MRTN


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

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementScenario, us-gaap:NonmonetaryTransactionType
us-gaap:CommonStockParOrStatedValuePerShare
us-gaap:StatementEquityComponents
us-gaap:SharesOutstanding
us-gaap:StatementScenario, us-gaap:NonmonetaryTransactionType
us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingExpenses

us-gaap:OperatingIncomeLoss
us-gaap:StatementBusinessSegments

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:Revenues
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:AccountsReceivableNetCurrent

us-gaap:OtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OperatingLeaseLiabilityNoncurrent
us-gaap:BalanceSheetLocation

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit
us-gaap:StatementBusinessSegments
us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInInvestingActivities
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:DeferredTaxLiabilities

us-gaap:UnrecognizedTaxBenefits

mrtn:AdjustmentsToAdditionalPaidInCapitalEmployeeTaxesPaidInExhangeForSharesWitheld
us-gaap:StatementEquityComponents

mrtn:AmortizationExpenseForTiresInService

mrtn:CommunicationsAndUtilitiesExpense

mrtn:FuelAndFuelTaxExpense

mrtn:IncreaseDecreaseCapitalExpendituresIncurredButNotYetPaid

mrtn:IncreaseDecreaseInAccruedOtherCurrentLiabilities

mrtn:OperatingLeaseAssetsAndLiabilitiesAcquired

mrtn:PurchasedTransportation

mrtn:SuppliesAndMaintenanceExpense

us-gaap:Depreciation

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:GainLossOnDispositionOfAssets

us-gaap:GeneralInsuranceExpense

us-gaap:IncreaseDecreaseInInsuranceLiabilities

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:LaborAndRelatedExpense

us-gaap:OtherCostAndExpenseOperating

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment
us-gaap:NatureOfExpense
us-gaap:RelatedPartyTransactionAmountsOfTransaction
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationGross

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross
us-gaap:StatementEquityComponents

us-gaap:StockOptionPlanExpense

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares

us-gaap:TaxesAndLicenses

mrtn:AccruedAndOtherLiabilitiesCurrent

mrtn:AccruedExpenses

mrtn:LesseeOperatingLeaseLiabilityPaymentsDueYearFourAndFive

mrtn:LineOfCreditFacilityDividendRestrictionsPercentageOfNetIncomeLimit

mrtn:LineOfCreditFacilityWaiverToPayDividendsMaximum
us-gaap:NonmonetaryTransactionType
mrtn:StockholdersEquityNoteStockSplitDividendSettlementPercent

us-gaap:AccruedInsuranceCurrent

us-gaap:AccruedSalariesCurrent

us-gaap:AccruedVacationCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
us-gaap:BalanceSheetLocation
us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LettersOfCreditOutstandingAmount
us-gaap:LossContingenciesByNatureOfContingency

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:DebtInstrument
us-gaap:LongtermDebtWeightedAverageInterestRate
us-gaap:LossContingenciesByNatureOfContingency

us-gaap:NontradeReceivablesCurrent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:FairValueByAssetClass
us-gaap:PrepaidExpenseCurrent

