.0-2092000.0-2077000.0-1792000.0-2022000.0
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent0.00.00.00.00.0-62.9164.9104.5207.9128.7107.0209.5254.1230.1282.2190.0221.5152.7217.5258.7317.7224.7

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value134000.0135000.0148000.0148000.0148000.0145000.0-248000.0-299000.0-308000.0-398000.0-816000.0-590000.0-688000.0-874000.0-981000.0-896000.0-952000.0-1079000.0-1178000.0-1321000.0-1276000.0-1169000.0-1195000.0-893000.0-1068000.0-1074000.0-737000.0-675000.0
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent0.00.00.00.00.0-162.967.04.6110.829.47.2113.9159.6133.6191.695.0128.055.1122.5164.5226.2129.9165.1117.2178.996.061.983.9

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value100000.0100000.0111000.0110000.0109000.042000.0-453000.0-6066000.0-429000.0-1296000.0-8997000.0-805000.0-813000.0-1118000.0-883000.0-1095000.0-1006000.0-1827000.0-1279000.0-1268000.0-1096000.0-1235000.0-1144000.0-982000.0-988000.0-1311000.0-1148000.0-876000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncome


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value100000.0100000.0111000.0110000.0109000.042000.0-453000.0-6066000.0-429000.0-1296000.0-8997000.0-805000.0-813000.0-1118000.0-883000.0-1095000.0-1006000.0-1827000.0-1279000.0-1268000.0-1096000.0-1235000.0-1144000.0-982000.0-988000.0-1311000.0-1148000.0-876000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodTax us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value34000.035000.038000.038000.039000.014000.0-157000.0-726000.0-149000.0-449000.0-3118000.0-280000.0-282000.0-387000.0-562000.0-697000.0-642000.0-1162000.0-813000.0-809000.0-696000.0-787000.0
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfAccountsReceivableSecuritization us-gaap:DebtInstrument

us-gaap:RepaymentsOfAccountsReceivableSecuritization

arcb:AccountsReceivableSecuritizationProgram


Repayments
Period End2020-09-30
Value85
Percentage of RepaymentsOfAccountsReceivableSecuritization100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.0921.9597.2843613105.9513.7614.90518
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302018-09-302018-06-302018-03-31
Value261000.012000.082000.0141000.06000.015000.0101000.06000.043000.03000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-06-302019-06-302017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302011-12-312011-09-302011-06-302011-03-31
Value-2000.0-1000.0-2000.0-1000.000-1000.00-3000.01000.00-1000.000-2000.01034000.02885000.000000-1000.0762000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.00.00.0100.00.0100.0100.00.0100.00.00.0100.0100.0100.00.00.00.00.00.0100.0100.0

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-06-302019-06-302017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302011-12-312011-09-302011-06-302011-03-31
Value2000.01000.02000.01000.0001000.001000.01000.001000.0002000.001000.0000001000.01000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation-100.0-100.0-100.0-100.00.00.0-100.00.0-33.3100.00.0-100.00.00.0-100.00.00.00.00.00.00.00.0-100.00.1

us-gaap:SubleaseIncome

us-gaap:SubleaseIncome


Sublease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value156000.0155000.0144000.0120000.042000.092000.089000.099000.069000.067000.0
Percentage of SubleaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockSharesAcquired us-gaap:StatementEquityComponents

us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockCommon


Treasury
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value111000.015000.077000.0150000.034000.094000.074000.0241000.0005000.0092000.065000.0
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStockValueAcquiredCostMethod


Treasury
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value7.0991.0012.5053.1620.9442.5082.6639.2030.00.00.2010.02.4081.9162.4782.5142.6022.7614.0223.5232.459
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStockCommon


Treasury
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value7.0991.0012.5053.1620.9442.5082.6639.2030.00.00.2010.02.4081.916
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


Variable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value963000.01332000.0904000.0665000.0543000.01040000.0875000.0878000.0774000.0839000.0
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302016-09-302016-06-302015-09-302015-06-302011-09-302010-09-30
Value1324400.01475500.01122400.0754400.0856420.0888610.0877310.0941930.01098200.01029200.0953500.0721820.0523850.0486970.0455840.0499140.0571580.000
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

arcb:AllowancesForCreditLossesAndReserveForCustomerDeductions

arcb:AllowancesForCreditLossesAndReserveForCustomerDeductions


Allowances
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value7396000.07736000.07851000.07343000.07130000.06111000.05448000.0
Percentage of AllowancesForCreditLossesAndReserveForCustomerDeductions100.0100.0100.0100.0100.0100.0100.0

arcb:BookOverdrafts us-gaap:BalanceSheetLocation

arcb:BookOverdrafts

arcb:AccountsPayableBalanceSheet


Book
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value21141717172116
Percentage of BookOverdrafts100.0100.0100.0100.0100.0100.0100.0

arcb:DebtInstrumentCollateralAccumulatedDepreciationAndAmortizationPropertyPlantAndEquipment

arcb:DebtInstrumentCollateralAccumulatedDepreciationAndAmortizationPropertyPlantAndEquipment


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value135126115103918171767882798792848795837261504132252026
Percentage of DebtInstrumentCollateralAccumulatedDepreciationAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:DebtInstrumentCollateralPropertyPlantAndEquipmentGross

arcb:DebtInstrumentCollateralPropertyPlantAndEquipmentGross


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value35335135334330429329327826426427328426025127228326022222220017414013811190
Percentage of DebtInstrumentCollateralPropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:DebtInstrumentCollateralPropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OtherMachineryAndEquipment


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-09-302014-12-31
Value2626262626262615155.9415.9415.9410.1010.10.10.0390.040.0070.0070.2550.255
Percentage of DebtInstrumentCollateralPropertyPlantAndEquipmentGross7.47.57.47.68.69.09.05.65.92.22.22.10.00.00.00.00.00.00.00.20.3

us-gaap:Vehicles


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value32632532631727626426526024525526427625724926928125822022019817213813610988
Percentage of DebtInstrumentCollateralPropertyPlantAndEquipmentGross92.692.592.692.490.790.390.393.392.996.596.697.199.199.199.199.299.198.999.299.199.098.798.798.297.7

arcb:DebtInstrumentCollateralPropertyPlantAndEquipmentNet

arcb:DebtInstrumentCollateralPropertyPlantAndEquipmentNet


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value2172252372402132112222011861811931961671661841881771501601491331081139164
Percentage of DebtInstrumentCollateralPropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance us-gaap:DebtInstrument

arcb:DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance

us-gaap:RevolvingCreditFacility


Debt
Period End2020-09-302020-06-302020-03-312019-12-31
Value3.120.03120.03120.0298
Percentage of DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance100.0100.0100.0100.0

arcb:DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance us-gaap:DebtInstrument, us-gaap:DerivativeInstrumentRisk

us-gaap:RevolvingCreditFacility, arcb:InterestRateSwapMaturingOnJune302022


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3.123.123.123.120.0312
Percentage of DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance0.00.00.0100.0100.0

us-gaap:RevolvingCreditFacility, us-gaap:InterestRateSwap


Debt
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value3.120.02980.02980.0310.0310.031
Percentage of DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance0.0100.00.00.00.00.0

arcb:DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:DerivativeInstrumentRisk

srt:ScenarioForecast, us-gaap:RevolvingCreditFacility, arcb:AmendedInterestRateSwapAgreementMaturingOnOctober12024


Debt
Period End2022-06-30
Value1.56
Percentage of DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance0.0

arcb:DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk

srt:ScenarioForecast, arcb:AmendedInterestRateSwapAgreementMaturingOnOctober12024


Debt
Period End2022-06-30
Value0.0156
Percentage of DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance0.0

arcb:DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

srt:ScenarioForecast, us-gaap:ForwardContracts, us-gaap:SubsequentEvent


Debt
Period End2022-06-30
Value0.0156
Percentage of DebtInstrumentInterestRateEffectiveFixedPercentageOnHedgedBalance0.0

arcb:DeferredCompensationCashBasedArrangementsLiabilityNoncurrent

arcb:DeferredCompensationCashBasedArrangementsLiabilityNoncurrent


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1413186.63.9
Percentage of DeferredCompensationCashBasedArrangementsLiabilityNoncurrent100.0100.0100.0100.0100.0

arcb:DeferredTaxAssetsMultiemployerPensionFundWithdrawal

arcb:DeferredTaxAssetsMultiemployerPensionFundWithdrawal


Deferred
Period End2020-12-312019-12-312018-12-31
Value5409000.05546000.05710000.0
Percentage of DeferredTaxAssetsMultiemployerPensionFundWithdrawal100.0100.0100.0

arcb:DeferredTaxAssetsOperatingLeaseLiabilities

arcb:DeferredTaxAssetsOperatingLeaseLiabilities


Deferred
Period End2020-12-312019-12-31
Value3319
Percentage of DeferredTaxAssetsOperatingLeaseLiabilities100.0100.0

arcb:DeferredTaxAssetsTaxDeferredExpenseSupplementalPensionLiabilities

arcb:DeferredTaxAssetsTaxDeferredExpenseSupplementalPensionLiabilities


Deferred
Period End2020-12-312019-12-312018-12-31
Value103000.01091000.01033000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseSupplementalPensionLiabilities100.0100.0100.0

arcb:DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets

arcb:DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets


Deferred
Period End2020-12-312019-12-31
Value3218
Percentage of DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets100.0100.0

arcb:DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherLongLivedAssets

arcb:DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherLongLivedAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value113107937395846461
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherLongLivedAssets100.0100.0100.0100.0100.0100.0100.0100.0

arcb:DepositsUninsuredAmount

arcb:DepositsUninsuredAmount


Deposits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value13215215611818624566546865948592696146463239397155696675847758744949
Percentage of DepositsUninsuredAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:FinancialInstrumentMeasurementInput us-gaap:DebtInstrument, us-gaap:MeasurementInputType

arcb:FinancialInstrumentMeasurementInput

arcb:NewEnglandPensionFundWithdrawalLiability, us-gaap:MeasurementInputDiscountRate