us-gaap:PrepaidInsurance
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentSalvageValuePercentage
us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PurchaseObligationDueInNextTwelveMonths
us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Net Income Loss
Expenses
Allocated Share Based Compensation Expense
Balance Sheet
Operating Lease Liability Noncurrent
Assets
Cash And Cash Equivalents At Carrying Value
Current Assets
Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Liabilities Current
Current Liabilities
Other Accrued Liabilities Current
Stockholders Equity
Common Stock Value
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Accounts Payable
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
Payments For Repurchase Of Common Stock
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Undiscounted Excess Amount
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CommonStockValue ████▅▅▅▅▅▅▅▅▅▅▅▅▅▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁0.8290.8280.8270.8270.5510.5480.5470.5470.5460.5460.5450.5470.5470.5460.5450.5450.5450.3270.3260.3260.3250.3240.3280.3360.3360.3350.3340.3340.3340.3330.3330.3320.3320.2210.2210.2210.2210.2210.220.220.22NA0.22NANA
 us-gaap:CommonStockParOrStatedValuePerShare us-gaap:StatementScenario,us-gaap:NonmonetaryTransactionType srt:ScenarioForecast,mrtn:StockSplitNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁82.88182.77582.70582.68155.10854.84154.70354.68754.63354.57254.46754.66354.65954.5954.53354.52254.51454.47554.392NANANA54.6NANANA55.698NANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementScenario,us-gaap:NonmonetaryTransactionType srt:ScenarioForecast,mrtn:StockSplitNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁83.39783.359NA83.27955.42255.243NA55.13455.08155.046NA55.19455.12655.095NA54.8954.80232.843NA32.71532.63332.639NA33.84633.85333.761NA33.69233.69633.631NA33.47533.37822.214NA22.14822.16622.141NA22.07422.085NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁82.8482.758NA82.67255.01854.809NA54.65554.61654.553NA54.66154.61354.572NA54.51754.49332.655NA32.53132.44132.454NA33.62233.58233.458NA33.40333.36933.34NA33.22633.2122.121NA22.07122.06622.033NA21.98521.984NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 Operating Margin us-gaap:StatementBusinessSegments mrtn:Brokerage█▇▆▄▄▅▆▆▇▆▅▄▃▃▃▂▁▂▂▂▁▂▃▃▂▂▂▁30.78827.8927.38122.07522.45624.79726.47827.35528.45526.60524.74120.99920.17920.45819.76316.62715.9818.03817.58616.27314.99717.57719.24618.7316.38717.0417.00415.441NA11.655NANANANANANANANANANANANANANANA
 Operating Margin us-gaap:StatementBusinessSegments mrtn:Dedicated████▇▇▇▇▇▆▆▆▆▅▄▄▄▄▄▄▄▃▃▃▂▂▂▂▁▁80.12178.23780.98378.33775.42775.03770.91570.33467.0157.72559.25758.79156.97148.83342.95342.14941.50240.27740.36240.63639.27537.09736.034.41425.40422.45421.96119.75115.0913.55NANANANANANANANANANANANANANANA
 Operating Margin us-gaap:StatementBusinessSegments mrtn:Intermodal█▅▅▅▃▆▇▅▄▆███▇▅▃▃▃▂▂▁▁▁▃▂▄▅▇25.59222.00422.77621.97620.30123.6824.52322.29720.60322.97125.96425.93925.4724.65222.42519.89519.11519.18618.14718.3617.78217.20117.68919.83119.04620.39222.17425.022NA23.69NANANANANANANANANANANANANANANA
 Operating Margin us-gaap:StatementBusinessSegments mrtn:Truckload▃▂▃▂▂▂▃▂▃▁▂▂▂▂▃▂▂▃▃▃▂▁▃▃▅▄█▇█▇95.94194.91596.19393.62394.295.13295.26994.98796.02291.72293.99993.9294.40493.01797.6392.00894.91495.65896.56695.19594.03690.05495.83898.371102.751101.401112.408111.336114.015110.514NANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 TTM Greenblatt ROC _ _█▆▇▇▇▄▅▅▅▄▅▅▅▃▃▃▄▃▃▃▃▃▄▃▃▄▄▃▃▁▃▃▃▃▃▂▃▂▃▂▂▁28.51823.99825.55824.425.25618.03218.78720.03419.94417.73319.53818.99318.22313.59414.33313.02215.56913.93814.53314.86914.77614.12515.23714.35414.16117.31116.39213.04212.9328.6412.68313.65313.12112.53813.2119.8413.2839.51912.95111.11111.3597.609NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AllocatedShareBasedCompensationExpense ▆▃▄▃▅▂▃▃▄▃█▆▆▃▃▂▄▁▁▁▃▂▂▃▄▂▂▁▃▂▂▂▃▂▂▂▄▂▃▃▃▂▃▃0.930.3360.4870.3920.7260.2460.4220.3930.6360.3661.2210.8920.8890.3210.3340.1860.5810.1490.1420.0730.3780.290.2150.3330.5830.2730.2010.1090.40.2110.2220.2110.4340.2170.1780.2560.5430.2480.4190.3350.3570.2380.4630.341NA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest █▆▇▆▇▃▄▄▄▃▄▄▃▁▂▁▂▁▁▂▂▁▂▂▂▃28.52724.00825.57124.41725.26918.12919.04920.28920.33918.01119.77219.11318.36113.78314.22413.00815.44413.79714.0914.52714.53913.9115.01214.22814.15517.296NANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ██████████████▁██████████████████████████████7.1096.0025.9676.3737.1354.4113.3013.7025.1494.4654.0353.8564.6593.452-50.855.1536.3035.5835.7876.096.0085.7176.2225.8185.7987.1087.1545.6165.6183.4515.4765.8065.6075.2675.473.2675.4673.9335.2074.4784.9193.3583.594.1524.008
us-gaap:IncomeTaxesPaidNet ▆▅█▆▅▄▅▅▅▅▆▅▅▅▅▅▇▅▅▅▅▂▆▅▆▁▆▇▇▅▅▆▆▆▅▅▅▅▆6.9691.3512.4374.5560.9870.00.5060.3042.7611.3826.7211.9570.3850.4633.3243.1397.6020.292.6261.0363.303-6.9346.5722.9894.705-12.1456.7658.2369.4182.3473.1755.2614.0573.6972.1132.4563.5880.6793.918NANANANANANA
us-gaap:NetIncomeLoss ▃▃▃▃▃▂▂▂▂▂▂▂▂▂█▁▂▁▁▁▂▁▂▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁21.41818.00619.60418.04418.13413.71815.74816.58715.1913.54615.73715.25713.70210.33165.0747.8559.1418.2148.3038.4378.5318.1938.798.418.35710.1888.9697.6527.9265.2877.3017.9777.6677.2027.7196.5187.5845.4467.6636.3336.1944.0955.215.4825.158
us-gaap:NonoperatingIncomeExpense ▄▄▄▄▄▅▆▆▇▆▅▅▅▅▃▄▃▃▁▂▂▃▂▃▄▄▂▅█▅▅▅▅▄▄▄▄0.0090.010.0130.0170.0130.0970.2620.2550.3950.2780.2340.120.1380.189-0.109-0.014-0.125-0.141-0.443-0.342-0.237-0.215-0.225-0.126-0.006-0.015-0.2690.2260.6120.0980.0940.130.1530.0150.0080.0060.013NANANANANANANANA
us-gaap:OperatingExpenses ███▇▇██▇▇▆▆▆▆▆▅▄▄▄▄▄▄▃▄▄▄▃▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▁▁203.924199.048201.775191.611187.128200.614198.398194.939192.146181.29184.423180.656178.801173.366168.438157.657155.942159.221158.128155.595151.314147.804153.536156.992149.427143.976157.155158.508155.491150.769153.541153.45148.292151.936153.201153.766143.681141.955145.389145.237139.776130.247127.496118.688116.669
us-gaap:OperatingIncomeLoss █▆▇▇▇▄▅▅▅▄▅▅▅▃▃▃▄▃▃▃▃▃▄▃▃▄▄▃▃▁▃▃▃▃▃▂▃▂▃▂▂▁▁▂▂28.51823.99825.55824.425.25618.03218.78720.03419.94417.73319.53818.99318.22313.59414.33313.02215.56913.93814.53314.86914.77614.12515.23714.35414.16117.31116.39213.04212.9328.6412.68313.65313.12112.53813.2119.8413.2839.51912.95111.11111.3597.6099.0769.9869.193
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax █▇█▇▇▇▇▇▇▆▆▆▆▅▅▄▄▄▄▄▄▃▄▄▃▃▄▄▄▃▄▄▃▄▄▃▃▃▃▃▃▂▂▁▁232.442223.046227.333216.011212.384218.646217.185214.973212.09199.023203.961199.649197.024186.96182.771170.679171.511173.159172.661170.464166.09161.929168.773171.346163.588161.287173.547171.55168.423159.409166.224167.103161.413164.474166.412163.606156.964151.474158.34156.348151.135137.856136.572128.674125.862
us-gaap:Revenues █▇█▇▇▇▇▇▇▆▆▆▆▅▅▄▄▄▄▄▄▃▄▄▃▃▄▄▄▃▄▄▃▄▄▃▃▃▃▃▃▂▂▁▁232.442223.046227.333216.011212.384218.646217.185214.973212.09199.023203.961199.649197.024186.96182.771170.679171.511173.159172.661170.464166.09161.929168.773171.346163.588161.287173.547171.55168.423159.409166.224167.103161.413164.474166.412163.606156.964151.474158.34156.348151.135137.856136.572128.674125.862
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets ██▇█▇▇▇▆▇▆▆▆▅▅▅▅▄▄▄▄▄▃▄▄▄▃▃▃▃▂▂▂▂▂▁▂▂▁▁▁▁884.363855.349831.636859.066840.834824.918796.586780.955796.595774.527753.904745.32724.439711.965690.403676.307670.584661.285653.748645.94627.556610.392631.528629.999614.613580.613579.66566.606562.142536.312525.802518.426520.53508.297490.623501.972494.467490.895470.579467.812461.252NA460.308NANA
us-gaap:Liabilities █▇▆▇▆▇▅▅▅▄▃▄▃▃▂▇▇▇▇▇▆▅▇▇▆▄▅▄▄▃▂▂▃▃▂▂▂▂▁▁▁230.722220.371211.303214.358211.436215.538198.997198.098194.205186.79177.95181.25175.197176.511164.903214.981215.96215.833216.41217.24208.099199.58222.107213.633206.213181.912191.734187.192189.75172.091166.665166.867176.435172.049158.7161.36160.093164.413150.22154.678154.52NA164.404NANA
us-gaap:LiabilitiesAndStockholdersEquity ██▇█▇▇▇▆▇▆▆▆▅▅▅▅▄▄▄▄▄▃▄▄▄▃▃▃▃▂▂▂▂▂▁▂▂▁▁▁▁884.363855.349831.636859.066840.834824.918796.586780.955796.595774.527753.904745.32724.439711.965690.403676.307670.584661.285653.748645.94627.556610.392631.528629.999614.613580.613579.66566.606562.142536.312525.802518.426520.53508.297490.623501.972494.467490.895470.579467.812461.252NA460.308NANA
us-gaap:StockholdersEquity █▇▆█▇▆▅▄▅▄▄▃▂▂▁653.641634.978620.333644.708629.398609.38597.589582.857602.39587.737575.954564.07549.242535.454525.5NANANA437.338NANANANANANANANANANANA359.137351.559344.095336.248329.36338.186331.964324.236318.17310.528304.3NA293.993NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AssetsCurrent ██▆▇█▅▅▅▇▇▆▅▄▃▃▂▂▂▁▁▁▁▂▁▂▃▂▂▂▂▂▁▁▂▂▁▁▂▂▂▂201.94201.058175.658192.546194.722159.547154.166147.899192.914193.267163.528145.603134.618118.711116.61894.882100.52499.68993.4390.70386.47187.989100.0593.859101.214112.174110.18595.363100.085108.678107.3594.62589.28697.14595.53494.32391.303106.022101.8105.216101.488NA87.706NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▇█▆█▇▄▃▄██▅▄▃▂▂▁▂▂▁▁▁▁▁▁▁▃▁▁▁▃▂▁▁▂▁▁▁▃▃▃▂▂▁▁▁80.67288.58366.12788.27975.32336.13631.46140.4882.79285.52656.76335.73922.00310.39815.7911.15910.0589.0650.4880.1750.2081.1560.4340.1454.49921.70.1230.1870.95619.31513.651.0720.6359.0413.4735.1275.24925.63820.82120.51415.0038.0415.3064.373.563
us-gaap:AccountsReceivableNetCurrent █▇▆▅▆█▇▆▇▆▆▆▆▆▄▄▃▃▃▃▂▂▃▃▃▃▄▄▄▃▃▄▃▂▂▃▂▁▁▂▂92.9289.55283.42680.71983.85494.27690.71285.14987.04484.44383.03384.05585.54982.0974.88672.91967.17469.80869.19969.87466.07665.28570.59770.82968.89868.68672.26373.20275.17670.30670.86972.65968.58865.9966.23968.84164.11458.63259.38562.66364.548NA51.094NANA
us-gaap:OtherAssetsCurrent NANA3.103NANANA3.166NANANA2.971NANANA2.786NANANA2.906NANANA2.408NANANA2.734NANANA2.606NANANA2.652NANANA2.946NANANANANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent █▃▆▄▇▂▅▂▃▁▃23.44419.43421.90320.6422.90619.05820.93818.57619.72418.02519.924NANANA19.81NANANA19.307NANANA18.134NANANA16.86NANANA15.274NANANA15.49NANANA15.426NANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:PropertyPlantAndEquipmentGross ████▇█▇▇▆▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▂▁▁947.071934.405930.123943.058920.608937.389904.237891.326857.41819.809816.43820.523805.723808.75783.648781.451775.149768.856759.553754.448744.234723.457724.597724.712700.123651.229645.972NANANANA583.445588.038560.017484.35556.323547.812531.594468.966513.951509.867NA515.622NANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ▇█████▇▇▇▆▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▁▂▁▁▁▂▁▁266.342281.812275.95278.488276.412274.047263.843261.474256.836241.658228.2223.087218.071217.558211.728201.882206.943209.226201.728202.092206.317204.41196.588192.144190.33186.371180.223174.951174.627171.886164.916163.171160.153152.071156.66149.28145.245147.309155.774151.925150.664NA143.563NANA