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value3.13.42.62.40.0230.034
Percentage of FinancialInstrumentMeasurementInput100.0100.0100.0100.0100.0100.0

arcb:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour

arcb:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour


Finite
Period End2021-06-302021-03-312020-09-30
Value3973000.03958000.07582000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour100.0100.0100.0

arcb:LandAndStructuresGross

arcb:LandAndStructuresGross


Land
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value345344342346344343342339339340339338338338344340338330305296287280273269267264251250249248245
Percentage of LandAndStructuresGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:LesseeOperatingLeaseLeaseNotYetCommencedAmount us-gaap:PropertyPlantAndEquipmentByType

arcb:LesseeOperatingLeaseLeaseNotYetCommencedAmount

arcb:LandAndStructuresLeaseTwo


Lessee
Period End2021-06-302020-06-302020-03-31
Value377.35.7
Percentage of LesseeOperatingLeaseLeaseNotYetCommencedAmount100.0100.0100.0

arcb:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

arcb:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour


Lessee
Period End2021-06-302021-03-312020-09-30
Value444351
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour100.0100.0100.0

arcb:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour us-gaap:PropertyPlantAndEquipmentByType

arcb:LandAndStructures


Lessee
Period End2021-06-302021-03-312020-09-30
Value444351
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour100.0100.0100.0

arcb:LineOfCreditFacilityAdditionalBorrowingCapacity us-gaap:DebtInstrument

arcb:LineOfCreditFacilityAdditionalBorrowingCapacity

arcb:AccountsReceivableSecuritizationProgram


Line
Period End2021-06-302021-05-312021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value10025252525252525252525
Percentage of LineOfCreditFacilityAdditionalBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevolvingCreditFacility


Line
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-08-312019-06-302019-03-31
Value125125125125125125100100100
Percentage of LineOfCreditFacilityAdditionalBorrowingCapacity125.0500.0500.0500.0500.0500.00.0400.0400.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value249280298307560568348322303299318319271274291283271239254247234212224202172167139130123109
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue us-gaap:DebtInstrument

arcb:FinanceLeaseObligations


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0040.0070.0080.010.0120.0140.0150.0940.1520.21
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue0.00.00.00.00.00.00.00.00.10.1

us-gaap:NotesPayableOtherPayables


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value196206225234209211227201184178
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue78.873.675.476.137.437.265.362.560.959.5

us-gaap:RevolvingCreditFacility


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5274737326426979787677
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue21.226.424.623.947.247.522.724.425.126.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value717173726868665855576363596368696864686559494838262427423832
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent us-gaap:DebtInstrument

arcb:FinanceLeaseObligations


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0040.0070.0070.0070.0070.0070.0070.0840.140.197
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent0.00.00.00.00.00.00.00.10.30.3

us-gaap:NotesPayableOtherPayables


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value71707271646263555253
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent99.198.798.898.893.991.995.594.893.792.9

us-gaap:RevolvingCreditFacility


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.6370.8990.8860.8993.2444.2331.9471.9512.232.59
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent0.91.31.21.24.76.22.93.34.04.5

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value4.5676.1179.57684261266901513111716777984839.162.3383.623.6322.35707071712.7320.2310.2290.227
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears us-gaap:DebtInstrument

us-gaap:NotesPayableOtherPayables


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.5676.1179.57614101418141311
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears100.0100.0100.017.03.95.320.689.1100.0100.0

us-gaap:RevolvingCreditFacility


Maturities
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value70251252711.733
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears83.096.194.779.410.9

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value72981023333343733989910414925232420135.31757473712.7322.6432.8962.4632.6070.2240.6832
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears us-gaap:DebtInstrument

us-gaap:NotesPayableOtherPayables


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value22273132292935312828
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears30.527.830.897.189.286.494.794.928.929.1

us-gaap:RevolvingCreditFacility


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5070700.9943.624.6781.9661.6947070
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears69.572.269.22.910.813.65.35.171.170.9

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value42434850485152888583854329267168135122222120175953454615535419
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears us-gaap:DebtInstrument

us-gaap:NotesPayableOtherPayables


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value41424749454650464340
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears97.596.998.098.293.391.496.453.050.648.5

us-gaap:RevolvingCreditFacility


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.0491.3620.9710.9083.2564.4141.8851.6681.9652.341
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears2.53.12.01.86.78.63.61.92.32.8

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value576064661481471025550474745808242424544848278734336252120343025
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears us-gaap:DebtInstrument

arcb:FinanceLeaseObligations


Maturities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0010.0030.0050.0070.0070.0070.0070.006
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears0.00.00.00.00.00.00.00.0

us-gaap:NotesPayableOtherPayables


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value56596365595859534743
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears98.698.398.698.740.339.458.495.494.292.3

us-gaap:RevolvingCreditFacility


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.7841.0050.9140.8853.144.0871.8451.6871.9422.383
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears1.41.71.41.32.12.81.83.03.95.1