us-gaap:PropertyPlantAndEquipmentNet █▇▇█▇█▇▇▆▆▆▆▆▆▆▆▆▅▅▅▅▄▅▅▄▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁680.729652.593654.173664.57644.196663.342640.394629.852600.574578.151588.23597.436587.652591.192571.92579.569568.206559.63557.825552.356537.917519.047528.009532.568509.793464.858465.749467.32458.066424.145415.009420.274427.885407.946394.476407.043402.567384.285368.2362.026359.203NA372.059NANA
 us-gaap:OperatingLeaseRightOfUseAsset us-gaap:BalanceSheetLocation us-gaap:OtherNoncurrentAssetsNANA0.918NANANA1.178NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▃▃▄▄▄▄▄▆▆▆▄▅▄▄▄▄▄▄▅▆▆▇▇▇▇▇▇██▇▇▇▇▆▁▁▁▁▁▁▁1.6941.6981.8051.951.9162.0292.0263.2043.1073.1092.1462.2812.1692.0621.8651.8561.8541.9662.4932.8813.1683.3563.4693.5723.6063.5813.7263.9233.9913.4893.4433.5273.3593.2060.6130.6060.5970.5880.5790.570.561NA0.543NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AccountsPayableCurrent █▆▄▄▄▇▃▅▄▂▁39.27932.0625.70224.56326.17634.82122.91727.77724.29318.51215.704NANANA16.478NANANA14.391NANANA12.007NANANA17.065NANANA19.373NANANA16.081NANANA17.912NANANA17.8NANA
us-gaap:AccruedLiabilitiesCurrent NANA24.497NANANA21.68NANANA28.166NANANA21.622NANANA26.839NANANA21.634NANANA12.7138.70942.06342.46719.251NANANA16.981NANA44.8115.431NANANA12.724NANA
us-gaap:LiabilitiesCurrent █▇▆▆▆▆▅▆▆▅▄▄▄▄▃▃▄▃▃▃▃▃▂▃▅▂▁▂▂▂▂▂▂▃▁▂▂▃▁▂▂106.98997.85189.79487.94787.57991.12676.32684.9385.17679.54271.97373.55471.35674.83564.27765.13567.91464.56360.6764.08162.52961.53649.87665.05578.86656.81744.51852.49657.07557.31453.02851.96456.63561.30646.954.10953.87758.81646.38551.14151.873NA68.589NANA
 us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation mrtn:AccruedAndOtherCurrentLiabilitiesNANA0.507NANANA0.529NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent NANA2.881NANANA2.946NANANA4.214NANANA1.853NANANA3.718NANANA1.984NANANA0.902NANANA0.5613.82414.02913.5880.96713.32712.41414.00613.04214.92915.136NA17.653NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:DeferredIncomeTaxLiabilitiesNet ▄▃▁█▄▅▂123.312122.183121.098125.89123.285123.79122.022NANANA105.977NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▅▄▅▆▇▇▇█▅▅▁0.4210.3370.4110.5210.5720.6220.6490.7140.4510.4520.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA0.202NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA0.132NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity █▇▆█▇▆▅▄▅▄▄▃▂▂▁653.641634.978620.333644.708629.398609.38597.589582.857602.39587.737575.954564.07549.242535.454525.5NANANA437.338NANANANANANANANANANANA359.137351.559344.095336.248329.36338.186331.964324.236318.17310.528304.3NA293.993NANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ██▇██▇▇▇▇▇▇▆▆▆▆▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁653.641634.978620.333644.708629.398609.38597.589582.857602.39587.737575.954564.07549.242535.454525.5461.326454.624445.452437.338428.7419.457410.812409.421416.366408.4398.701387.926379.414372.392364.221359.137351.559344.095336.248331.923340.612334.374326.482320.359313.134306.732300.415295.904290.516285.14
us-gaap:CommonStockValue ████▅▅▅▅▅▅▅▅▅▅▅▅▅▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁0.8290.8280.8270.8270.5510.5480.5470.5470.5460.5460.5450.5470.5470.5460.5450.5450.5450.3270.3260.3260.3250.3240.3280.3360.3360.3350.3340.3340.3340.3330.3330.3320.3320.2210.2210.2210.2210.2210.220.220.22NA0.22NANA
us-gaap:AdditionalPaidInCapitalCommonStock ▆▆▆▆▅▄▄▄▃▃▃▄▄▃▃▃▃▂▂▂▁▁▃██▇▇▇▆▆▆▆▅▅▅▅▅▅▄▄▄85.57885.01985.0784.38983.81679.7379.46578.8477.78976.68776.81479.30478.36676.91576.41375.95175.7474.89174.17573.02471.40570.48176.46891.37190.97588.79387.3786.99286.78785.70885.07783.96983.65282.91882.67982.0981.83481.13880.07879.65979.324NA78.428NANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇██▇▇▇▇▇▇▆▆▆▆▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▁▂▂▁▁▁▁567.234549.131534.436559.492545.031529.102517.577503.47524.055510.504498.595484.219470.329457.993448.542384.83378.339370.234362.837355.35347.727340.007332.625324.659317.089309.573300.222292.088285.271278.18273.727267.258260.111253.109246.46255.875249.909242.877237.872230.649224.756NA215.345NANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁0.930.336NA0.3920.7260.246NA0.3930.6360.3661.2210.8920.8890.3210.3340.1860.5810.1490.1420.0730.3780.290.2150.3330.5830.2730.2010.1090.40.2110.2220.2110.4340.2170.1780.2560.5430.2480.419NANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▅▄▇█▅▄▆▄▄▅▆▆▂▃▃▃▅▃▃▃▇▃▃▂▇▃▂▁▃▂▂▃▂▂▂▂▂▃▂▁▃▂▂39.79543.5734.89150.6460.58743.4833.5746.10136.70636.80338.52644.72244.19323.18227.16929.4927.54637.67429.42524.0225.05655.06526.81629.64618.61453.16223.58817.68813.18727.50823.33818.03925.81621.99422.7522.77720.23319.77925.46218.28814.46527.99118.60921.945NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▆▇▄▆▄▃▂▄█▇▅▅▅▇▄▅▆▅▅▅▇▆▁▄█▆▅▃▆▇▇▃▇▇▆▄▇▆▇██▇▄-44.021-17.417-12.577-34.558-22.558-36.632-41.151-51.9-38.267-5.911-12.428-29.665-31.785-27.392-11.303-37.05-26.003-20.962-28.448-29.164-30.125-9.553-21.555-60.191-36.573-6.762-23.403-25.67-48.149-21.384-9.994-10.312-41.331-13.085-10.509-22.302-40.131-15.173-24.199-12.193-7.012-4.867-9.872-33.822NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▁▅▆▅▅▂▅▅▅▅▅▅▅▅▅▅▅▆▆▁▅█▅▃▅▆▇▅▅▅▆▅▄▅▅▅▅▅▅▃▅▇-3.685-3.697-44.466-3.1261.158-2.173-1.438-36.513-1.173-2.129-5.074-1.321-0.803-1.183-1.234-1.339-0.55-8.135-0.6645.1114.121-44.79-4.97226.1910.758-24.823-0.2497.21316.603-0.459-0.766-7.297.109-3.341-13.895-0.597-0.4910.211-0.956-0.584-0.491-20.389-7.80112.684NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▃▆▁▅█▄▂-7.91122.456-22.15212.95639.1874.675-9.019NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:DeferredIncomeTaxExpenseBenefit ▆▆▆▇▆▇▇▇▇▆▆▇▇▆▁▇▆▇▇▇▇▇█▆▇▇█▆▆▆▆▇▇▇▆▆▆▇▇▆▇▇▇▇1.1291.085-4.7922.605-0.5051.7689.5683.8761.7820.819-1.7193.8552.1651.05-49.221.8-3.2243.4163.2443.4163.153.6815.103-4.9952.3062.30613.217-5.9461.0751.076-0.3921.5651.5661.5641.0991.1120.7111.92.0330.7694.4172.8576.6215.62NA
 us-gaap:DepreciationDepletionAndAmortization us-gaap:StatementBusinessSegments mrtn:Dedicated█████▇▇▇▆▆▆▆▅▅▄▄▄▄▄▄▄▄▃▃▂▂▂▂▁▁10.710.710.710.510.39.99.29.08.67.87.77.87.46.75.65.65.45.35.35.25.15.04.64.33.22.92.62.31.81.5NANANANANANANANANANANANANANANA
 us-gaap:DepreciationDepletionAndAmortization us-gaap:StatementBusinessSegments mrtn:Intermodal█▇▇▆▅▆▆▄▄▅▆▆▆▅▄▄▃▃▂▂▁▁▃▆▆▇▇██▆1.61.51.50000000000000041.41.31.41.41.21.21.31.41.41.41.31.21.21.11.11.00.9950.9870.9411.11.41.41.51.51.61.61.4NANANANANANANANANANANANANANANA
 us-gaap:DepreciationDepletionAndAmortization us-gaap:StatementBusinessSegments mrtn:Truckload▆▆▆▆▇▆▇▆▆▆▆▆▆▆▇▇▇▇▇▇▇▆▆▆▆▆▁██▇▇██▇▇▇▇▆▇▇▆12.913.213.413.414.013.813.913.713.413.112.812.813.113.514.114.114.414.614.514.113.913.713.713.313.513.27.715.515.114.814.815.015.014.514.714.314.013.614.314.013.3NANANANA
us-gaap:IncreaseDecreaseInAccountsPayable ▃▄▃▄▄▄▆▅▂▅▃▃█▁-0.2850.677-0.4320.3640.3340.6173.491.682-2.0112.098-0.36-0.5236.254-3.571NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▅▄▇█▅▄▆▄▄▅▆▆▂▃▃▃▅▃▃▃▇▃▃▂▇▃▂▁▃▂▂▃▂▂▂▂▂▃▂▁▃▂▂39.79543.5734.89150.6460.58743.4833.5746.10136.70636.80338.52644.72244.19323.18227.16929.4927.54637.67429.42524.0225.05655.06526.81629.64618.61453.16223.58817.68813.18727.50823.33818.03925.81621.99422.7522.77720.23319.77925.46218.28814.46527.99118.60921.945NA
us-gaap:NetIncomeLoss ▃▃▃▃▃▂▂▂▂▂▂▂▂▂█▁▂▁▁▁▂▁▂▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁21.41818.00619.60418.04418.13413.71815.74816.58715.1913.54615.73715.25713.70210.33165.0747.8559.1418.2148.3038.4378.5318.1938.798.418.35710.1888.9697.6527.9265.2877.3017.9777.6677.2027.7196.5187.5845.4467.6636.3336.1944.0955.215.4825.158
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▆▇▄▆▄▃▂▄█▇▅▅▅▇▄▅▆▅▅▅▇▆▁▄█▆▅▃▆▇▇▃▇▇▆▄▇▆▇██▇▄-44.021-17.417-12.577-34.558-22.558-36.632-41.151-51.9-38.267-5.911-12.428-29.665-31.785-27.392-11.303-37.05-26.003-20.962-28.448-29.164-30.125-9.553-21.555-60.191-36.573-6.762-23.403-25.67-48.149-21.384-9.994-10.312-41.331-13.085-10.509-22.302-40.131-15.173-24.199-12.193-7.012-4.867-9.872-33.822NA
 us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType mrtn:BuildingsAndLandOfficeEquipmentAndOther▁▁▂▁▁▂▁▁▁▁▁▁▁▂▃▁▁▁▂▂▁▁▁▂▂▂▂▂█▂0.471.051.961.2211.511.9661.3011.1740.9921.2560.9640.611.1774.6115.1360.5231.2910.7431.9532.6521.5661.1981.6983.5043.9854.2953.0153.03121.1573.682NANANANANANANANANANANANANANANA
 us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType mrtn:RevenueEquipment█▃▃▇▃▅▆▇▅▁▃▅▅▄▁▆▅▃▅▅▅▂▄█▅▂▃▄▄▃68.65130.22627.93862.99431.37744.08657.52466.37247.62513.15930.30445.53147.62937.69613.84658.843.41332.79743.48145.49447.14418.86534.37771.26448.16420.3628.89336.63738.57227.543NANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▁▅▆▅▅▂▅▅▅▅▅▅▅▅▅▅▅▆▆▁▅█▅▃▅▆▇▅▅▅▆▅▄▅▅▅▅▅▅▃▅▇-3.685-3.697-44.466-3.1261.158-2.173-1.438-36.513-1.173-2.129-5.074-1.321-0.803-1.183-1.234-1.339-0.55-8.135-0.6645.1114.121-44.79-4.97226.1910.758-24.823-0.2497.21316.603-0.459-0.766-7.297.109-3.341-13.895-0.597-0.4910.211-0.956-0.584-0.491-20.389-7.80112.684NA
us-gaap:PaymentsOfDividendsCommonStock ▁▁█▁▁▁▁▇▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▄▁▁▁▁▁▁▁▁3.3153.31144.6613.3072.2052.1931.64137.1721.6391.6371.3611.3671.3661.3651.3623.00.8180.8170.8160.8140.8110.8110.8240.840.8410.8370.8350.8350.8350.8340.8320.830.5540.55317.1340.5520.5520.4410.440.440.4390.4390.439NANA
us-gaap:PaymentsForRepurchaseOfCommonStock NANA0.00.00.00.597NANA0.0-0.0NANANANANANANANA0.00.00.07.513NANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value829000.0828000.0827000.0827000.0551000.0548000.0547000.0547000.0546000.0546000.0545000.0547000.0547000.0546000.0545000.0545000.0545000.0327000.0326000.0326000.0325000.0324000.0328000.0336000.0336000.0335000.0334000.0334000.0334000.0333000.0333000.0332000.0332000.0221000.0221000.0221000.0221000.0221000.0220000.0220000.0220000.0220000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.00.00.00.0

Common Stock Par Or Stated Value Per Share

us-gaap:CommonStockParOrStatedValuePerShare us-gaap:StatementScenario, us-gaap:NonmonetaryTransactionType

us-gaap:CommonStockParOrStatedValuePerShare

srt:ScenarioForecast, mrtn:StockSplit


Common
Period End2020-08-13
Value0.01
Percentage of CommonStockParOrStatedValuePerShare100.0

Shares Outstanding

us-gaap:SharesOutstanding us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

us-gaap:CommonStock


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value828282825554545454545454545454545454545455
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementScenario, us-gaap:NonmonetaryTransactionType

us-gaap:CommonStockSharesOutstanding

srt:ScenarioForecast, mrtn:StockSplit


Common
Period End2020-08-132020-08-12
Value8255
Percentage of CommonStockSharesOutstanding100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value83838355555555555555555454323232323333333333333333222222222222
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value82828255545454545454545454323232323333333333333333222222222121
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
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
Value930000.0336000.0487000.0392000.0726000.0246000.0422000.0393000.0636000.0366000.01221000.0892000.0889000.0321000.0334000.0186000.0581000.0149000.0142000.073000.0378000.0290000.0215000.0333000.0583000.0273000.0201000.0109000.0400000.0211000.0222000.0211000.0434000.0217000.0178000.0256000.0543000.0248000.0419000.0335000.0357000.0238000.0463000.0341000.0
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.20.20.20.30.10.20.20.30.20.60.40.50.20.20.10.30.10.10.00.20.20.10.20.40.20.10.10.20.10.10.10.30.10.10.20.30.20.30.20.20.20.00.3

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2824252425181920201819191813141315131414141315141417
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax12.310.811.211.311.98.38.89.49.69.09.79.69.37.47.87.69.08.08.28.58.88.68.98.38.710.7

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value7.1096.0025.9676.3737.1354.4113.3013.7025.1494.4654.0353.8564.6593.452-50.855.1536.3035.5835.7876.096.0085.7176.2225.8185.7987.1087.1545.6165.6183.4515.4765.8065.6075.2675.473.2675.4673.9335.2074.4784.9193.3583.594.1524.008
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.12.72.63.03.42.01.51.72.42.22.01.92.41.8-27.83.03.73.23.43.63.63.53.73.43.54.44.13.33.32.23.33.53.53.23.32.03.52.63.32.93.32.40.03.23.2

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value6.9691.35124.5560.9870.00.5060.3042.7611.3826.7211.9570.3850.4633.3243.1397.6020.292.6261.0363.303-6.9346.5722.9894.705-12.1456.7658.2369.4182.3473.1755.2614.0573.6972.1132.4563.5880.6793.918
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.00.65.52.10.50.00.20.11.30.73.31.00.20.21.81.84.40.21.50.62.0-4.33.91.72.9-7.53.94.85.61.51.93.12.52.21.31.52.30.42.5

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2118191818131516151315151310657.8559.1418.2148.3038.4378.5318.1938.798.418.357108.9697.6527.9265.2877.3017.9777.6677.2027.7196.5187.5845.4467.6636.3336.1944.0955.215.4825.158
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.28.18.68.48.56.37.37.77.26.87.77.67.05.535.64.65.34.74.84.95.15.15.24.95.16.35.24.54.73.34.44.84.74.44.64.04.83.64.84.14.13.00.04.34.1

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value211818181316151315151310657.8559.1418.2148.3038.4378.5318.1938.798.418.357108.9697.6527.9265.2877.3017.9777.6677.2027.7196.5187.5845.4467.6636.3336.1944.0955.215.482
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.28.18.48.56.37.77.26.87.77.67.05.535.64.65.34.74.84.95.15.15.24.95.16.35.24.54.73.34.44.84.74.44.64.04.83.64.84.14.13.00.04.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value9000.010000.013000.017000.013000.097000.0262000.0255000.0395000.0278000.0234000.0120000.0138000.0189000.0-109000.0-14000.0-125000.0-141000.0-443000.0-342000.0-237000.0-215000.0-225000.0-126000.0-6000.0-15000.0-269000.0226000.0612000.098000.094000.0130000.0153000.015000.08000.06000.013000.0
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.10.10.20.10.10.10.10.1-0.1-0.0-0.1-0.1-0.3-0.2-0.1-0.1-0.1-0.1-0.0-0.0-0.20.10.40.10.10.10.10.00.00.00.0

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value203199201191187200198194192181184180178173168157155159158155151147153156149143157158155150153153148151153153143141145145139130127118116
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax87.789.288.888.788.191.891.390.790.691.190.490.590.892.792.292.490.992.091.691.391.191.391.091.691.389.390.692.492.394.692.491.891.992.492.194.091.593.791.892.992.594.50.092.292.7

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value28232524251818201917191818131413151314141414151414171613128.6412131312139.84139.5191211117.6099.0769.9869.193
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax12.310.811.211.311.98.28.79.39.48.99.69.59.27.37.87.69.18.08.48.78.98.79.08.48.710.79.47.67.75.47.68.28.17.67.96.08.56.38.27.17.55.50.07.87.3

us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments

mrtn:Brokerage


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2.8542.1862.2221.5261.8141.4082.0951.9482.6632.2691.581.2111.4381.3131.7311.1560.9441.3281.1731.210.8690.9321.161.0690.8210.7420.6970.6920.6060.657
Percentage of OperatingIncomeLoss10.09.18.76.37.27.811.29.713.412.88.16.47.99.712.18.96.19.58.18.15.96.67.67.45.84.34.35.34.77.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.21.01.00.70.90.61.00.91.31.10.80.60.70.70.90.70.60.80.70.70.50.60.70.60.50.50.40.40.40.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:Brokerage0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:Dedicated


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value108.9369.911118.5338.119.927.75.5155.2685.2495.5842.4882.9994.5145.0744.4874.5875.5055.1344.3244.3223.9292.5632.0042.3352.0461.4331.322
Percentage of OperatingIncomeLoss37.237.238.745.245.347.343.249.538.631.127.027.630.618.320.934.732.632.231.637.034.730.628.427.418.111.614.215.711.115.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.64.04.45.15.43.93.74.63.62.82.62.62.81.31.62.63.02.62.73.23.12.72.62.31.61.21.31.20.90.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:Dedicated0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:Intermodal


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1.851.4612.1661.3040.9541.3061.4721.211.5362.3943.1532.5072.5122.9782.5261.5882.042.1491.7351.6451.8221.9291.461.1520.9691.2510.92-0.1510.4830.483
Percentage of OperatingIncomeLoss6.56.18.55.33.87.27.86.07.713.516.113.213.821.917.612.213.115.411.911.112.313.79.68.06.87.25.6-1.23.75.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.80.71.00.60.40.60.70.60.71.21.51.31.31.61.40.91.21.21.01.01.11.20.90.70.60.80.5-0.10.30.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:Intermodal0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:Truckload


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value13111110116.7857.116.9568.0457.5559.537108.6896.8157.0775.7647.5115.9747.0386.5096.9516.947.9038.2049.8089.6027.63912117.511121110.0107.938107.128119.1749.602
Percentage of OperatingIncomeLoss46.347.644.143.243.737.637.834.740.342.648.852.847.750.149.444.348.242.948.443.847.049.151.957.269.355.546.695.991.686.888.589.886.779.881.580.782.674.986.582.684.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.75.15.04.95.23.13.33.23.83.84.75.04.43.63.93.44.43.54.13.84.24.34.74.86.06.04.47.37.04.76.87.37.06.16.54.97.04.77.15.96.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:Truckload0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value232223227216212218217214212199203199197186182170171173172170166161168171163161173171168159166167161164166163156151158156151137136128125
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value232223227216212218217214212199203199197186182170171173172170166161168171163161173171168159166167161164166163156151158156151137136128125
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

mrtn:FuelSurchargeRevenue, mrtn:Dedicated


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value12119.679.3358.351101111108.80110109.7396.4693.9162.9952.9013.3783.1882.9672.6211.5872.6772.9372.8032.5913.6813.9953.2452.822
Percentage of Revenues5.55.14.34.33.95.05.25.15.14.45.05.24.93.52.11.81.72.01.81.71.61.01.61.71.71.62.12.31.91.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.55.14.34.33.95.05.25.15.14.45.05.24.93.52.11.81.72.01.81.71.61.01.61.71.71.62.12.31.91.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:FuelSurchargeRevenue mrtn:Dedicated0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:FuelSurchargeRevenue, mrtn:Intermodal


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value3.5612.5581.9591.9851.7593.0863.3912.9613.0763.2164.2264.2044.1793.8443.2542.4722.2382.3751.9921.9791.6641.3472.092.673163.3734.7165.793205.336
Percentage of Revenues1.51.10.90.90.81.41.61.41.51.62.12.12.12.11.81.41.31.41.21.21.00.81.21.69.82.12.73.412.13.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.51.10.90.90.81.41.61.41.51.62.12.12.12.11.81.41.31.41.21.21.00.81.21.69.82.12.73.412.13.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:FuelSurchargeRevenue mrtn:Intermodal0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:FuelSurchargeRevenue, mrtn:Truckload


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value12108.7338.5498.23411121212111213131212101010109.7268.9337.1129.96411131420212323
Percentage of Revenues5.34.93.84.03.95.25.75.66.05.86.46.77.06.86.76.06.16.35.95.75.44.45.96.98.59.011.912.714.114.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.34.93.84.03.95.25.75.66.05.86.46.77.06.86.76.06.16.35.95.75.44.45.96.98.59.011.912.714.114.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:FuelSurchargeRevenue mrtn:Truckload0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:RevenueNetOfFuelSurcharge, mrtn:Dedicated