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueThereafter

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueThereafter


Maturities
Period End2021-06-302020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-06-302016-12-312016-09-302016-06-302014-12-312014-09-302014-06-302014-03-31
Value0.1240.1330.2380.203700.1520.0591.7710.2250.4040.2570.0360.0240.08700.0780.1360.194
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueThereafter100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueThereafter us-gaap:DebtInstrument

us-gaap:NotesPayableOtherPayables


Maturities
Period End2021-06-302020-09-302020-06-302019-12-312019-06-30
Value0.1240.1330.2380.2030.152
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueThereafter100.0100.0100.0100.0100.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value111314162734252321232629222222201412119.9638.9058.96611101111114.6424.5854.695
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments us-gaap:DebtInstrument

us-gaap:NotesPayableOtherPayables


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value8.619.6281112111214131212
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments75.770.075.777.043.436.956.955.359.651.9

us-gaap:RevolvingCreditFacility


Maturities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.7664.123.5943.68614199.1588.7336.177.943
Percentage of MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments24.330.024.323.052.457.836.236.729.334.1

arcb:OperatingLossCarryforwardsExpireInTenYears us-gaap:IncomeTaxAuthority

arcb:OperatingLossCarryforwardsExpireInTenYears

us-gaap:DomesticCountry


Operating
Period End2020-12-31
Value300000.0
Percentage of OperatingLossCarryforwardsExpireInTenYears100.0

arcb:PrepaidAndIncomeTaxesReceivableCurrent

arcb:PrepaidAndIncomeTaxesReceivableCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value5.8714.604116.1634.2366.2319.4398.1865.2374.611.7266.7264.66510124.67310119.909132028183.0572.592129.922.2622.8624.2052.061
Percentage of PrepaidAndIncomeTaxesReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:RevenueEquipmentGross

arcb:RevenueEquipmentGross


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value933914916912891885896902888856858857818790793773763742743738723700699689655628633629617588589
Percentage of RevenueEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:ServiceOfficeAndOtherEquipmentGross

arcb:ServiceOfficeAndOtherEquipmentGross


Service
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value239235233233232230233229218206199192190189179168161155154156151148145142137135136128125124124
Percentage of ServiceOfficeAndOtherEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:SuretyBondsAmountOutstandingUnderUncollateralizedProgram us-gaap:DebtInstrument

arcb:SuretyBondsAmountOutstandingUnderUncollateralizedProgram

us-gaap:SuretyBond


Surety
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-31
Value616161616249
Percentage of SuretyBondsAmountOutstandingUnderUncollateralizedProgram100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent


Accrual
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value108.7228.4578.2158.2847.9718.0227.4187.3666.926.83
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedEnvironmentalLossContingenciesCurrent us-gaap:BalanceSheetLocation, us-gaap:EnvironmentalRemediationContingency

us-gaap:AccruedEnvironmentalLossContingenciesCurrent

arcb:AccruedLiabilitiesCurrent, arcb:EnvironmentalCleanupCosts


Accrued
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-31
Value500000.0500000.0700000.0400000.0600000.0600000.0600000.0600000.0600000.0600000.0400000.0400000.0400000.0500000.0500000.0600000.0800000.0800000.0800000.0
Percentage of AccruedEnvironmentalLossContingenciesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedSalariesCurrent

us-gaap:AccruedSalariesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value6749523527273522152017
Percentage of AccruedSalariesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedVacationCurrent

us-gaap:AccruedVacationCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5147413634333336403938
Percentage of AccruedVacationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3600000.03600000.03000000.02600000.05448000.05548000.06238000.06655000.07380000.07475000.08057000.07837000.07657000.06313000.06046000.05283000.05437000.05118000.04789000.04399000.04825000.05311000.05983000.05653000.05731000.05613000.04948000.04516000.04533000.04645000.05439000.05360000.05249000.04790000.04484000.05052000.05957000.06265000.05737000.05885000.03944000.03470000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value667000.0662000.0660000.0665000.0661000.0646000.0476000.0469000.0463000.0456000.0806000.0975000.0952000.0936000.0921000.0906000.0890000.0875000.0849000.0830000.0810000.01085000.01029000.0979000.0962000.01489000.01701000.01676000.01661000.01441000.01422000.01402000.01427000.01376000.01334000.01246000.01226000.0
Percentage of AllowanceForDoubtfulOtherReceivablesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AociBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AociBeforeTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Aoci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value4121000.04255000.04390000.02535000.02683000.02831000.02898000.0-7068000.0-8685000.0-9185000.0-11821000.0-24759000.0-17929000.0-20774000.0-25768000.0-28059000.0-27251000.0-28737000.0-29320000.0-36118000.0-40311000.0-38943000.0-35231000.0-34969000.0-25480000.0-30140000.0-17044000.0
Percentage of AociBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Aoci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-618000.0-843000.0-1622000.0-1964000.0-2148000.0-1912000.0-563000.0-822000.0-364000.0351000.0
Percentage of AociBeforeTaxAttributableToParent-15.0-19.8-36.9-77.5-80.1-67.5-19.411.64.2-3.8

us-gaap:AccumulatedOtherComprehensiveIncome


Aoci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value3595000.02677000.01586000.0-1864000.0-2843000.0-3078000.0260000.0-10292000.0-11404000.0-11346000.0-13836000.0-25115000.0-18683000.0-21566000.0-27181000.0-29845000.0-29562000.0-30839000.0-31840000.0-39915000.0-43991000.0-42163000.0-38507000.0-38656000.0-27793000.0-31932000.0-17907000.0
Percentage of AociBeforeTaxAttributableToParent87.262.936.1-73.5-106.0-108.79.0145.6131.3123.5117.0101.4104.2103.8105.5106.4108.5107.3108.6110.5109.1108.3109.3110.5109.1105.9105.1