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value676671696764595956484948474239393836373736353331221918151110
Percentage of Revenues28.930.031.431.931.629.327.427.626.524.624.024.324.022.721.422.922.521.321.522.122.121.919.718.413.812.310.59.27.06.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax28.930.031.431.931.629.327.427.626.524.624.024.324.022.721.422.922.521.321.522.122.121.919.718.413.812.310.59.27.06.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:RevenueNetOfFuelSurcharge mrtn:Dedicated0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:RevenueNetOfFuelSurcharge, mrtn:Intermodal


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2219201918202119171921212120191716161616161515172.9451717195.818
Percentage of Revenues9.58.79.29.38.79.49.79.08.39.910.710.910.811.110.510.29.89.79.49.69.79.89.210.01.810.610.111.23.411.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.58.79.29.38.79.49.79.08.39.910.710.910.811.110.510.29.89.79.49.69.79.89.210.01.810.610.111.23.411.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:RevenueNetOfFuelSurcharge mrtn:Intermodal0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:RevenueNetOfFuelSurcharge, mrtn:Truckload


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value838387858583828283808180808085818484868585828586888691899086
Percentage of Revenues36.037.638.539.440.538.438.238.639.240.339.740.440.942.946.847.949.349.050.150.151.251.250.950.554.353.852.952.253.654.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax36.037.638.539.440.538.438.238.639.240.339.740.440.942.946.847.949.349.050.150.151.251.250.950.554.353.852.952.253.654.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:RevenueNetOfFuelSurcharge mrtn:Truckload0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:StatementBusinessSegments

mrtn:Brokerage


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-03-31
Value3027272222242627282624202020191615181716141719181617171511
Percentage of Revenues13.212.512.010.210.611.312.212.713.413.412.110.510.210.910.89.79.310.410.29.59.010.911.410.910.010.69.89.07.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.212.512.010.210.611.312.212.713.413.412.110.510.210.910.89.79.310.410.29.59.010.911.410.910.010.69.89.07.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:Brokerage0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:Dedicated


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value807880787575707067575958564842424140404039373634252221191513
Percentage of Revenues34.535.135.636.335.534.332.732.731.629.029.129.428.926.123.524.724.223.323.423.823.622.921.320.115.513.912.711.59.08.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax34.535.135.636.335.534.332.732.731.629.029.129.428.926.123.524.724.223.323.423.823.622.921.320.115.513.912.711.59.08.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:Dedicated0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:Intermodal


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-03-31
Value2522222120232422202225252524221919191818171717191920222523
Percentage of Revenues11.09.910.010.29.610.811.310.49.711.512.713.012.913.212.311.711.111.110.510.810.710.610.511.611.612.612.814.614.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.09.910.010.29.610.811.310.49.711.512.713.012.913.212.311.711.111.110.510.810.710.610.511.611.612.612.814.614.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:Intermodal0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mrtn:Truckload


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value959496939495959496919393949397929495969594909598102101112111114110
Percentage of Revenues41.342.642.343.344.443.543.944.245.346.146.147.047.949.853.453.955.355.255.955.856.655.656.857.462.862.964.864.967.769.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax41.342.642.343.344.443.543.944.245.346.146.147.047.949.853.453.955.355.255.955.856.655.656.857.462.862.964.864.967.769.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax mrtn:Truckload0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value884855831859840824796780796774753745724711690676670661653645627610631629614580579566562536525518520508490501494490470467461460
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value230220211214211215198198194186177181175176164214215215216217208199222213206181191187189172166166176172158161160164150154154164
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.125.825.425.025.126.125.025.424.424.123.624.324.224.823.931.832.232.633.133.633.232.735.233.933.631.333.133.033.832.131.732.233.933.832.332.132.433.531.933.133.535.7

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value884855831859840824796780796774753745724711690676670661653645627610631629614580579566562536525518520508490501494490470467461460
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value653634620644629609597582602587575564549535525437359351344336329338331324318310304293
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets73.974.274.675.074.973.975.074.675.675.976.475.775.875.276.166.968.367.866.166.267.167.467.166.067.666.466.063.9

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value85858584837979787776767978767674
Percentage of StockholdersEquity13.113.413.713.113.313.113.313.512.913.013.314.114.314.414.517.0
Percentage of Assets9.79.910.29.810.09.710.010.19.89.910.210.610.810.811.111.3
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0.8290.8280.8270.8270.5510.5480.5470.5470.5460.5460.5450.5470.5470.5460.5450.544
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value567549534559545529517503524510498484470457448362
Percentage of StockholdersEquity86.886.586.286.886.686.886.686.487.086.986.685.885.685.585.482.9
Percentage of Assets64.164.264.365.164.864.165.064.565.865.966.165.064.964.365.055.5
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value201201175192194159154147192193163145134118116941009993908687100931011121109510010810794899795949110610110510187
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.823.521.122.423.219.319.418.924.225.021.719.518.616.716.914.015.015.114.314.013.814.415.814.916.519.319.016.817.820.320.418.317.219.119.518.818.521.621.622.522.019.1

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value8088668875363140828556352210151.159109.0650.4880.1750.2081.1560.4340.1454.499210.1230.1870.95619131.0720.6359.0413.4735.1275.249252020158.0415.3064.373.5635.412.395
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.110.48.010.39.04.43.95.210.411.07.54.83.01.52.30.21.51.40.10.00.00.20.10.00.73.70.00.00.23.62.60.20.11.80.71.01.15.24.44.43.30.01.20.00.00.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value928983808394908587848384858274726769696966657070686872737570707268656668645859626451
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.510.510.09.410.011.411.410.910.910.911.011.311.811.510.810.810.010.610.610.810.510.711.211.211.211.812.512.913.413.113.514.013.213.013.513.713.011.912.613.414.011.1

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3103000.03166000.02971000.02786000.02906000.02408000.02734000.02606000.02652000.02946000.0
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.40.50.50.50.6

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-01-012017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value23192120221920181918192219191816151515
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.72.32.62.42.72.32.62.42.52.32.60.02.93.02.92.92.93.23.3

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value947934930943920937904891857819816820805808783781775768759754744723724724700651645583588560484556547531468513509515
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets107.1109.2111.8109.8109.5113.6113.5114.1107.6105.8108.3110.1111.2113.6113.5115.5115.6116.3116.2116.8118.6118.5114.7115.0113.9112.2111.4112.5113.0110.298.7110.8110.8108.399.7109.9110.5112.0

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

mrtn:RevenueEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value787764679652634606535496484
Percentage of PropertyPlantAndEquipmentGross84.784.583.283.383.683.782.80.0100.0
Percentage of Assets94.796.090.294.697.196.092.394.498.7
Percentage of Assets mrtn:RevenueEquipment0.00.00.00.00.00.00.00.00.0

us-gaap:LandAndBuilding


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value908885797573715239
Percentage of PropertyPlantAndEquipmentGross9.79.810.510.29.910.111.00.08.2
Percentage of Assets10.811.111.411.611.611.612.39.98.1
Percentage of Assets us-gaap:LandAndBuilding0.00.00.00.00.00.00.00.00.0

us-gaap:OfficeEquipment


Property
Period End2020-12-312019-12-31
Value5251
Percentage of PropertyPlantAndEquipmentGross5.65.7
Percentage of Assets6.36.5
Percentage of Assets us-gaap:OfficeEquipment0.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value266281275278276274263261256241228223218217211201206209201202206204196192190186180174174171164163160152156149145147155151150143
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.132.933.232.432.933.233.133.532.231.230.329.930.130.630.729.930.931.630.931.332.933.531.130.531.032.131.130.931.132.031.431.530.829.931.929.729.430.033.132.532.731.2

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value680652654664644663640629600578588597587591571579568559557552537519528532509464465467458424415420427407394407402384368362359372
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets77.076.378.777.476.680.480.480.775.474.678.080.281.183.082.885.784.784.685.385.585.785.083.684.582.980.180.382.581.579.178.981.182.280.380.481.181.478.378.277.477.980.8

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherNoncurrentAssets


Operating
Period End2020-12-312019-12-31
Value918000.01178000.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0
Percentage of Assets0.10.1
Percentage of Assets us-gaap:OtherNoncurrentAssets0.00.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1694000.01698000.01805000.01950000.01916000.02029000.02026000.03204000.03107000.03109000.02146000.02281000.02169000.02062000.01865000.01856000.01854000.01966000.02493000.02881000.03168000.03356000.03469000.03572000.03606000.03581000.03726000.03923000.03991000.03489000.03443000.03527000.03359000.03206000.0613000.0606000.0597000.0588000.0579000.0570000.0561000.0543000.0
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.20.30.40.40.40.30.30.30.30.30.30.30.30.40.40.50.50.50.60.60.60.60.70.70.70.70.70.60.60.10.10.10.10.10.10.10.1

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value39322524263422272418151614121719161717
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.43.73.12.93.14.22.93.63.02.42.12.42.21.92.93.73.33.83.9

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312012-03-312011-12-312010-12-31
Value242128212621123842421916441512
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.92.73.73.14.13.42.26.87.57.93.73.59.13.32.8

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1069789878791768485797173717464656764606462614965785644525757535156614654535846515168
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.111.410.810.210.411.09.610.910.710.39.59.99.810.59.39.610.19.89.39.910.010.17.910.312.89.87.79.310.210.710.110.010.912.19.610.810.912.09.910.911.214.9

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiabilityCurrent

mrtn:AccruedAndOtherCurrentLiabilities


Operating
Period End2020-12-312019-12-31
Value507000.0529000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0
Percentage of Assets0.10.1
Percentage of Assets mrtn:AccruedAndOtherCurrentLiabilities0.00.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2.8812.9464.2141.8533.7181.9840.9020.561314130.96713121413141517
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.60.30.60.30.20.12.72.72.70.22.72.52.92.83.23.33.8

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value123122121125123123122105
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.914.314.614.714.715.015.314.1

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value421000.0337000.0411000.0521000.0572000.0622000.0649000.0714000.0451000.0452000.00
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.00.00.00.10.10.10.10.10.10.10.0

us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:BalanceSheetLocation

us-gaap:OtherNoncurrentLiabilities


Operating
Period End2020-12-312019-12-31
Value411000.0649000.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0
Percentage of Assets0.00.1
Percentage of Assets us-gaap:OtherNoncurrentLiabilities0.00.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value202000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value132000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiability

us-gaap:OtherLiabilities


Operating
Period End2020-12-312019-12-31
Value918000.01178000.0
Percentage of OperatingLeaseLiability100.0100.0
Percentage of Assets0.10.1
Percentage of Assets us-gaap:OtherLiabilities0.00.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-312020-09-302019-12-31
Value974000.01100000.01248000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0
Percentage of Assets0.10.10.2

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value56000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value653634620644629609597582602587575564549535525437359351344336329338331324318310304293
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets73.974.274.675.074.973.975.074.675.675.976.475.775.875.276.166.968.367.866.166.267.167.467.166.067.666.466.063.9

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value85858584837979787776767978767674
Percentage of StockholdersEquity13.113.413.713.113.313.113.313.512.913.013.314.114.314.414.517.0
Percentage of Assets9.79.910.29.810.09.710.010.19.89.910.210.610.810.811.111.3
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0.8290.8280.8270.8270.5510.5480.5470.5470.5460.5460.5450.5470.5470.5460.5450.544
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value567549534559545529517503524510498484470457448362
Percentage of StockholdersEquity86.886.586.286.886.686.886.686.487.086.986.685.885.685.585.482.9
Percentage of Assets64.164.264.365.164.864.165.064.565.865.966.165.064.964.365.055.5
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value653634620644629609597582602587575564549535525461454445437428419410409416408398387379372364359351344336331340334326320313306300295290285274257
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets73.974.274.675.074.973.975.074.675.675.976.475.775.875.276.168.267.867.466.966.466.867.364.866.166.468.766.967.066.267.968.367.866.166.267.767.967.666.568.166.966.50.064.30.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value829000.0828000.0827000.0827000.0551000.0548000.0547000.0547000.0546000.0546000.0545000.0547000.0547000.0546000.0545000.0545000.0545000.0327000.0326000.0326000.0325000.0324000.0328000.0336000.0336000.0335000.0334000.0334000.0334000.0333000.0333000.0332000.0332000.0221000.0221000.0221000.0221000.0221000.0220000.0220000.0220000.0220000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value858585848379797877767679787676757574747371707691908887868685858383828282818180797978
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.79.910.29.810.09.710.010.19.89.910.210.610.810.811.111.211.311.311.311.311.411.512.114.514.815.315.115.415.416.016.216.216.116.316.916.416.516.517.017.017.217.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value567549534559545529517503524510498484470457448384378370362355347340332324317309300292285278273267260253246255249242237230224215
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets64.164.264.365.164.864.165.064.565.865.966.165.064.964.365.056.956.456.055.555.055.455.752.751.551.653.351.851.650.751.952.151.650.049.850.251.050.549.550.549.348.746.8

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value930000.0336000.0392000.0726000.0246000.0393000.0636000.0366000.01221000.0892000.0889000.0321000.0334000.0186000.0581000.0149000.0142000.073000.0378000.0290000.0215000.0333000.0583000.0273000.0201000.0109000.0400000.0211000.0222000.0211000.0434000.0217000.0178000.0256000.0543000.0248000.0419000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value930000.0336000.0392000.0726000.0246000.0393000.0636000.0366000.01221000.0892000.0889000.0321000.0334000.0186000.0581000.0149000.0142000.073000.0378000.0290000.0215000.0333000.0583000.0273000.0201000.0109000.0400000.0211000.0222000.0211000.0434000.0217000.0178000.0256000.0543000.0248000.0419000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3943345060433346363638444423272927372924255526291853231713272318252122222019251814271821
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax17.119.515.323.428.519.915.521.417.318.518.922.422.412.414.917.316.121.817.014.115.134.015.917.311.433.013.610.37.817.314.010.816.013.413.713.912.913.116.111.79.620.313.617.1

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-44021000.0-17417000.0-12577000.0-34558000.0-22558000.0-36632000.0-41151000.0-51900000.0-38267000.0-5911000.0-12428000.0-29665000.0-31785000.0-27392000.0-11303000.0-37050000.0-26003000.0-20962000.0-28448000.0-29164000.0-30125000.0-9553000.0-21555000.0-60191000.0-36573000.0-6762000.0-23403000.0-25670000.0-48149000.0-21384000.0-9994000.0-10312000.0-41331000.0-13085000.0-10509000.0-22302000.0-40131000.0-15173000.0-24199000.0-12193000.0-7012000.0-4867000.0-9872000.0-33822000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-18.9-7.8-5.5-16.0-10.6-16.8-18.9-24.1-18.0-3.0-6.1-14.9-16.1-14.7-6.2-21.7-15.2-12.1-16.5-17.1-18.1-5.9-12.8-35.1-22.4-4.2-13.5-15.0-28.6-13.4-6.0-6.2-25.6-8.0-6.3-13.6-25.6-10.0-15.3-7.8-4.6-3.5-7.2-26.3

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-3.685-3.697-44.466-3.1261.158-2.173-1.438-36.513-1.173-2.129-5.074-1.321-0.803-1.183-1.234-1.339-0.55-8.135-0.6645.1114.121-44.79-4.972260.758-24.823-0.2497.21316-0.459-0.766-7.297.109-3.341-13.895-0.597-0.4910.211-0.956-0.584-0.491-20.389-7.80112
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.6-1.7-19.6-1.40.5-1.0-0.7-17.0-0.6-1.1-2.5-0.7-0.4-0.6-0.7-0.8-0.3-4.7-0.43.02.5-27.7-2.915.30.5-15.4-0.14.29.9-0.3-0.5-4.44.4-2.0-8.3-0.4-0.30.1-0.6-0.4-0.3-14.8-5.79.9

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-7.91122-22.15212394.675-9.019
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-3.410.1-9.76.018.52.1-4.2

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1.1291.085-4.7922.605-0.5051.7689.5683.8761.7820.819-1.7193.8552.1651.05-49.221.8-3.2243.4163.2443.4163.153.6815-4.9952.3062.30613-5.9461.0751.076-0.3921.5651.5661.5641.0991.1120.7111.92.0330.7694.4172.8576.6215.62
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization us-gaap:StatementBusinessSegments

us-gaap:DepreciationDepletionAndAmortization

mrtn:Dedicated


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value10101010109.99.29.08.67.87.77.87.46.75.65.65.45.35.35.25.15.04.64.33.22.92.62.31.81.5
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:Intermodal


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1.61.51.50000000000000041.41.31.41.41.21.21.31.41.41.41.31.21.21.11.11.00.9950.9870.9411.11.41.41.51.51.61.61.4
Percentage of DepreciationDepletionAndAmortization15.014.014.013.312.614.115.213.314.016.718.217.918.919.421.421.420.420.818.919.119.418.823.932.643.851.757.769.688.993.3

mrtn:Truckload


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value12131313141313131313121213131414141414141313131313137.71515141415151414141413141413
Percentage of DepreciationDepletionAndAmortization120.6123.4125.2127.6135.9139.4151.1152.2155.8167.9166.2164.1177.0201.5251.8251.8266.7275.5273.6271.2272.5274.0297.8309.3421.9455.2296.2673.9838.9986.70.00.00.00.00.00.00.00.00.00.00.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-285000.0677000.0-432000.0364000.0334000.0617000.03490000.01682000.0-2011000.02098000.0-360000.0-523000.06254000.0-3571000.0
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3943345060433346363638444423272927372924255526291853231713272318252122222019251814271821
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax17.119.515.323.428.519.915.521.417.318.518.922.422.412.414.917.316.121.817.014.115.134.015.917.311.433.013.610.37.817.314.010.816.013.413.713.912.913.116.111.79.620.313.617.1

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2118191818131516151315151310657.8559.1418.2148.3038.4378.5318.1938.798.418.357108.9697.6527.9265.2877.3017.9777.6677.2027.7196.5187.5845.4467.6636.3336.1944.0955.215.4825.158
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.28.18.68.48.56.37.37.77.26.87.77.67.05.535.64.65.34.74.84.95.15.15.24.95.16.35.24.54.73.34.44.84.74.44.64.04.83.64.84.14.13.03.84.34.1

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value211818181316151315151310657.8559.1418.2148.3038.4378.5318.1938.798.418.357108.9697.6527.9265.2877.3017.9777.6677.2027.7196.5187.5845.4467.6636.3336.1944.0955.215.482
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.28.18.48.56.37.77.26.87.77.67.05.535.64.65.34.74.84.95.15.15.24.95.16.35.24.54.73.34.44.84.74.44.64.04.83.64.84.14.13.03.84.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-44021000.0-17417000.0-12577000.0-34558000.0-22558000.0-36632000.0-41151000.0-51900000.0-38267000.0-5911000.0-12428000.0-29665000.0-31785000.0-27392000.0-11303000.0-37050000.0-26003000.0-20962000.0-28448000.0-29164000.0-30125000.0-9553000.0-21555000.0-60191000.0-36573000.0-6762000.0-23403000.0-25670000.0-48149000.0-21384000.0-9994000.0-10312000.0-41331000.0-13085000.0-10509000.0-22302000.0-40131000.0-15173000.0-24199000.0-12193000.0-7012000.0-4867000.0-9872000.0-33822000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-18.9-7.8-5.5-16.0-10.6-16.8-18.9-24.1-18.0-3.0-6.1-14.9-16.1-14.7-6.2-21.7-15.2-12.1-16.5-17.1-18.1-5.9-12.8-35.1-22.4-4.2-13.5-15.0-28.6-13.4-6.0-6.2-25.6-8.0-6.3-13.6-25.6-10.0-15.3-7.8-4.6-3.5-7.2-26.3

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

mrtn:BuildingsAndLandOfficeEquipmentAndOther


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.471.051.961.2211.511.9661.3011.1740.9921.2560.9640.611.1774.6115.1360.5231.2910.7431.9532.6521.5661.1981.6983.5043.9854.2953.0153.031213.682
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:RevenueEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value683027623144576647133045473713584332434547183471482028363827
Percentage of PaymentsToAcquirePropertyPlantAndEquipment14606.62878.71425.45159.22077.92242.44421.55653.54800.91047.73143.67464.14046.6817.5269.611242.83362.74414.12226.41715.53010.51574.72024.62033.81208.6474.0958.31208.7182.3748.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-3.685-3.697-44.466-3.1261.158-2.173-1.438-36.513-1.173-2.129-5.074-1.321-0.803-1.183-1.234-1.339-0.55-8.135-0.6645.1114.121-44.79-4.972260.758-24.823-0.2497.21316-0.459-0.766-7.297.109-3.341-13.895-0.597-0.4910.211-0.956-0.584-0.491-20.389-7.80112
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.6-1.7-19.6-1.40.5-1.0-0.7-17.0-0.6-1.1-2.5-0.7-0.4-0.6-0.7-0.8-0.3-4.7-0.43.02.5-27.7-2.915.30.5-15.4-0.14.29.9-0.3-0.5-4.44.4-2.0-8.3-0.4-0.30.1-0.6-0.4-0.3-14.8-5.79.9