us-gaap:AccumulatedTranslationAdjustment


Aoci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value92000.0-735000.0-1182000.0-2435000.0-3378000.0-3997000.0-2075000.0-2402000.0-2355000.0-2512000.0-2816000.0-2117000.0-2289000.0-1991000.0-1894000.0-1641000.0-2125000.0-1783000.0-1978000.0-2192000.0-1645000.0-1424000.0-2379000.0-2119000.0-1540000.0-1216000.0-863000.0
Percentage of AociBeforeTaxAttributableToParent2.2-17.3-26.9-96.1-125.9-141.2-71.634.027.127.323.88.612.89.67.45.87.86.26.76.14.13.76.86.16.04.05.1

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-06-302010-12-31
Value52393719411152213242144353916162427227.9239.875412927174048443739131515258.02115351936223650
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302011-06-302010-12-31
Value0.3540.3510.0120.0520.3510.8011.7611.5351.1990.4810.0860.1560.8490.848
Percentage of AssetsFairValueDisclosure0.70.90.10.21.61.85.03.97.42.90.40.62.31.7

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value52393719411152213242145374117172427227.9239.8754127
Percentage of AssetsFairValueDisclosure100.7100.9100.0100.0100.0100.0100.0100.1100.2101.6101.8105.0103.9107.4102.9100.4100.6100.0100.0100.0100.0100.0

us-gaap:CapitalizedComputerSoftwareGross

us-gaap:CapitalizedComputerSoftwareGross


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1701691631581551541511461431421381331311321291271241231201341311301271221201191161131111121101091071051031009964
Percentage of CapitalizedComputerSoftwareGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashAndCashEquivalentsFairValueDisclosure

arcb:CashAndCashEquivalentsCaption, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value4936341638113209.9422118423237131422255.703
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency

arcb:CashAndCashEquivalentsCaption, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value4936341638113209.9422118423237131422255.703
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashFlowHedgeDerivativeInstrumentAssetsAtFairValue us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashFlowHedgeDerivativeInstrumentAssetsAtFairValue

us-gaap:OtherNoncurrentAssets, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-06-302021-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value354000.0351000.012000.052000.0351000.0801000.01761000.01535000.01199000.0481000.086000.0156000.0
Percentage of CashFlowHedgeDerivativeInstrumentAssetsAtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashFlowHedgeDerivativeInstrumentAssetsAtFairValue us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherNoncurrentAssets, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-06-302021-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value354000.0351000.012000.052000.0351000.0801000.01761000.01535000.01199000.0481000.086000.0156000.0
Percentage of CashFlowHedgeDerivativeInstrumentAssetsAtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk

us-gaap:CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue

us-gaap:OtherNoncurrentLiabilities, arcb:AmendedInterestRateSwapAgreementMaturingOnOctober12024


Cash
Period End2020-12-312020-09-302020-06-30
Value200000.0300000.0200000.0
Percentage of CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue100.0100.0100.0

us-gaap:OtherNoncurrentLiabilities, arcb:InterestRateSwapMaturingOnJune302022


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value1000000.01200000.01400000.01700000.01900000.0600000.0
Percentage of CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue0.00.0700.0566.7950.00.0

us-gaap:CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherNoncurrentLiabilities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302017-09-302017-06-302016-12-31
Value973000.01194000.01622000.01964000.02148000.01912000.0563000.0834000.0548000.0231000.0342000.0542000.0
Percentage of CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue0.00.0811.0654.71074.00.00.00.00.00.00.00.0

us-gaap:CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherNoncurrentLiabilities, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302017-09-302017-06-302016-12-31
Value973000.01194000.01622000.01964000.02148000.01912000.0563000.0834000.0548000.0231000.0342000.0542000.0
Percentage of CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue0.00.0811.0654.71074.00.00.00.00.00.00.00.0

us-gaap:CashSurrenderValueOfLifeInsurance

us-gaap:CashSurrenderValueOfLifeInsurance


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5553494947454443413937
Percentage of CashSurrenderValueOfLifeInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateEffectivePercentage

us-gaap:RevolvingCreditFacility


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.21.21.31.30.0130.0210.0290.0320.0370.037
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtWeightedAverageInterestRate

us-gaap:DebtWeightedAverageInterestRate


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value2.90.0310.0340.0280.0230.0210.0170.0210.026
Percentage of DebtWeightedAverageInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtWeightedAverageInterestRate us-gaap:DebtInstrument

arcb:FinanceLeaseObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.33.33.33.30.0330.0330.0330.0530.0550.056
Percentage of DebtWeightedAverageInterestRate0.00.0113.80.00.00.0106.50.00.00.0

us-gaap:NotesPayableOtherPayables


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.93.03.03.00.0320.0330.0330.0340.0350.035
Percentage of DebtWeightedAverageInterestRate0.00.0103.40.00.00.0106.50.00.00.0

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent us-gaap:BalanceSheetLocation, us-gaap:DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensation

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent

us-gaap:OtherNoncurrentLiabilities, arcb:VoluntarySavingsPlanMutualFunds


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value3000000.02400000.02300000.02400000.02200000.02100000.03000000.0
Percentage of DeferredCompensationLiabilityClassifiedNoncurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent us-gaap:DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensation

us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent

arcb:DeferredSalaryAgreement


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1800000.02100000.02500000.02900000.03400000.03900000.04700000.05200000.0
Percentage of DeferredCompensationLiabilityCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationPlanAssets us-gaap:BalanceSheetLocation, us-gaap:DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensation

us-gaap:DeferredCompensationPlanAssets

us-gaap:OtherNoncurrentAssets, arcb:VoluntarySavingsPlanMutualFunds


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value3000000.02400000.02300000.02400000.02200000.02100000.03000000.0
Percentage of DeferredCompensationPlanAssets100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxAssetsNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value6419000.06289000.06158000.06975000.07507000.08145000.07725000.06128000.06296000.06905000.07468000.05967000.06226000.06095000.05965000.02747000.02722000.03064000.02978000.0
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value15913911297130121104
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsDeferredIncome


Deferred
Period End2020-12-31
Value1426000.0
Percentage of DeferredTaxAssetsDeferredIncome100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value948163557981807811510081
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1.3531.0931.1521.7812.2292.1852.849.84143.799
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1297000.01538000.01355000.01508000.01856000.02032000.01654000.01877000.02092000.01223000.0
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4871000.05359000.07660000.06236000.09903000.09552000.08589000.06349000.07127000.06701000.05410000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5827000.05605000.04893000.04466000.06961000.06926000.06310000.05898000.06034000.07138000.06199000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4041393653505150514545
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7.527.373141424283134370.954
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value6151000.04952000.03225000.03125000.05109000.04503000.04393000.03875000.0
Percentage of DeferredTaxLiabilitiesPrepaidExpenses100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1820292425
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value0.3923.2363.9483.8974.794
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation2.115.713.416.218.8

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-4.454-3.0257.3822.6375.391
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value0.0640.1270.4050.5430.635
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax-1.4-4.25.520.611.8

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value4454000.03024000.0-7416000.0-2764000.0-5708000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-64000.0-127000.0-405000.0-543000.0-635000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax-1.4-4.25.519.611.1

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-18751000.0-20630000.0-29488000.0-24097000.0-25532000.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-392000.0-3236000.0-3948000.0-3897000.0-4794000.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet2.115.713.416.218.8

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.30.0310.0420.0350.04
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1.10.0240.0360.0280.027
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate47.877.485.780.067.5

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value182029242524
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value0.3923.2363.9483.8974.7944.917
Percentage of DefinedBenefitPlanBenefitObligation2.115.713.416.218.820.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value3.7814.4287.0315.949
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.4240.4241.1420.718
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter11.29.616.212.1

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.5880.6860.9950.753
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312017-12-31
Value0.6911.013
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312017-12-31
Value0.6670.952
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312017-12-31
Value0.6670.879
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312018-12-312017-12-31
Value0.6181.0460.827
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-18751000.0-20630000.0-29488000.0-24097000.0-25532000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-392000.0-3236000.0-3948000.0-3897000.0-4794000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan2.115.713.416.218.8

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312016-12-31
Value7.00.0750.080.08
Percentage of DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1 us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312019-12-312018-12-312016-12-31
Value4.50.050.050.045
Percentage of DefinedBenefitPlanUltimateHealthCareCostTrendRate1100.0100.0100.0100.0

us-gaap:DerivativeAmountOfHedgedItem us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeAmountOfHedgedItem

srt:ScenarioForecast, us-gaap:RevolvingCreditFacility, arcb:AmendedInterestRateSwapAgreementMaturingOnOctober12024


Derivative
Period End2022-06-30
Value50
Percentage of DerivativeAmountOfHedgedItem100.0

us-gaap:DerivativeAmountOfHedgedItem us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

srt:ScenarioForecast, us-gaap:RevolvingCreditFacility, us-gaap:SubsequentEvent


Derivative
Period End2022-06-30
Value50
Percentage of DerivativeAmountOfHedgedItem100.0

us-gaap:DerivativeFixedInterestRate us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFixedInterestRate

arcb:AmendedInterestRateSwapAgreementMaturingOnOctober12024


Derivative
Period End2021-06-302021-03-312020-05-04
Value0.430.430.0043
Percentage of DerivativeFixedInterestRate100.0100.0100.0

us-gaap:DerivativeFixedInterestRate us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

srt:ScenarioForecast, us-gaap:ForwardContracts, us-gaap:SubsequentEvent


Derivative
Period End2022-06-30
Value0.0043
Percentage of DerivativeFixedInterestRate0.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent us-gaap:BalanceSheetLocation, us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent

us-gaap:OtherNoncurrentAssets, us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations


Disposal
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1100000.01300000.0700000.01400000.01200000.02100000.0300000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:RestrictedStockUnitsRSU