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value3.3153.311443.3072.2052.1931.641371.6391.6371.3611.3671.3661.3651.3623.00.8180.8170.8160.8140.8110.8110.8240.840.8410.8370.8350.8350.8350.8340.8320.830.5540.553170.5520.5520.4410.440.440.4390.4390.439
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-312016-12-312016-09-302016-06-302016-03-31
Value0.00.00.00.5970.0-0.00.00.00.07.513
Percentage of PaymentsForRepurchaseOfCommonStock0.00.00.0100.00.00.00.00.00.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value121122105100147134119110105101
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value4100000.03000000.01900000.0407000.0536000.0683000.0562000.0340000.0281000.0288000.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:AdjustmentsToAdditionalPaidInCapitalEmployeeTaxesPaidInExhangeForSharesWitheld

mrtn:AdjustmentsToAdditionalPaidInCapitalEmployeeTaxesPaidInExhangeForSharesWitheld


Adjustments
Period End2021-06-302021-03-312020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value706000.0547000.0437000.0784000.0000104000.000047000.0-254000.000127000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalEmployeeTaxesPaidInExhangeForSharesWitheld100.0100.0100.0100.00.00.00.0100.00.00.00.0100.0100.00.00.0100.0

mrtn:AdjustmentsToAdditionalPaidInCapitalEmployeeTaxesPaidInExhangeForSharesWitheld us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value706000.0547000.0437000.0784000.0000104000.000047000.0-254000.000127000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalEmployeeTaxesPaidInExhangeForSharesWitheld100.0100.0100.0100.00.00.00.0100.00.00.00.0100.0100.00.00.0100.0

mrtn:AmortizationExpenseForTiresInService

mrtn:AmortizationExpenseForTiresInService


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1621000.01642000.01638000.01609000.01622000.01706000.01796000.01719000.01686000.01660000.0
Percentage of AmortizationExpenseForTiresInService100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:CommunicationsAndUtilitiesExpense

mrtn:CommunicationsAndUtilitiesExpense


Communications
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2056000.02083000.02050000.01999000.01977000.01985000.01908000.01901000.01950000.01950000.01641000.01663000.01647000.0
Percentage of CommunicationsAndUtilitiesExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:FuelAndFuelTaxExpense

mrtn:FuelAndFuelTaxExpense


Fuel
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value32282424202831313027293131
Percentage of FuelAndFuelTaxExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:IncreaseDecreaseCapitalExpendituresIncurredButNotYetPaid

mrtn:IncreaseDecreaseCapitalExpendituresIncurredButNotYetPaid


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
Value5.085.5050.8758.34-17.09211-10.278-0.8916.3885.03-1.380.566-15.283121.685-6.42.0171.139-4.772.7496.4180.114-7.384-19.973245.315
Percentage of IncreaseDecreaseCapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:IncreaseDecreaseInAccruedOtherCurrentLiabilities

mrtn:IncreaseDecreaseInAccruedOtherCurrentLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value3280000.0-1200000.0-1263000.01533000.04292000.0-1290000.0-4621000.0-602000.01923000.0-3788000.01586000.03374000.0
Percentage of IncreaseDecreaseInAccruedOtherCurrentLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:OperatingLeaseAssetsAndLiabilitiesAcquired

mrtn:OperatingLeaseAssetsAndLiabilitiesAcquired


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value00088000.04000.0447000.082000.01135000.0
Percentage of OperatingLeaseAssetsAndLiabilitiesAcquired0.00.00.0100.0100.0100.0100.0100.0

mrtn:PurchasedTransportation

mrtn:PurchasedTransportation


Purchased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value454040373640414038383835353532282729282726282930282931323028303028343232292930312928302626
Percentage of PurchasedTransportation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:SuppliesAndMaintenanceExpense

mrtn:SuppliesAndMaintenanceExpense


Supplies
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value111111121112111211119.5921010
Percentage of SuppliesAndMaintenanceExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value252525252525242423222222222121212121212020201919181717171616161616151515151415141413131212
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value3.3153.3113.3072.2052.193371.6391.6371.3611.3671.3661.3651.3621.3640.8180.8170.8160.8140.8110.8110.8240.840.8410.8370.8350.8350.8350.8340.8320.830.5540.553172.538-0.552-0.4410.44-0.44-0.439-0.439-0.439
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value3.3153.3113.3072.2052.193371.6391.6371.3611.3671.3661.3651.3621.3640.8180.8170.8160.8140.8110.8110.8240.840.8410.8370.8350.8350.8350.8340.8320.830.5540.553172.538-0.552-0.4410.44-0.44-0.439-0.439-0.439
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDispositionOfAssets us-gaap:PropertyPlantAndEquipmentByType

us-gaap:GainLossOnDispositionOfAssets

mrtn:Facility


Gain
Period End2020-12-312020-09-302015-12-312015-09-302015-06-302015-03-31
Value0.01.7180.3920.00.03.712
Percentage of GainLossOnDispositionOfAssets0.0100.0100.00.00.0100.0

mrtn:RevenueEquipment


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value5.3391.9842.8342.1282.2161.5553.3432.5592.0381.8352.161.2110.6171.9081.8711.1033.043.3252.7031.4340.7411.8951.7871.1611.0271.4191.2780.663
Percentage of GainLossOnDispositionOfAssets0.00.00.0123.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0189.00.00.031.30.00.00.00.0

us-gaap:GeneralInsuranceExpense

us-gaap:GeneralInsuranceExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9.39111121111128.8469.6189.8629.875108.5678.941
Percentage of GeneralInsuranceExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInsuranceLiabilities

us-gaap:IncreaseDecreaseInInsuranceLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-274000.02117000.02966000.0795000.01410000.02695000.01082000.0-260000.01526000.01278000.02808000.0-279000.0
Percentage of IncreaseDecreaseInInsuranceLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value4870000.0-1445000.02276000.0-1481000.04728000.0-930000.01872000.0-1148000.01699000.0-1899000.01108000.0-1060000.0690000.0-624000.03547000.0-1372000.0533000.0-2205000.02592000.0-407000.0293000.0-1305000.02331000.0-109000.0744000.0-1692000.03379000.0-468000.0583000.0-1908000.02526000.0-1088000.0370000.0-1783000.02304000.0-3633000.0243000.01150000.0-2732000.049000.0-797000.01460000.0-2545000.017000.0
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3.3554.2414.121-2.083-15.5460.78212-1.382.4830.3150.028-0.7511.3197.5352.9096.256-2.42-0.771-0.2674.0050.995-13.2517.332-3.7647.167-18.70311-3.389.0-1.795-1.2474.4512.9670.307-2.96917-6.005-0.6934.721.855-9.123.792-2.322-2.395
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value557000.0601000.011000.0607000.0404000.0434000.013000.0479000.0465000.0493000.023000.0533000.0513000.0523000.034000.0373000.0309000.0188000.0-6000.0184000.0192000.0185000.0-23000.0224000.0271000.0303000.0-4000.0289000.0327000.0291000.025000.0249000.0168000.093000.0-7000.077000.0100000.0108000.0-4000.089000.0101000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense

us-gaap:LaborAndRelatedExpense


Labor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value757279747372726968636564635859535656565756545455504848464443434342424342393839373634343231
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherCostAndExpenseOperating


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value6.0855.3895.4425.3154.8056.1035.7295.95.9295.5665.8635.4355.5255.1744.4574.484.1413.4915.0074.7274.9855.0375.1744.9334.4534.2984.2644.1053.9513.6673.6013.5283.3473.6343.2413.4293.3673.543.4283.3853.5323.5413.1573.0512.78
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-1000.037000.000039000.000025000.0-13000.010000.09000.09000.09000.09000.09000.016000.09000.09000.08000.016000.09000.07000.09000.014000.010000.09000.09000.09000.08000.09000.0109000.0-91000.0-61000.09000.027000.0-9000.075000.09000.0-249000.0129000.0-24000.09000.0
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.00.00.00.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value706000.0547000.0000437000.0000784000.0000104000.000047000.0000127000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value336000.0161000.0195000.0181000.03363000.01054000.0203000.0659000.0466000.0292000.043000.046000.0563000.0286000.0128000.079000.0268000.0615000.0908000.01454000.0526000.01528000.01127000.060000.01330000.0973000.0159000.089000.0596000.0370000.0844000.0103000.0157000.022000.0352000.0075000.0541000.00
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

mrtn:BuildingsAndLandOfficeEquipmentAndOther


Proceeds
Period End2020-12-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-31
Value0.0080.010.0061.9690.00.0094.6160.011
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment100.0100.0100.0100.00.0100.0100.0100.0

mrtn:RevenueEquipment


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value25131727109.4591615108.529181617147.64122181216181810121415138.50413119.85
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment0.00.0216412.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0169850.0316416.70.00.0637.90.0173066.7287.977309.10.00.00.0

us-gaap:RelatedPartyTransactionAmountsOfTransaction us-gaap:NatureOfExpense

us-gaap:RelatedPartyTransactionAmountsOfTransaction

mrtn:TirePurchases


Related
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value300000.0500000.0283000.0917000.0500000.0629000.0416000.0155000.0500000.0600000.0962000.0438000.0600000.0400000.0400000.01100000.0500000.0572000.0449000.0479000.0400000.0472000.0409000.0219000.0300000.0394000.0468000.0238000.0300000.0554000.0439000.0307000.0
Percentage of RelatedPartyTransactionAmountsOfTransaction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationGross us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationGross

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value106000.070000.019000.0267000.0173000.054000.061000.0105000.04000.069000.057000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensationGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value336000.0161000.0181000.03363000.01054000.0659000.0466000.0292000.046000.0563000.0286000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value335000.0160000.0181000.03360000.01052000.0658000.0466000.0291000.046000.0562000.0285000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross99.799.4100.099.999.899.8100.099.7100.099.899.7

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-06-302019-03-312018-06-302018-03-31
Value1000.01000.04000.02000.01000.001000.01000.01000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross0.30.60.10.20.20.00.30.20.3

us-gaap:StockOptionPlanExpense

us-gaap:StockOptionPlanExpense


Stock
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value428000.0726000.0246000.0400000.0634000.0366000.0900000.0879000.0321000.0186000.0581000.0149000.073000.0378000.0290000.0344000.0583000.0273000.0109000.0400000.0211000.0211000.0434000.0217000.0209000.0543000.0248000.0335000.0
Percentage of StockOptionPlanExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-312016-09-302016-06-302016-03-312015-12-31
Value000035376.00000200000.0000000455580.0941020.0
Percentage of StockRepurchasedAndRetiredDuringPeriodShares0.00.00.00.0100.00.00.00.00.0100.00.00.00.00.00.00.0100.0100.0

us-gaap:TaxesAndLicenses

us-gaap:TaxesAndLicenses


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2.7182.7122.8372.7492.6152.6392.6782.6512.4382.3332.4182.4042.364
Percentage of TaxesAndLicenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:AccruedAndOtherLiabilitiesCurrent

mrtn:AccruedAndOtherLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value26242426252121262928
Percentage of AccruedAndOtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:AccruedExpenses

mrtn:AccruedExpenses


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value6.2996.7387.0918.212127.945.5366.4064.6496.616
Percentage of AccruedExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:LesseeOperatingLeaseLiabilityPaymentsDueYearFourAndFive

mrtn:LesseeOperatingLeaseLiabilityPaymentsDueYearFourAndFive


Lessee
Period End2020-12-31
Value116000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFourAndFive100.0

mrtn:LineOfCreditFacilityDividendRestrictionsPercentageOfNetIncomeLimit

mrtn:LineOfCreditFacilityDividendRestrictionsPercentageOfNetIncomeLimit


Line
Period End2020-11-302019-08-31
Value25.00.25
Percentage of LineOfCreditFacilityDividendRestrictionsPercentageOfNetIncomeLimit100.0100.0

mrtn:LineOfCreditFacilityWaiverToPayDividendsMaximum

mrtn:LineOfCreditFacilityWaiverToPayDividendsMaximum


Line
Period End2020-11-302019-08-31
Value6065
Percentage of LineOfCreditFacilityWaiverToPayDividendsMaximum100.0100.0

mrtn:StockholdersEquityNoteStockSplitDividendSettlementPercent us-gaap:NonmonetaryTransactionType

mrtn:StockholdersEquityNoteStockSplitDividendSettlementPercent

mrtn:StockSplit


Stockholders
Period End2020-08-13
Value50.0
Percentage of StockholdersEquityNoteStockSplitDividendSettlementPercent100.0

mrtn:StockSplitTo


Stockholders
Period End2020-08-13
Value50.0
Percentage of StockholdersEquityNoteStockSplitDividendSettlementPercent100.0

us-gaap:AccruedInsuranceCurrent

us-gaap:AccruedInsuranceCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-31
Value414139363534313030292825252526252120191717171614131413131514141313
Percentage of AccruedInsuranceCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedSalariesCurrent

us-gaap:AccruedSalariesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7584000.05438000.09744000.04171000.01839000.02644000.01204000.01415000.03773000.03956000.0
Percentage of AccruedSalariesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedVacationCurrent

us-gaap:AccruedVacationCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7733000.06558000.05895000.05621000.05353000.04782000.04301000.03872000.03560000.03154000.0
Percentage of AccruedVacationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value348000.0382000.0348000.0300000.0275000.0305000.0475000.0450000.0334000.0470000.0170000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-31
Value80886688753631405615
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNet us-gaap:BalanceSheetLocation

us-gaap:ContractWithCustomerAssetNet

us-gaap:PrepaidExpensesAndOtherCurrentAssets


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-03-312019-12-31
Value2500000.02400000.01500000.02200000.02200000.01700000.0
Percentage of ContractWithCustomerAssetNet100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:ContractWithCustomerAssetNetCurrent


Contract
Period End2020-12-312019-12-312018-12-31
Value1545000.01729000.01823000.0
Percentage of ContractWithCustomerAssetNetCurrent100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value134133116109159144-128.54119114108
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1311109.242119.948.8968.8478.4017.6
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value1768000.02464000.02313000.01965000.02757000.02721000.02847000.02796000.02714000.02274000.0
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value129.057.9867.2778.497.2196.0496.0515.6875.326
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3266000.02850000.02503000.02415000.03165000.03049000.0-2843000.02631000.02526000.02584000.0
Percentage of DeferredTaxLiabilitiesPrepaidExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value131130113107155141-125.697116111106
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

mrtn:UnvestedPerformanceUnitAwards


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value2200000.02400000.02400000.03900000.02600000.02400000.02200000.01400000.01300000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0

mrtn:UnvestedServiceBasedOptionAwards


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1100000.01400000.01600000.01300000.01300000.01700000.01400000.01600000.01300000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized50.058.366.733.350.070.863.6114.3100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value524000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LettersOfCreditOutstandingAmount


Letters
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value181717171616151515141414121212121011109.28.37.4
Percentage of LettersOfCreditOutstandingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:LossContingenciesByNatureOfContingency

us-gaap:InsuranceClaims


Letters
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1715141211109.28.37.4
Percentage of LettersOfCreditOutstandingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity


Line
Period End2021-06-302021-03-312020-12-312020-09-30
Value11131313
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0100.0

us-gaap:LongtermDebtWeightedAverageInterestRate us-gaap:DebtInstrument

us-gaap:LongtermDebtWeightedAverageInterestRate

mrtn:CreditFacility


Longterm
Period End2021-06-302021-03-312020-09-30
Value0.780.780.84
Percentage of LongtermDebtWeightedAverageInterestRate100.0100.0100.0

us-gaap:LongtermDebtWeightedAverageInterestRate us-gaap:LossContingenciesByNatureOfContingency

us-gaap:InsuranceClaims


Longterm
Period End2020-12-31
Value0.8
Percentage of LongtermDebtWeightedAverageInterestRate0.0

us-gaap:NontradeReceivablesCurrent

us-gaap:NontradeReceivablesCurrent


Nontrade
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4.9043.4894.2022.9081210113.6943.3545.2733.8086.9937.197.0376.1314.5415.6573.7144.4363.9393.0654.719104.0458.8143.475174.9056.4592.2124.1424.6782.8635.3887.1774.7385.3994.8763.434.8724.84212
Percentage of NontradeReceivablesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value2.10.0240.0250.02250.0210.021
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0100.0

us-gaap:PrepaidExpenseCurrent us-gaap:FairValueByAssetClass

us-gaap:PrepaidExpenseCurrent

mrtn:LicenseFeesMember


Prepaid
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value5529000.05321000.04760000.04858000.05042000.04921000.04397000.0
Percentage of PrepaidExpenseCurrent100.0100.0100.0100.0100.0100.0100.0

mrtn:PartsAndTiresInventory


Prepaid
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3372000.03394000.03528000.04322000.04350000.04011000.03754000.03133000.03067000.03340000.0
Percentage of PrepaidExpenseCurrent61.063.874.189.086.381.585.40.00.00.0

mrtn:TiresInService


Prepaid
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value4701000.04972000.05011000.04787000.05351000.05064000.04438000.03982000.04261000.03736000.0
Percentage of PrepaidExpenseCurrent85.093.4105.398.5106.1102.9100.90.00.00.0

us-gaap:PrepaidInsurance

us-gaap:PrepaidInsurance


Prepaid
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3653000.02356000.01831000.03057000.01658000.01730000.01537000.01384000.01316000.01334000.0
Percentage of PrepaidInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentSalvageValuePercentage us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentSalvageValuePercentage

mrtn:Tractor


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value25.00.250.250.250.250.25
Percentage of PropertyPlantAndEquipmentSalvageValuePercentage100.0100.0100.0100.0100.0100.0

mrtn:Trailer


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value35.00.350.350.350.350.35
Percentage of PropertyPlantAndEquipmentSalvageValuePercentage140.0140.0140.0140.0140.0140.0

us-gaap:PurchaseObligationDueInNextTwelveMonths us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PurchaseObligationDueInNextTwelveMonths

us-gaap:CapitalAdditions, mrtn:RevenueEquipment


Purchase
Period End2020-12-312020-09-30
Value10750
Percentage of PurchaseObligationDueInNextTwelveMonths100.0100.0

us-gaap:PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear

us-gaap:CapitalAdditions, mrtn:RevenueEquipment


Purchase
Period End2021-06-302021-03-312020-09-302017-12-312017-09-30
Value52893312111
Percentage of PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2020-12-31
Value3900000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2020-12-31
Value2500000.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0

us-gaap:StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased

us-gaap:StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased


Stock
Period End2020-08-312020-06-302020-03-312019-12-312019-09-302019-08-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-08-152015-11-302015-11-042007-12-31
Value2700000.01800000.01800000.01800000.01800000.01800000.0806000.0806000.0806000.01000000.01000000.01000000.03300000.02000000.02000000.01000000.0
Percentage of StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2020-12-31
Value4000000.0
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0

us-gaap:ValuationAllowancesAndReservesBalance us-gaap:ValuationAllowancesAndReservesType

us-gaap:ValuationAllowancesAndReservesBalance

mrtn:AllowanceForInsuranceAndClaimsAccruals


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value39312826191613
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForCreditLoss


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value0.3480.3820.3480.30.2750.305
Percentage of ValuationAllowancesAndReservesBalance0.91.21.21.11.41.9

Line plots across dimensions of each concept


Operating Margin
us-gaap:StatementBusinessSegments
(None,)
Operating  Marginus-gaap: Statement Business Segments
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:OperatingIncomeLoss
us-gaap:StatementBusinessSegments
(None,)
Operating Income Lossus-gaap: Statement Business Segments
us-gaap:Revenues
us-gaap:StatementBusinessSegments
(None,)
Revenuesus-gaap: Statement Business Segments
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:DepreciationDepletionAndAmortization
us-gaap:StatementBusinessSegments
(None,)
Depreciation Depletion And Amortizationus-gaap: Statement Business Segments
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Payments To Acquire Property Plant And Equipmentus-gaap: Property Plant And Equipment By Type