Employee
Period End2020-12-31
Value18
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0

us-gaap:FinancialLiabilitiesFairValueDisclosure us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FinancialLiabilitiesFairValueDisclosure

arcb:NewEnglandPensionFundWithdrawalLiability, us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value212121212122
Percentage of FinancialLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0

arcb:NewEnglandPensionFundWithdrawalLiability, us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value232325262624
Percentage of FinancialLiabilitiesFairValueDisclosure112.9109.9119.2122.0122.8111.1

us-gaap:NotesPayableOtherPayables, us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value187196214221197213
Percentage of FinancialLiabilitiesFairValueDisclosure890.0926.31000.71029.1911.3969.7

us-gaap:NotesPayableOtherPayables, us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value190201217225200216
Percentage of FinancialLiabilitiesFairValueDisclosure903.3947.21014.71045.0923.7983.0

us-gaap:RevolvingCreditFacility, us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value5070707025070
Percentage of FinancialLiabilitiesFairValueDisclosure237.1329.4327.0324.61151.2317.9

us-gaap:RevolvingCreditFacility, us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value5070707025070
Percentage of FinancialLiabilitiesFairValueDisclosure237.1329.4327.0324.61151.2317.9

us-gaap:FinancialLiabilitiesFairValueDisclosure us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value258288305313554345
Percentage of FinancialLiabilitiesFairValueDisclosure1227.01355.71427.71453.82553.91569.3

us-gaap:EstimateOfFairValueFairValueDisclosure


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value264294312321562350
Percentage of FinancialLiabilitiesFairValueDisclosure1253.31386.61461.01491.62589.11593.7

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value3231313029282728272524262524232221201817161514131311109.6778.5717.4786.4355.3914.3483.3042.2611.2180.2
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value3231302928272627262524232120191817161514131211109.6228.8137.9717.1676.3835.5674.794.0133.2372.461.6830.9060.13
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization98.398.398.297.097.197.097.097.397.297.297.285.785.284.684.083.482.781.981.079.878.977.876.675.374.073.873.974.174.574.474.474.474.474.574.474.465.0

us-gaap:OtherIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value0.5670.5580.5430.8990.8670.8420.8160.770.7450.7180.6840.6540.6190.5850.5490.5130.4780.4420.4060.3990.3330.2950.2570.2190.1830.1430.1050.0660.01
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization1.71.71.83.02.93.03.02.72.82.82.82.42.42.42.32.32.32.22.12.22.01.91.71.61.41.21.00.70.1

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive


Finite
Period End2020-12-31
Value3943000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value3815000.03815000.03838000.03871000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear


Finite
Period End2021-06-302021-03-312020-09-30
Value1911000.02870000.0977000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-31
Value3674000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value3674000.03674000.03689000.03696000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value3689000.03689000.03722000.03746000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value3722000.03722000.03815000.03844000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value53535354545454616161616464646464646464645656564949494848474646464646464636
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value52525252525252606060606060606060606060605252524444454444434343434343434333
Percentage of FiniteLivedIntangibleAssetsGross98.198.198.297.497.597.697.698.398.398.398.393.593.593.593.593.593.593.593.592.692.692.692.591.491.491.591.391.392.093.193.193.193.193.193.193.191.1

us-gaap:OtherIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value1.010.9940.981.421.3351.3151.2941.0321.0321.0321.0321.0321.0321.0321.0321.0321.0321.0321.0321.5721.0321.0321.0321.0321.0321.0321.0321.0320.599
Percentage of FiniteLivedIntangibleAssetsGross1.91.91.82.62.52.42.41.71.71.71.71.61.61.61.61.61.61.61.62.41.81.81.82.12.12.12.12.11.3

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:IntangibleAssetsGrossExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value86868686868686939393939696969699999999999292918483
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentsFairValueDisclosure us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:InvestmentsFairValueDisclosure

us-gaap:OtherNoncurrentAssets, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Investments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value3306000.03017000.02955000.02523000.03105000.02539000.02427000.03071000.03004000.02864000.02342000.02628000.02453000.02332000.02359000.02231000.02122000.02220000.0
Percentage of InvestmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentsFairValueDisclosure us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherNoncurrentAssets, us-gaap:FairValueMeasurementsRecurring


Investments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value3306000.03017000.02955000.02523000.03105000.02539000.02427000.03071000.03004000.02864000.02342000.02628000.02453000.02332000.02359000.02231000.02122000.02220000.0
Percentage of InvestmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value2221242322
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths us-gaap:PropertyPlantAndEquipmentByType

arcb:EquipmentAndOthers


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.0360.0360.2770.2770.998
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths0.20.21.11.24.4

arcb:LandAndStructures


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value2221242321
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths99.899.898.998.895.6

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value13185.94111175.4191015
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear us-gaap:PropertyPlantAndEquipmentByType

arcb:EquipmentAndOthers


Lessee
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value0.0680.2280.4770.7440.2630.542
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear0.43.84.14.24.95.1

arcb:LandAndStructures


Lessee
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value13185.71311165.15610
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.099.696.295.995.895.194.9

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LettersOfCreditOutstandingAmount


Letters
Period End2021-06-302021-03-312020-12-312019-12-312018-12-31
Value1112121217
Percentage of LettersOfCreditOutstandingAmount100.0100.0100.0100.0100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:DebtInstrument

arcb:AccountsReceivableSecuritizationProgram


Letters
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1011111112121212141416
Percentage of LettersOfCreditOutstandingAmount90.295.195.10.00.00.095.30.00.00.096.5

arcb:LettersOfCreditAgreements


Letters
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value121212121515
Percentage of LettersOfCreditOutstandingAmount0.00.00.00.00.00.0

arcb:LettersOfCreditSubCreditFacility


Letters
Period End2021-06-30
Value0.6
Percentage of LettersOfCreditOutstandingAmount5.4

us-gaap:RevolvingCreditFacility


Letters
Period End2021-06-30
Value0.6
Percentage of LettersOfCreditOutstandingAmount5.4

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

arcb:AccountsReceivableSecuritizationProgram


Line
Period End2021-06-302021-05-312021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312014-12-312014-09-302014-06-302014-03-31
Value5012512512512512512512512512512575757575
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arcb:RevolvingCreditFacilitySwingLineFacility


Line
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-31
Value2525252525252020
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity50.020.020.020.020.020.016.016.0

us-gaap:RevolvingCreditFacility


Line
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-08-312019-06-302019-03-31
Value250250250250250250200200200
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity500.0200.0200.0200.0200.0200.00.0160.0160.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

arcb:AccountsReceivableSecuritizationProgram


Line
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312014-09-302014-06-302014-03-31
Value39113113113282872727070575754
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevolvingCreditFacility


Line
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1991801801800.00.0180180130130
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity499.7158.9158.9158.90.00.0247.3247.3185.4185.4

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value666667655956575047485454515661626259646155454435242225403630313537394354463024211514143.603
Percentage of LongTermDebtAndCapitalLeaseObligationsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities

us-gaap:LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value237266284291532533323298282276291290249252268263257227243237225203212191160155127125112
Percentage of LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities us-gaap:DebtInstrument

arcb:FinanceLeaseObligations


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.0040.0070.0080.010.0120.0140.0150.0940.1520.210.266
Percentage of LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities0.00.00.00.00.00.00.00.00.10.10.1

us-gaap:NotesPayableOtherPayables


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value187196214221197198213188172166181
Percentage of LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities79.073.875.476.037.137.366.063.161.060.162.2

us-gaap:RevolvingCreditFacility


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value507070702502507070707070
Percentage of LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities21.026.224.624.046.946.821.623.524.825.324.0

us-gaap:MultiemployerPlansWithdrawalObligation us-gaap:BalanceSheetLocation, us-gaap:RetirementPlanName, us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments

us-gaap:MultiemployerPlansWithdrawalObligation

us-gaap:AccruedLiabilities, arcb:NewEnglandPensionFund, us-gaap:PensionPlansDefinedBenefit, arcb:AssetBasedSegment


Multiemployer
Period End2020-12-31
Value0.6
Percentage of MultiemployerPlansWithdrawalObligation100.0

us-gaap:OtherNoncurrentLiabilities, arcb:NewEnglandPensionFund, us-gaap:PensionPlansDefinedBenefit, arcb:AssetBasedSegment


Multiemployer
Period End2020-12-31
Value20
Percentage of MultiemployerPlansWithdrawalObligation3466.7

us-gaap:MultiemployerPlansWithdrawalObligation us-gaap:RetirementPlanName, us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments

arcb:NewEnglandPensionFund, us-gaap:PensionPlansDefinedBenefit, arcb:AssetBasedSegment


Multiemployer
Period End2020-12-31
Value21
Percentage of MultiemployerPlansWithdrawalObligation3566.7

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312019-12-31
Value3.183.77
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

arcb:StateAndLocalJurisdictionOtherSubsidiaries


Operating
Period End2020-12-31
Value11
Percentage of OperatingLossCarryforwards100.0

arcb:StateAndLocalJurisdictionPantherSubsidiary


Operating
Period End2020-12-31
Value5.3
Percentage of OperatingLossCarryforwards45.7

us-gaap:DomesticCountry


Operating
Period End2020-12-31
Value1.3
Percentage of OperatingLossCarryforwards11.2

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value18192921318789
Percentage of OperatingLossCarryforwards158.60.00.00.00.00.00.0

us-gaap:OperatingLossCarryforwardsValuationAllowance us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwardsValuationAllowance

us-gaap:DomesticCountry


Operating
Period End2020-12-31
Value100000.0
Percentage of OperatingLossCarryforwardsValuationAllowance100.0

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312017-12-31
Value600000.0700000.0
Percentage of OperatingLossCarryforwardsValuationAllowance600.00.0

us-gaap:OtherReceivablesNetCurrent

us-gaap:OtherReceivablesNetCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value131314141615181817161917191919151918138.9277.3466.8546.7187.1197.0836.2896.5826.1447.5696.947.2729.5326.6156.0116.5397.3127.538
Percentage of OtherReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:DefinedBenefitPostretirementHealthCoverage


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value0.5880.6860.9950.7530.69
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities100.0100.0100.0100.0100.0

us-gaap:PrepaidExpenseCurrent

us-gaap:PrepaidExpenseCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3640372928333025283125211924222224272219212420181922201717221915161917131512119.1149.422121010
Percentage of PrepaidExpenseCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SelfInsuranceReserveCurrent

us-gaap:SelfInsuranceReserveCurrent


Self
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value10310710399959696928675
Percentage of SelfInsuranceReserveCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType