ALX


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

Table of contents


us-gaap:StatementEquityComponents
us-gaap:CommonStockSharesIssued

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:GeneralAndAdministrativeExpense

us-gaap:InterestAndDebtExpense

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:OperatingCostsAndExpenses

us-gaap:OperatingExpenses

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax
us-gaap:StatementEquityComponents

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService

us-gaap:Revenues
us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:Land

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssets

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

us-gaap:PaymentsOfDividendsCommonStock
alx:RealEstatePropertyOccupant, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty
alx:AnnualizedRevenue

alx:PaymentsForCapitalImprovementsAndConstructionInProcess

alx:PaymentsForCapitalImprovementsAndConstructionInProcessAndOther

alx:ProceedsFromSaleOfLandHeldForInvestmentExcludingDisposalCost
alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementScenario
alx:PurchaseOptionExercisedProceedsFromSaleOfLandHeldForUse
alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty
alx:PurchaseOptionNotExercisedAmountIncludedInTripleNetRentOverRemainderOfLease
alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementScenario
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:UnusualOrInfrequentItem
alx:RentCollectedDeferredPercent
us-gaap:UnusualOrInfrequentItem
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:UnusualOrInfrequentItem
alx:RentCollectedPercent
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:UnusualOrInfrequentItem
us-gaap:UnusualOrInfrequentItem
us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:PlanName
alx:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue
us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:PlanName
alx:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValuePerGrant
alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty
alx:TripleNetRentAnnualAmount

alx:WriteOffOfFullyAmortizedAndDepreciatedAssets
alx:RealEstatePropertyOccupant, us-gaap:UnusualOrInfrequentItem
alx:WriteoffofRentReceivable
us-gaap:UnusualOrInfrequentItem

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
us-gaap:StatementEquityComponents

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs
alx:RealEstatePropertyOccupant, us-gaap:UnusualOrInfrequentItem
us-gaap:UnusualOrInfrequentItem
us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1

us-gaap:CostsAndExpensesRelatedParty

us-gaap:DepreciationAndAmortization

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInDueToRelatedParties

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:InterestAndOtherIncome
alx:RealEstatePropertyOccupant, us-gaap:Range, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty
us-gaap:LossContingencyDamagesSoughtValue
alx:RealEstatePropertyOccupant, us-gaap:Range, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LossContingenciesByNatureOfContingency

us-gaap:MarketableSecuritiesUnrealizedGainLoss

us-gaap:OperatingLeaseLeaseIncome

us-gaap:OperatingLeaseLeaseIncomeLeasePayments

us-gaap:OperatingLeaseVariableLeaseIncome
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:PaymentsForCommissions

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments

us-gaap:ProceedsFromSaleOfLandHeldforinvestment
us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation
us-gaap:StatementEquityComponents

us-gaap:StraightLineRent

alx:CumulativeAmountOfTemporaryDifferenceBetweenBookValueAndTaxBasis
alx:ScheduleOfInsuranceTypeAndTierIdentifier
alx:FederalGovernmentResponsibility
alx:ScheduleOfInsuranceTypeAndTierIdentifier, dei:LegalEntity
alx:InsuranceDeductible

alx:NonCashAdditionsToRealEstate
us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:LongtermDebtType
alx:NotesPayableGross
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

alx:PledgedAssetsSeperatelyReportedRealEstatePledgedAsCollateralAtCarryingValue
alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementScenario
alx:PropertyPurchaseOptionExercisableByLessee

alx:RealEstateAndAccumulatedDepreciationCarryingAmountOfDevelopmentAndConstructionInProgress
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

alx:RealEstateBeforeRealEstateSoldAndWrittenOff
alx:ScheduleOfInsuranceTypeAndTierIdentifier, dei:LegalEntity
alx:SelfInsuredResponsibility
us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:PlanName
alx:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsMarketValue

alx:UnamortizedLeasingFeesToRelatedParty

srt:RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

us-gaap:AccountsReceivableNet
us-gaap:LongtermDebtType
us-gaap:AccumulatedAmortizationDeferredFinanceCosts
alx:RealEstatePropertyOccupant, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty
us-gaap:AreaOfLand
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:BuildingsAndImprovementsGross
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType

us-gaap:DeferredCostsLeasingNet
alx:RealEstatePropertyOccupant, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

us-gaap:DeferredFinanceCostsNet
us-gaap:LongtermDebtType

us-gaap:DeferredRentReceivablesNet

us-gaap:DevelopmentInProcess

us-gaap:DueToRelatedPartiesCurrentAndNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:InvestmentsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:MarketableSecurities
us-gaap:Ownership, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners
dei:LegalEntity, us-gaap:Ownership, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:MinorityInterestOwnershipPercentageByParent

us-gaap:NotesPayable
alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementScenario
us-gaap:LongtermDebtType
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:NotesPayableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OtherLiabilities
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
us-gaap:ParticipatingMortgageLoansParticipationLiabilitiesAmount
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:TypeOfArrangement

us-gaap:RealEstateAccumulatedDepreciation
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfLand

us-gaap:RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfLand

us-gaap:RealEstateGrossAtCarryingValue
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation

us-gaap:RealEstateInvestmentPropertyAtCost

us-gaap:RealEstateInvestmentPropertyNet
us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionDueFromToRelatedParty

us-gaap:RestrictedCashAndCashEquivalents

us-gaap:StockholdersEquityBeforeTreasuryStock

Plots across concepts


IncomeStatement
Comprehensive Income Net Of Tax
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Operating Lease Right Of Use Asset
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Operating Lease Right Of Use Asset
Liabilities
Operating Lease Liability
Stockholders Equity
Treasury Stock Value
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Share Outstanding Basic And Diluted
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Undiscounted Excess Amount

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
 us-gaap:CommonStockSharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄5.1735.1735.1735.1735.1735.1735.1735.1735.1735.1735.1735.1735.1735.1735.1735.1735.1735.173
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 5.123255NANANA5.120548NANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 5.123255NANANA5.120548NANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted NA5.122206NA5.1222065.1205485.118698NA5.1186985.118035.117347NA5.1173475.1166575.115982NA5.1159825.115325.114701
us-gaap:EarningsPerShareBasic 5.05NANANA2.41NA2.823.222.23.491.952.933.43-1.93.53.974.044.24
us-gaap:EarningsPerShareDiluted 5.05NANANA2.41NA2.823.222.23.491.952.933.43-1.93.53.974.044.24
us-gaap:EarningsPerShareBasicAndDiluted NA3.493.59999999999999961.292.410.892.82000000000000033.222.23.491.95000000000000022.933.43-1.93.53.974.044.24
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:ComprehensiveIncomeNetOfTax ██▇▄▅▄▆▆▅▇▅▆▆▁█▇▆▇25.14723.0817.7676.5912.3274.59714.45816.51511.30217.8789.97515.00217.518-9.65223.61218.63517.15418.276
us-gaap:GeneralAndAdministrativeExpense ▆▄▃▃█▃▂▂▆▂▂▁▅▂▁▂▅▁1.8231.5431.3591.3862.1111.4511.3011.3331.8931.2451.2641.1251.6891.2611.1721.2281.6961.156
us-gaap:InterestAndDebtExpense ▂▂▁▁▃▅▅▆▆▆█▇▇▆▅▅▃▂5.0865.144.9964.4636.1728.5738.8059.77210.16510.15912.41811.34110.9459.8299.1198.947.2556.16
us-gaap:InterestPaidNet ▁▁▁▁▂▅▅▆▆▆█▇▇▆4.8364.5654.5174.4495.7057.8057.7718.7919.1428.96510.5039.9469.4268.356NANANANA
us-gaap:NetIncomeLoss █▆▇▄▅▄▆▆▅▆▅▆▆▁▆▇▇▇25.89817.88218.4326.60412.3314.57214.43416.49311.28317.8659.97115.00317.57-9.717.88320.29920.6621.667
us-gaap:OperatingCostsAndExpenses ▅▅▆▄▁▃▄▅▃▃▅█▃▄▄▃▂▂23.42223.824.42422.44819.77821.75322.83323.38921.66721.84923.56826.41921.51122.27722.1921.27220.74420.921
us-gaap:OperatingExpenses ▅▆▇▃▁▃▄▄▃▃▅█▄▄▆▃▂▂33.37733.88535.01131.42129.52231.11331.95732.55331.42930.92232.71335.76931.931.82133.67430.9330.57830.122
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax ▁█▁▂▂▂▂▂▂▂▂▂▂▂-0.7515.198-0.665-0.014-0.0040.0250.0240.0220.0190.0130.004-0.001-0.0520.048NANANANA
 us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▁█▁▂▂▂▂▂▂▂▂▂▂▂-0.7515.198-0.665-0.014-0.0040.0250.0240.0220.0190.0130.004-0.001-0.0520.048NANANANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▅▇▇▁▂▆▇▇▇▇▇██▇██▇▇51.38856.15356.05543.49945.47854.1155.8857.7655.93256.77857.56759.12558.25357.8858.06158.09457.1957.229
us-gaap:Revenues ▅▇▇▁▂▆▇▇▇▇▇██▇██▇▇51.38856.15356.05543.49945.47854.1155.8857.7655.93256.77857.56759.12558.25357.8858.06158.09457.1957.229
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:Assets ▄▄▄▂▃▄▁▁▁▂▅▅▆████▄1429.0441411.2351404.1381327.9051384.1621403.4351265.5111283.3831276.4711295.7121481.2571500.8721524.2571617.2681632.3951622.0571630.2551443.932
us-gaap:Liabilities ▆▆▆▄▅▅▁▁▁▁▅▆▆██▇█▃1223.2391207.9771200.911119.3941159.1911168.3571011.9961021.2921007.8611015.771196.1651202.7271218.0861305.9871288.441279.9711285.061094.548
us-gaap:LiabilitiesAndStockholdersEquity ▄▄▄▂▃▄▁▁▁▂▅▅▆████▄1429.0441411.2351404.1381327.9051384.1621403.4351265.5111283.3831276.4711295.7121481.2571500.8721524.2571617.2681632.3951622.0571630.2551443.932
us-gaap:StockholdersEquity ▁▁▁▁▂▃▃▄▄▅▅▆▆▆████205.805203.258203.228208.511224.971235.078253.515262.091268.61279.942285.092298.145306.171311.281343.955342.086345.195349.384
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:CashAndCashEquivalentsAtCarryingValue ▇█▇▄▇▇▂▂▁▂▁▂▂▂▂▁█▂447.687459.384428.71355.712441.905438.342298.063304.229283.948302.944283.056303.71293.84319.026307.536280.01466.456306.53
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▆▆▅▃▅▅▂▂▁▂▁▂▁▄▄▃█▄469.056480.516449.877369.778453.265454.646313.977313.777289.322312.734289.495309.247300.083406.216393.279364.514551.023392.026
us-gaap:Land ▁█████████████████44.80444.97144.97144.97144.97144.97144.97144.97144.97144.97144.97144.97144.97144.97144.97144.97144.97144.971
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:OperatingLeaseRightOfUseAsset NANA3.974NANANA4.5294.6634.7964.928NANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA0.8NANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA0.8NANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA0.8NANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA0.8NANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA0.8NANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:StockholdersEquity ▁▁▁▁▂▃▃▄▄▅▅▆▆▆████205.805203.258203.228208.511224.971235.078253.515262.091268.61279.942285.092298.145306.171311.281343.955342.086345.195349.384
us-gaap:AdditionalPaidInCapital █▇▇▇▇▅▅▅▅▃▃▃▃▂▂▂▂▁33.41532.96532.96532.96532.96532.36532.36532.36532.36531.97131.97131.97131.97131.57731.57731.57731.57731.183
us-gaap:RetainedEarningsAccumulatedDeficit ▁▁▁▁▂▃▄▄▄▅▅▆▆▆████163.845160.997166.165170.783187.229197.932216.394224.994231.535243.28248.443261.5269.525274.977302.543306.403307.848308.925
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▆▇▁▂▂▂▂▂▂▂▂▂▂▂█▁▃▇3.744.491-0.707-0.042-0.028-0.024-0.049-0.073-0.095-0.114-0.127-0.131-0.13-0.0785.03-0.6990.9654.471
us-gaap:TreasuryStockValue ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄0.3680.3680.3680.3680.3680.3680.3680.3680.3680.3680.3680.3680.3680.3680.3680.3680.3680.368
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂█▄▁▄▄▄▇▁▇▂8.55353.96622.5452.76527.72125.03526.11749.1552.71548.0836.885NANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities █▆▂▁▃▃▅▆▅▆▆3.047-0.242-8.83-10.621-6.048-6.961-2.883-1.665-3.085-1.816-0.923NANANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▆▁▃█▃▃▃▃▃-23.06-23.08566.384-75.631-23.054122.595-23.034-23.035-23.042-23.028-25.714NANANANANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▃▅▆▁▄█▄▄▃▄-11.4630.63980.099-83.487-1.381140.6690.224.455-23.41223.239NANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:DepreciationDepletionAndAmortization ▂▃▄▁▂▄▃▃▄▃▄▄▅▄█▅▃▂8.5458.9589.5677.7628.599.2029.1149.1239.169.1189.1769.58310.1449.59611.6329.7158.7658.569
us-gaap:IncreaseDecreaseInAccountsReceivable ▄▁▄▆█▁▃▄▂▄▃▄▃▃▁▄▃▂0.732-1.2861.262.243.871-1.2250.4680.897-0.4711.1230.4440.6090.1150.214-1.311.2270.227-0.507
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂█▄▁▄▄▄▇▁▇▂8.55353.96622.5452.76527.72125.03526.11749.1552.71548.0836.885NANANANANANANA
us-gaap:NetIncomeLoss █▆▇▄▅▄▆▆▅▆▅▆▆▁▆▇▇▇25.89817.88218.4326.60412.3314.57214.43416.49311.28317.8659.97115.00317.57-9.717.88320.29920.6621.667
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities █▆▂▁▃▃▅▆▅▆▆3.047-0.242-8.83-10.621-6.048-6.961-2.883-1.665-3.085-1.816-0.923NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▆▁▃█▃▃▃▃▃-23.06-23.08566.384-75.631-23.054122.595-23.034-23.035-23.042-23.028-25.714NANANANANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt NANA94.00.00.0145.7080.00.00.00.00.00.0NANA0.00.0NANA
us-gaap:RepaymentsOfLongTermDebt NANA0.0NANANA0.00.00.00.00.6821.008157.4810.9710.9530.935300.9180.901
 us-gaap:RepaymentsOfLongTermDebt us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty,us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty srt:RetailSite,alx:LexingtonAvenuePropertyNANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividendsCommonStock ██████████████▁▁▁▁23.0523.0523.0523.0523.03423.03423.03423.03423.02823.02823.02823.02823.02223.02221.74321.74421.73721.737
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesIssued

us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value5173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173400.05173000.05173400.05173400.05173400.05173000.05173400.05173400.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.05173000.0
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302020-06-302012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value5123300.05120500.05108000.05107400.05107000.05107000.05106400.05105900.05105900.05105900.0
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302020-06-302012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value5123300.05120500.05108000.05107400.05107000.05107000.05106400.05105900.05105900.05105900.0
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted


Weighted
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value5122200.05122200.05120500.05118700.05118700.05118000.05117300.05117300.05116700.05116000.05116000.05115300.05114700.05114700.05113800.05113100.05113100.05112000.05111200.05111200.05110400.05109700.05109700.05108700.05108000.05108000.05107400.05107000.0
Percentage of WeightedAverageNumberOfShareOutstandingBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5.052.412.823.222.23.491.952.933.43-1.93.53.974.044.244.234.114.264.314.613.553.393.493.553.463.292.983.092.712.572.77120.823.693.73.814.044.03.953.573.53.53.052.96
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5.052.412.823.222.23.491.952.933.43-1.93.53.974.044.244.234.114.264.314.613.553.393.493.553.463.292.983.092.712.572.77120.823.693.73.814.044.03.953.573.53.53.052.96
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted


Earnings
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value3.493.61.292.410.892.823.222.23.491.952.933.43-1.93.53.974.044.244.234.114.264.314.613.553.393.493.553.463.292.983.092.712.572.77120.843.693.73.81
Percentage of EarningsPerShareBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2523176.59124.597141611179.9751517-9.6522318171816182521251912182816181717111117618181819
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.941.10.015.127.18.525.928.620.231.517.325.430.1-16.740.732.130.031.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1823000.01543000.01359000.01386000.02111000.01451000.01301000.01333000.01893000.01245000.01264000.01125000.01689000.01261000.01172000.01228000.01696000.01156000.01151000.01225000.01825000.01235000.01145000.01091000.01900000.01270000.01160000.01127000.01558000.01187000.01247000.01268000.01700000.01073000.01267000.01177000.01800000.01124000.01204000.01354000.0700000.01099000.01190000.04165000.01313000.0
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.52.70.03.24.62.72.32.33.42.22.21.92.92.22.02.13.02.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest And Debt Expense

us-gaap:InterestAndDebtExpense

us-gaap:InterestAndDebtExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5.0865.144.9964.4636.1728.5738.8059.77210101211109.8299.1198.947.2556.165.7655.6155.4555.4064.2766.0946.9246.9457.3487.4467.599.684111111111111121312101414151315
Percentage of InterestAndDebtExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.99.20.010.313.615.815.816.918.217.921.619.218.817.015.715.412.710.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.8364.5654.5174.4495.7057.8057.7718.7919.1428.965109.9469.4268.356
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.10.010.212.514.413.915.216.315.818.216.816.214.4

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2517186.604124.572141611179.9711517-9.717202021212121222318171718171615151313146171818192020201817171515
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.431.80.015.227.18.425.828.620.231.517.325.430.2-16.830.834.936.137.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2517186.604124.572141611179.9711517-9.71720202121212122231817171817161515131314
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.431.80.015.227.18.425.828.620.231.517.325.430.2-16.830.834.936.137.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Costs And Expenses

us-gaap:OperatingCostsAndExpenses

us-gaap:OperatingCostsAndExpenses


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
Value232324221921222321212326212222212020212119192019171918171716171614151616212121211921192018
Percentage of OperatingCostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax45.642.40.051.643.540.240.940.538.738.540.944.736.938.538.236.636.336.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating 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
Value333335312931313231303235313133303030303030292928262727252524262523232524313131312930293227
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 RevenueFromContractWithCustomerExcludingAssessedTax65.060.30.072.264.957.557.256.456.254.556.860.554.855.058.053.253.552.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-751000.05198000.0-665000.0-14000.0-4000.025000.024000.022000.019000.013000.04000.0-1000.0-52000.048000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.59.30.0-0.0-0.00.00.00.00.00.00.0-0.0-0.10.1

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-751000.05198000.0-665000.0-14000.0-4000.025000.024000.022000.019000.013000.04000.0-1000.0-52000.048000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.59.30.0-0.0-0.00.00.00.00.00.00.0-0.0-0.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value515656434554555755565759585758585757
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

alx:DirectServices


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.2720.9460.9570.9990.7430.820.841.1270.7370.7870.9790.880.9390.959
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.51.71.72.31.61.51.52.01.31.41.71.51.61.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.51.71.72.31.61.51.52.01.31.41.71.51.61.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax alx:DirectServices100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Parking


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.2120.7961.1611.1060.6361.3041.3861.3661.3611.4951.5591.4061.4081.307
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.41.42.12.51.42.42.52.42.42.62.72.42.42.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.41.42.12.51.42.42.52.42.42.62.72.42.42.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parking100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value515656434554555755565759585758585757
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

alx:Bloomberg, us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value28282827262727272627
Percentage of Revenues56.051.250.663.357.350.149.747.847.747.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax56.051.250.663.357.350.149.747.847.747.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax alx:Bloomberg us-gaap:SalesRevenueNet us-gaap:CustomerConcentrationRisk0.00.00.00.00.00.00.00.00.00.0

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
Value142914111404132713841403126512831276129514811500152416171632162216301443145114511445144814471456141714321423146514491452145714711469148514811765176117721771178417711679
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
Value122312071200111911591168101110211007101511961202121813051288127912851094109810941087109410941111107410841074112911121117112411401136114911491401139714091408142714211335
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 Assets85.685.685.584.383.783.280.079.679.078.480.880.179.980.878.978.978.875.875.775.475.275.675.676.375.875.775.577.076.877.077.177.577.377.477.679.479.379.579.580.080.279.5

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
Value142914111404132713841403126512831276129514811500152416171632162216301443145114511445144814471456141714321423146514491452145714711469148514811765176117721771178417711679
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value205203203208224235253262268279285298306311343342345349352356358353352345343348348336336334333330333335332358359359358353348340
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.414.414.515.716.316.820.020.421.021.619.219.920.119.221.121.121.224.224.324.624.824.424.423.724.224.324.523.023.223.022.922.522.722.622.420.320.420.320.319.819.720.3

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value3.744.491-0.707-0.042-0.028-0.024-0.049-0.073-0.095-0.114-0.127-0.131-0.13-0.0785.03-0.6990.9654.4717.86213151213109.73214143.9835.5763.4051.5220.212.6354.461.206
Percentage of StockholdersEquity1.82.2-0.3-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.01.5-0.20.31.32.23.74.33.53.73.22.84.34.11.21.71.00.50.10.81.30.4
Percentage of Assets0.30.3-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.3-0.00.10.30.50.91.10.80.90.70.71.01.00.30.40.20.10.00.20.30.1
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value3332323232323232323131313131313131313131313030303030303030292929292929
Percentage of StockholdersEquity16.216.216.215.814.713.812.812.312.011.411.210.710.410.19.29.29.18.98.88.78.78.78.78.98.98.68.79.08.98.98.99.08.98.78.8
Percentage of Assets2.32.32.32.52.42.32.62.52.52.52.22.12.12.01.91.91.92.22.12.12.22.12.12.12.22.12.12.12.12.02.02.02.02.02.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value163160166170187197216224231243248261269274302306307308308307307305304298298298299297296296297295296296296
Percentage of StockholdersEquity79.679.281.881.983.284.285.485.886.286.987.187.788.088.388.089.689.288.487.686.285.686.586.286.586.885.785.888.488.088.689.289.588.888.589.4
Percentage of Assets11.511.411.812.913.514.117.117.518.118.816.817.417.717.018.518.918.921.421.321.221.221.121.020.521.020.921.020.320.420.420.420.120.120.020.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.375-0.375
Percentage of StockholdersEquity-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash 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
Value447459428355441438298304283302283303293319307280466306288264235276259252211239227308307355347347331368353508488530506509490431397419443412515
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 Assets31.332.630.526.831.931.223.623.722.223.419.120.219.319.718.817.328.621.219.918.216.319.117.917.414.916.716.021.121.224.523.923.622.624.823.828.827.729.928.628.527.70.023.70.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value469480449369453454313313289312289309300406393364551392374349323344312
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets32.834.032.027.832.732.424.824.422.724.119.520.619.725.124.122.533.827.125.824.122.423.822.0

Land

us-gaap:Land

us-gaap:Land


Land
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value444444444444444444444444444444444444444444444444444444444444444444444444747474747474
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.13.23.23.43.23.23.63.53.53.53.03.03.02.82.82.82.83.13.13.13.13.13.13.13.23.13.23.13.13.13.13.13.13.03.02.54.34.24.24.24.24.5

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value3974000.04529000.04663000.04796000.04928000.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.40.40.4

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


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
Value542337404.966196.6912032182916361427415314274051122437471223334210202937102039481425354323
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.81.72.73.00.41.40.51.62.51.52.01.12.40.91.72.63.31.01.92.83.60.91.72.63.30.81.72.32.90.71.42.02.60.71.42.22.80.81.42.02.41.4

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value800000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value800000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value800000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value800000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value800000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.1

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value4236000.04845000.04993000.05139000.05284000.0
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.40.40.4

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value4800000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets0.3

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value564000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value205203203208224235253262268279285298306311343342345349352356358353352345343348348336336334333330333335332358359359358353348340
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.414.414.515.716.316.820.020.421.021.619.219.920.119.221.121.121.224.224.324.624.824.424.423.724.224.324.523.023.223.022.922.522.722.622.420.320.420.320.319.819.720.3

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value3.744.491-0.707-0.042-0.028-0.024-0.049-0.073-0.095-0.114-0.127-0.131-0.13-0.0785.03-0.6990.9654.4717.86213151213109.73214143.9835.5763.4051.5220.212.6354.461.206
Percentage of StockholdersEquity1.82.2-0.3-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.01.5-0.20.31.32.23.74.33.53.73.22.84.34.11.21.71.00.50.10.81.30.4
Percentage of Assets0.30.3-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.3-0.00.10.30.50.91.10.80.90.70.71.01.00.30.40.20.10.00.20.30.1
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value3332323232323232323131313131313131313131313030303030303030292929292929
Percentage of StockholdersEquity16.216.216.215.814.713.812.812.312.011.411.210.710.410.19.29.29.18.98.88.78.78.78.78.98.98.68.79.08.98.98.99.08.98.78.8
Percentage of Assets2.32.32.32.52.42.32.62.52.52.52.22.12.12.01.91.91.92.22.12.12.22.12.12.12.22.12.12.12.12.02.02.02.02.02.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value163160166170187197216224231243248261269274302306307308308307307305304298298298299297296296297295296296296
Percentage of StockholdersEquity79.679.281.881.983.284.285.485.886.286.987.187.788.088.388.089.689.288.487.686.285.686.586.286.586.885.785.888.488.088.689.289.588.888.589.4
Percentage of Assets11.511.411.812.913.514.117.117.518.118.816.817.417.717.018.518.918.921.421.321.221.221.121.020.521.020.921.020.320.420.420.420.120.120.020.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.368-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.374-0.375-0.375
Percentage of StockholdersEquity-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


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
Value333232323232323232313131313131313131313131303030303030303029292929292932323131313131
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.32.32.32.52.42.32.62.52.52.52.22.12.12.01.91.91.92.22.12.12.22.12.12.12.22.12.12.12.12.02.02.02.02.02.01.81.81.81.81.81.81.9

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
Value163160166170187197216224231243248261269274302306307308308307307305304298298298299297296296297295296296296321322322322316311304
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 Assets11.511.411.812.913.514.117.117.518.118.816.817.417.717.018.518.918.921.421.321.221.221.121.020.521.020.921.020.320.420.420.420.120.120.020.018.218.318.218.217.817.618.1

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value3.744.491-0.707-0.042-0.028-0.024-0.049-0.073-0.095-0.114-0.127-0.131-0.13-0.0785.03-0.6990.9654.4717.86213151213109.73214143.9835.5763.4051.5220.212.6354.461.2060.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.30.3-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.3-0.00.10.30.50.91.10.80.90.70.71.01.00.30.40.20.10.00.20.30.10.0

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0368000.0374000.0374000.0374000.0374000.0374000.0374000.0374000.0374000.0374000.0374000.0374000.0374000.0374000.0374000.0374000.0375000.0375000.0375000.0375000.0375000.0375000.0375000.0375000.0375000.0
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value8.55353222.765272526492.715486.8851937-17.22333743-14.372432443-16.43440332.207
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.696.140.26.461.046.346.785.14.984.712.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3.047-0.242-8.83-10.621-6.048-6.961-2.883-1.665-3.085-1.816-0.923-1.314-4.218-1.44-0.348711-0.935-4.2423.259-4.926-7.069-0.92513-18.193-23.235
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.9-0.4-15.8-24.4-13.3-12.9-5.2-2.9-5.5-3.2-1.60.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-23.06-23.08566-75.631-23.054122-23.034-23.035-23.042-23.028-25.714-18.141-18.033-17.975-18.092-903.993-22.911-22.859-23.244-22.636-18.10176-19.139-37.598-2.636
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-44.9-41.1118.4-173.9-50.7226.6-41.2-39.9-41.2-40.6-44.70.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-11.463080-83.487-1.3811400.224-23.41223
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-22.354.6142.9-191.9-3.0260.00.442.3-41.940.9

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value8.5458.9589.5677.7628.599.2029.1149.1239.169.1189.1769.583109.596119.7158.7658.5698.7088.685108.9748.9468.6648.0178.0448.0817.9627.9787.8987.867.8757.8397.8217.8759.5189.4659.5059.4729.369.3058.9499.1048.763
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


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
Value732000.0-1286000.01260000.02240000.03871000.0-1225000.0468000.0897000.0-471000.01123000.0444000.0609000.0115000.0214000.0-1310000.01227000.0227000.0-507000.0123000.0414000.0-790000.0-705000.01242000.0-438000.0-215000.01212000.0-174000.0104000.0-449000.0-193000.0624000.00-76000.0424000.0-1317000.01434000.0-1028000.0677000.0-179000.0-58000.0-1845000.0410000.0-6001000.08360000.0
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value8.55353222.765272526492.715486.8851937-17.22333743-14.372432443-16.43440332.207
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.696.140.26.461.046.346.785.14.984.712.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2517186.604124.572141611179.9711517-9.717202021212121222318171718171615151313146171818192020201817171515
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.431.832.915.227.18.425.828.620.231.517.325.430.2-16.830.834.936.137.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2517186.604124.572141611179.9711517-9.71720202121212122231817171817161515131314
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.431.832.915.227.18.425.828.620.231.517.325.430.2-16.830.834.936.137.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3.047-0.242-8.83-10.621-6.048-6.961-2.883-1.665-3.085-1.816-0.923-1.314-4.218-1.44-0.348711-0.935-4.2423.259-4.926-7.069-0.92513-18.193-23.235
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.9-0.4-15.8-24.4-13.3-12.9-5.2-2.9-5.5-3.2-1.60.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-23.06-23.08566-75.631-23.054122-23.034-23.035-23.042-23.028-25.714-18.141-18.033-17.975-18.092-903.993-22.911-22.859-23.244-22.636-18.10176-19.139-37.598-2.636
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-44.9-41.1118.4-173.9-50.7226.6-41.2-39.9-41.2-40.6-44.70.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312011-09-302010-12-312010-09-30
Value940.00.01450.00.00.00.00.00.00.00.00.00.00.03500.00.00.00.00.03000.00.00.00.00.00.03430.04.57414
Percentage of ProceedsFromIssuanceOfLongTermDebt100.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.00.0100.00.00.00.00.00.00.0100.00.0100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.00.00.00.00.00.6821.0081570.9710.9530.9353000.9010.8850.8680.8510.8360.8213200.7910.7760.7610.7480.7333144.0873.9823.9253.9632533.7563.7023.6983482.9471533.809293.921
Percentage of RepaymentsOfLongTermDebt0.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfLongTermDebt us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

srt:RetailSite, alx:LexingtonAvenueProperty


Repayments
Period End2020-09-14
Value50
Percentage of RepaymentsOfLongTermDebt0.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value23232323232323232323232323232121212120202020171717171616161614141414642191919151515151212
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alx:AnnualizedRevenue alx:RealEstatePropertyOccupant, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

alx:AnnualizedRevenue

alx:Century21, alx:RegoPark2Property


Annualized
Period End2020-12-31
Value0
Percentage of AnnualizedRevenue0.0

alx:PaymentsForCapitalImprovementsAndConstructionInProcess

alx:PaymentsForCapitalImprovementsAndConstructionInProcess


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value8.83106.0486.9612.8831.6653.0851.8161.4520.7251.1610.6280.2790.950.5771.6282.0652.2952.2938.8538.2021214142226111.4441.742.7121.9521.2670.8491.3742.4192.7094.1892.1871.8626.17721-3.107
Percentage of PaymentsForCapitalImprovementsAndConstructionInProcess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alx:PaymentsForCapitalImprovementsAndConstructionInProcessAndOther

alx:PaymentsForCapitalImprovementsAndConstructionInProcessAndOther


Payments
Period End2021-06-302021-03-312020-06-302020-03-31
Value6.2443.8426.0486.961
Percentage of PaymentsForCapitalImprovementsAndConstructionInProcessAndOther100.0100.0100.0100.0

alx:ProceedsFromSaleOfLandHeldForInvestmentExcludingDisposalCost

alx:ProceedsFromSaleOfLandHeldForInvestmentExcludingDisposalCost


Proceeds
Period End2021-06-04
Value10000000.0
Percentage of ProceedsFromSaleOfLandHeldForInvestmentExcludingDisposalCost100.0

alx:PurchaseOptionExercisedProceedsFromSaleOfLandHeldForUse alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementScenario

alx:PurchaseOptionExercisedProceedsFromSaleOfLandHeldForUse

alx:Ikea, alx:TenantOccupant, alx:ParamusProperty, srt:ScenarioForecast


Purchase
Period End2021-12-312021-10-31
Value4000000.07000000.0
Percentage of PurchaseOptionExercisedProceedsFromSaleOfLandHeldForUse100.0100.0

alx:PurchaseOptionNotExercisedAmountIncludedInTripleNetRentOverRemainderOfLease alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

alx:PurchaseOptionNotExercisedAmountIncludedInTripleNetRentOverRemainderOfLease

alx:Ikea, alx:TenantOccupant, alx:ParamusProperty


Purchase
Period End2021-03-31
Value68
Percentage of PurchaseOptionNotExercisedAmountIncludedInTripleNetRentOverRemainderOfLease100.0

alx:PurchaseOptionNotExercisedAmountIncludedInTripleNetRentOverRemainderOfLease alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementScenario

alx:Ikea, alx:TenantOccupant, alx:ParamusProperty, srt:ScenarioForecast


Purchase
Period End2021-10-31
Value68
Percentage of PurchaseOptionNotExercisedAmountIncludedInTripleNetRentOverRemainderOfLease0.0

alx:RentCollectedDeferredPercent us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:UnusualOrInfrequentItem

alx:RentCollectedDeferredPercent

srt:RetailSite, alx:COVID19


Rent
Period End2020-12-312020-09-302020-06-30
Value91.089.00.83
Percentage of RentCollectedDeferredPercent100.0100.0100.0

alx:RentCollectedDeferredPercent us-gaap:UnusualOrInfrequentItem

alx:COVID19


Rent
Period End2020-12-312020-09-302020-06-30
Value96.096.00.92
Percentage of RentCollectedDeferredPercent105.5107.9110.8

alx:RentCollectedPercent us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:UnusualOrInfrequentItem

alx:RentCollectedPercent

us-gaap:ResidentialRealEstate, alx:AlexanderApartmentTower, alx:COVID19


Rent
Period End2020-09-302020-06-30
Value97.00.96
Percentage of RentCollectedPercent100.0100.0

alx:RentCollectedPercent us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:UnusualOrInfrequentItem

srt:OfficeBuilding, alx:COVID19


Rent
Period End2021-06-302021-03-31
Value0100.0
Percentage of RentCollectedPercent0.00.0

srt:RetailSite, alx:COVID19


Rent
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value6.087.090.087.00.76
Percentage of RentCollectedPercent0.00.00.089.779.2

us-gaap:ResidentialRealEstate, alx:COVID19


Rent
Period End2021-06-302021-03-312020-12-31
Value-1.099.098.0
Percentage of RentCollectedPercent0.00.00.0

alx:RentCollectedPercent us-gaap:UnusualOrInfrequentItem

alx:COVID19


Rent
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value2.095.095.095.00.89
Percentage of RentCollectedPercent0.00.00.097.992.7

alx:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:PlanName

alx:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue

srt:Director, alx:DeferredStockUnits, alx:A2016OmnibusStockPlan


Share
Period End2021-05-31
Value450000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue100.0

alx:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValuePerGrant us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:PlanName

alx:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValuePerGrant

srt:Director, alx:DeferredStockUnits, alx:A2016OmnibusStockPlan


Share
Period End2021-05-31
Value56250.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValuePerGrant100.0

alx:TripleNetRentAnnualAmount alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

alx:TripleNetRentAnnualAmount

alx:Ikea, alx:TenantOccupant, alx:ParamusProperty


Triple
Period End2021-06-302021-03-312020-12-31
Value0700000.00
Percentage of TripleNetRentAnnualAmount0.0100.00.0

alx:WriteOffOfFullyAmortizedAndDepreciatedAssets

alx:WriteOffOfFullyAmortizedAndDepreciatedAssets


Write
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.05.6280.4190.090.00.3670.00.00.00.02.2990.0492.519110.00.04.2650.00.00.11.5790.012119.5170.00.0830.0570.00.0100.00.00.00.00.00.0240.00.6240.2890.05.0071.503-0.7790.105
Percentage of WriteOffOfFullyAmortizedAndDepreciatedAssets0.0100.0100.0100.00.0100.00.00.00.00.0100.0100.0100.0100.00.00.0100.00.00.0100.0100.0100.0100.0100.00.0100.0100.00.00.0100.00.00.00.00.00.0100.00.0100.0100.00.0100.0100.0100.0100.0

alx:WriteoffofRentReceivable alx:RealEstatePropertyOccupant, us-gaap:UnusualOrInfrequentItem

alx:WriteoffofRentReceivable

alx:Century21, alx:COVID19


Writeoffof
Period End2020-12-312020-09-30
Value0.05.919
Percentage of WriteoffofRentReceivable0.0100.0

alx:WriteoffofRentReceivable us-gaap:UnusualOrInfrequentItem

alx:COVID19


Writeoffof
Period End2020-12-312020-09-302020-06-30
Value0.06.594.247
Percentage of WriteoffofRentReceivable0.0111.30.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition


Adjustments
Period End2021-06-302020-06-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302012-12-312012-09-302011-12-312011-09-30
Value450000.0600000.00000000000000000
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302020-06-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302012-12-312012-09-302011-12-312011-09-30
Value450000.0600000.00000000000000000
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs


Allowance
Period End2020-12-312020-09-30
Value03100000.0
Percentage of AllowanceForDoubtfulAccountsReceivableWriteOffs0.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs alx:RealEstatePropertyOccupant, us-gaap:UnusualOrInfrequentItem

alx:Century21, alx:COVID19


Allowance
Period End2020-12-312020-09-30
Value02716000.0
Percentage of AllowanceForDoubtfulAccountsReceivableWriteOffs0.087.6

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs us-gaap:UnusualOrInfrequentItem

alx:COVID19


Allowance
Period End2020-12-312020-09-302020-06-30
Value03100000.01022000.0
Percentage of AllowanceForDoubtfulAccountsReceivableWriteOffs0.0100.00.0

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

us-gaap:ConcentrationRiskPercentage1

alx:Bloomberg, us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Concentration
Period End2021-03-312020-03-312019-03-31
Value51.00.50.48
Percentage of ConcentrationRiskPercentage1100.0100.0100.0

us-gaap:CostsAndExpensesRelatedParty

us-gaap:CostsAndExpensesRelatedParty


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1489000.01560000.01634000.01177000.01235000.01383000.01456000.01310000.01317000.01249000.01267000.01158000.01109000.01166000.01306000.01146000.01091000.01128000.01201000.01082000.01048000.01255000.01178000.01081000.01071000.01146000.01147000.01223000.01057000.01089000.01128000.01084000.01002000.0982000.01087000.01146000.01485000.01477000.02839000.0917000.01217000.01336000.0
Percentage of CostsAndExpensesRelatedParty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAndAmortization

us-gaap:DepreciationAndAmortization


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
Value8.1328.5429.2287.5877.6337.9097.8237.8317.8697.8287.8818.2258.78.283108.438.1388.0458.0628.0459.3678.3338.3038.0927.3417.357.3847.2717.287.2617.2577.2727.2357.2237.2387.2258.6678.6978.6598.5618.5778.2348.2267.8697.801
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value2323232323232323232323232323212121212020202017171717161616161414141464219191915151515
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value2323232323232323232323232323212121212020202017171717161616161414141464219191915151515
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


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
Value169.24-10.28512-9.92510-10.17511-10.9637.717-5.925-5.4534.648-5.035.782-5.4162.806-2.9614.7038.495-7.64810-8.70510-10.8639.861-9.05910-11.3368.888-11.55810-9.5874.488-8.1418.611-7.5867.009-10.95510-12.0298.328.12912
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDueToRelatedParties

us-gaap:IncreaseDecreaseInDueToRelatedParties


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
Value-706000.0430000.0295000.0-5000.0-95000.0-597000.0-3192000.01302000.01969000.0710000.0168000.0-11000.0-286000.0-1778000.01960000.0-15000.034000.0-353000.038000.0-344000.0711000.0-2318000.02330000.0-18000.0-55000.0-29000.0-43651000.01690000.0-3000.0-815000.0-725000.0-851000.0-740000.0-822000.0-859000.0-686000.0-205000.0-655000.0-1968000.0-8000.0-1041000.0572000.0-11481000.0-1447000.0
Percentage of IncreaseDecreaseInDueToRelatedParties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value31-14.278-5.35335-14.39412-13.596-10.01115-13.3412-20.40722-13.558-11.582-11.98239-13.131-13.194-11.02439-5.548-9.192-9.834-11.165-10.011-7.82431-9.547-9.564-7.73627-9.277-20.021-9.23235-10.481-9.741-7.41731-9.065-5.87718
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities


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
Value-0.165-0.163-0.163-0.16-0.159-0.156-0.155-0.152-0.151-0.151-0.006-10.10710-0.039-0.007-0.007-0.007-0.007-0.006-0.007-0.008-0.007-0.008-0.008-0.008-0.007-0.006-0.008-0.002-0.003-0.002-0.008-0.031-0.0010.107-0.007-0.008-0.007-0.008-0.008-0.008-0.007-0.008-0.122
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndOtherIncome

us-gaap:InterestAndOtherIncome


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.1510.1720.1940.220.711.5431.8162.0752.2232.133.9653.8131.733.0382.6112.0811.2970.7270.9170.5220.7751.0914.7120.4270.410.41.1990.4090.4250.4010.380.3740.3880.3850.0660.0410.0360.034
Percentage of InterestAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LossContingencyDamagesSoughtValue alx:RealEstatePropertyOccupant, us-gaap:Range, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

us-gaap:LossContingencyDamagesSoughtValue

alx:Sears, srt:Minimum, alx:RegoPark1Property


Loss
Period End2020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312014-06-30
Value0.00.00.04.00.00.04.00.04.0
Percentage of LossContingencyDamagesSoughtValue0.00.00.0100.00.00.0100.00.0100.0

us-gaap:LossContingencyDamagesSoughtValue alx:RealEstatePropertyOccupant, us-gaap:Range, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LossContingenciesByNatureOfContingency

alx:Sears, srt:Minimum, alx:RegoPark1Property, alx:EstimatedFutureDamages


Loss
Period End2020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312014-06-30
Value0.00.00.0250.00.0250.025
Percentage of LossContingencyDamagesSoughtValue0.00.00.0625.00.00.0625.00.0625.0

us-gaap:MarketableSecuritiesUnrealizedGainLoss

us-gaap:MarketableSecuritiesUnrealizedGainLoss


Marketable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3698000.0582000.02190000.0-1231000.01837000.0-11395000.0-2500000.0-1017000.0-5278000.038000.0-6429000.0-824000.0433000.0-5170000.00000
Percentage of MarketableSecuritiesUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:OperatingLeaseLeaseIncome

us-gaap:OperatingLeaseLeaseIncome


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4854534144515355535455565555
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLeaseIncomeLeasePayments

us-gaap:OperatingLeaseLeaseIncomeLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value32331933333435363535
Percentage of OperatingLeaseLeaseIncomeLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseVariableLeaseIncome

us-gaap:OperatingLeaseVariableLeaseIncome


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1620347.785101718191718
Percentage of OperatingLeaseVariableLeaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForCommissions us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:PaymentsForCommissions

srt:AffiliatedEntity


Payments
Period End2021-06-30
Value300000.0
Percentage of PaymentsForCommissions100.0

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsOfDebtIssuanceCosts


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
Value0.010.0354.5662.5810.020.0790.00.0010.0140.02.0040.0440.1410.00.2140.01110.0090.0140.00.00.0160.0044.0610.0010.0090.01-0.0180.044.2230.0020.00.0030.0820.00.00.0050.3951.873-0.1664.4230.0120.0570.0
Percentage of PaymentsOfDebtIssuanceCosts100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments


Proceeds
Period End2021-06-302021-03-31
Value03600000.0
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments0.0100.0

us-gaap:ProceedsFromSaleOfLandHeldforinvestment

us-gaap:ProceedsFromSaleOfLandHeldforinvestment


Proceeds
Period End2021-06-04
Value9291000.0
Percentage of ProceedsFromSaleOfLandHeldforinvestment100.0

us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty

alx:CommissionOnSaleOfRealEstate, srt:AffiliatedEntity


Related
Period End2021-06-30
Value0.3
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty100.0

alx:CompanyManagementFees, srt:AffiliatedEntity


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.70.70.70.70.70.70.70.70.70.6570.70.70.70.70.70.7
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty233.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

alx:DevelopmentFees, srt:AffiliatedEntity


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.0460.0330.0330.1880.1220.1460.00.00.0050.0240.0990.0170.0020.007-0.0030.0
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty15.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

alx:LeasingFees, srt:AffiliatedEntity


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.0280.4110.1040.1130.0090.050.6181.4222.0170.7370.00.0130.00.01.8110.003
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty9.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

alx:PropertyManagementFees, srt:AffiliatedEntity


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1.3791.4321.5321.0741.1391.3061.3321.2391.2971.1471.1241.0120.9391.0261.1671.006
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty459.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2.4532.5762.3692.0751.972.2022.653.3614.0192.5651.9231.7421.6411.7333.6751.709
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty817.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty

us-gaap:RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value595000.0595000.01785000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0595000.0540000.0540000.0540000.0
Percentage of RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation


Stock
Period End2020-09-302020-06-302019-09-302019-06-302018-09-302018-06-30
Value0600000.00394000.00394000.0
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation0.0100.00.0100.00.0100.0

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-09-302020-06-302019-09-302019-06-302018-09-302018-06-30
Value0600000.00394000.00394000.0
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation0.0100.00.0100.00.0100.0

us-gaap:StraightLineRent

us-gaap:StraightLineRent


Straight
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-2.382-2.637-2.796-9.486-6.885-1.935-0.463-0.637-0.668-0.645-0.335-3.551-0.593-1.445-1.074-1.074-1.079-1.07-0.753-0.684-0.9540.0440.1420.3330.3920.5510.6330.6230.6410.6410.6850.8121.2610.9490.6511.161.1951.469
Percentage of StraightLineRent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alx:CumulativeAmountOfTemporaryDifferenceBetweenBookValueAndTaxBasis

alx:CumulativeAmountOfTemporaryDifferenceBetweenBookValueAndTaxBasis


Cumulative
Period End2020-12-31
Value139
Percentage of CumulativeAmountOfTemporaryDifferenceBetweenBookValueAndTaxBasis100.0

alx:FederalGovernmentResponsibility alx:ScheduleOfInsuranceTypeAndTierIdentifier

alx:FederalGovernmentResponsibility

alx:Nbcr


Federal
Period End2021-06-302021-03-312020-12-312020-09-302015-12-312015-09-302015-06-302015-03-312014-12-31
Value80.080.080.080.00.850.850.850.850.85
Percentage of FederalGovernmentResponsibility100.0100.0100.0100.0100.0100.0100.0100.0100.0

alx:InsuranceDeductible alx:ScheduleOfInsuranceTypeAndTierIdentifier, dei:LegalEntity

alx:InsuranceDeductible

alx:Nbcr, alx:FiftyNinthStreetInsuranceCompanyLlc


Insurance
Period End2021-06-302021-03-312020-12-31
Value0275000.07000.0
Percentage of InsuranceDeductible0.0100.0100.0

alx:NonCashAdditionsToRealEstate

alx:NonCashAdditionsToRealEstate


Non
Period End2021-03-312020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-06-302011-03-312010-06-30
Value2.9133.2090.8291.0280.1921.931131.750.6031.8062.3913.5940.0
Percentage of NonCashAdditionsToRealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

alx:NonCashAdditionsToRealEstate us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty

alx:DevelopmentFees, srt:AffiliatedEntity


Non
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.0460.0330.1870.1230.146-0.0110.0050.024-0.0030.0020.027
Percentage of NonCashAdditionsToRealEstate0.01.10.00.04.50.00.02.90.00.02.6

alx:NotesPayableGross us-gaap:LongtermDebtType

alx:NotesPayableGross

us-gaap:Mortgages


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value1164116411641070112011209749749749749741171117212511252125312541056
Percentage of NotesPayableGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alx:NotesPayableGross us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType

srt:ApartmentBuilding, alx:TheAlexander, us-gaap:Mortgages


Notes
Period End2020-10-23
Value94
Percentage of NotesPayableGross0.0

srt:RetailSite, alx:AlexanderApartmentTower, us-gaap:Mortgages


Notes
Period End2020-12-31
Value94
Percentage of NotesPayableGross8.1

srt:RetailSite, alx:LexingtonAvenueProperty, us-gaap:Mortgages


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-09-142020-09-132020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value300300300300300350350350350350350350350350350
Percentage of NotesPayableGross25.825.825.828.00.00.031.231.235.935.935.935.935.929.927.9

srt:RetailSite, alx:RegoPark2Property, us-gaap:Mortgages


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2022022022022022025656565656253256
Percentage of NotesPayableGross17.417.417.418.918.118.15.85.85.85.85.821.620.5

alx:NotesPayableGross us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

srt:ApartmentBuilding, alx:TheAlexander, us-gaap:Mortgages, us-gaap:SubsequentEvent


Notes
Period End2020-10-23
Value94
Percentage of NotesPayableGross0.0

alx:PledgedAssetsSeperatelyReportedRealEstatePledgedAsCollateralAtCarryingValue

alx:PledgedAssetsSeperatelyReportedRealEstatePledgedAsCollateralAtCarryingValue


Pledged
Period End2020-12-31
Value657
Percentage of PledgedAssetsSeperatelyReportedRealEstatePledgedAsCollateralAtCarryingValue100.0

alx:PropertyPurchaseOptionExercisableByLessee alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementScenario

alx:PropertyPurchaseOptionExercisableByLessee

alx:Ikea, alx:TenantOccupant, alx:ParamusProperty, srt:ScenarioForecast


Property
Period End2021-10-31
Value75
Percentage of PropertyPurchaseOptionExercisableByLessee100.0

alx:RealEstateAndAccumulatedDepreciationCarryingAmountOfDevelopmentAndConstructionInProgress

alx:RealEstateAndAccumulatedDepreciationCarryingAmountOfDevelopmentAndConstructionInProgress


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value11124.2463.5512.789.486754.9242.2121.597
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfDevelopmentAndConstructionInProgress100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alx:RealEstateAndAccumulatedDepreciationCarryingAmountOfDevelopmentAndConstructionInProgress us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

srt:RetailSite, alx:RegoPark2Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-31
Value0.5030.0340.16
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfDevelopmentAndConstructionInProgress4.30.33.8

alx:RealEstateAndAccumulatedDepreciationCarryingAmountOfDevelopmentAndConstructionInProgress us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

alx:RegoPark1Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value6.4938.0610.5730.0750.0360.383
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfDevelopmentAndConstructionInProgress55.265.413.52.11.34.0

alx:RegoPark3Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-31
Value4.7653.7943.5133.237
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfDevelopmentAndConstructionInProgress40.530.882.791.2

alx:RealEstateBeforeRealEstateSoldAndWrittenOff

alx:RealEstateBeforeRealEstateSoldAndWrittenOff


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value350324311283254236210185160136
Percentage of RealEstateBeforeRealEstateSoldAndWrittenOff100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alx:SelfInsuredResponsibility alx:ScheduleOfInsuranceTypeAndTierIdentifier, dei:LegalEntity

alx:SelfInsuredResponsibility

alx:Nbcr, alx:FiftyNinthStreetInsuranceCompanyLlc


Self
Period End2021-06-302021-03-312020-12-312020-09-302017-12-31
Value20.020.020.020.00.17
Percentage of SelfInsuredResponsibility100.0100.0100.0100.0100.0

alx:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsMarketValue us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:PlanName

alx:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsMarketValue

srt:Director, alx:DeferredStockUnits, alx:A2016OmnibusStockPlan


Share
Period End2021-05-31
Value75000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsMarketValue100.0

alx:UnamortizedLeasingFeesToRelatedParty

alx:UnamortizedLeasingFeesToRelatedParty


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value252727303031323232303131333435343536363738383331323333343535363738393940474848485048
Percentage of UnamortizedLeasingFeesToRelatedParty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:RealEstateAndAccumulatedDepreciationAmountOfEncumbrances

srt:RealEstateAndAccumulatedDepreciationAmountOfEncumbrances


Real
Period End2020-12-312019-12-312018-12-31
Value11649741170
Percentage of RealEstateAndAccumulatedDepreciationAmountOfEncumbrances100.0100.0100.0

srt:RealEstateAndAccumulatedDepreciationAmountOfEncumbrances us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

srt:RetailSite, alx:RegoPark2Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-31
Value20256252
Percentage of RealEstateAndAccumulatedDepreciationAmountOfEncumbrances17.45.821.6

srt:RealEstateAndAccumulatedDepreciationAmountOfEncumbrances us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

alx:AlexanderApartmentTower, stpr:NY


Real
Period End2020-12-312019-12-312018-12-31
Value940.00.0
Percentage of RealEstateAndAccumulatedDepreciationAmountOfEncumbrances8.10.00.0

alx:LexingtonAvenueProperty, stpr:NY


Real
Period End2020-12-312019-12-312018-12-31
Value800850850
Percentage of RealEstateAndAccumulatedDepreciationAmountOfEncumbrances68.787.272.6

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent


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
Value584235443141313827383036413842364139423830383042344435483237273929383340324034463441
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableNet

us-gaap:AccountsReceivableNet


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
Value7562000.06830000.08116000.06856000.07716000.04867000.06092000.05624000.04727000.05198000.04075000.03631000.03022000.02907000.02693000.04003000.02776000.02549000.03056000.02933000.02519000.03309000.04014000.02772000.03210000.03425000.02213000.02387000.02283000.02732000.02925000.02301000.02301000.02377000.01953000.03270000.01836000.02864000.02552000.02731000.02789000.04224000.0
Percentage of AccountsReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedAmortizationDeferredFinanceCosts us-gaap:LongtermDebtType

us-gaap:AccumulatedAmortizationDeferredFinanceCosts

us-gaap:Mortgages


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value131313121615141311109.212108.9157.6286.3154.9953.716.824
Percentage of AccumulatedAmortizationDeferredFinanceCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AreaOfLand alx:RealEstatePropertyOccupant, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

us-gaap:AreaOfLand

alx:Sears, alx:RegoPark1Property


Area
Period End2020-12-31
Value195000.0
Percentage of AreaOfLand100.0

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

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-31
Value106.606
Percentage of AssetsFairValueDisclosure100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-31
Value3.7954.516
Percentage of AssetsFairValueDisclosure36.868.4

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

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:SecuritiesAssets


Assets
Period End2021-06-302021-03-312020-12-312019-12-31
Value106.6066.02414
Percentage of AssetsFairValueDisclosure100.0100.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:InterestRateSwap


Assets
Period End2021-06-302021-03-31
Value3.7954.516
Percentage of AssetsFairValueDisclosure36.868.4

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-31
Value1411
Percentage of AssetsFairValueDisclosure136.8168.4

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:InterestRateSwap


Assets
Period End2021-06-302021-03-31
Value3.7954.516
Percentage of AssetsFairValueDisclosure36.868.4

us-gaap:FairValueMeasurementsRecurring, us-gaap:SecuritiesAssets


Assets
Period End2021-06-302021-03-312020-12-312019-12-31
Value106.6066.02414
Percentage of AssetsFairValueDisclosure100.0100.00.00.0

us-gaap:BuildingsAndImprovementsGross

us-gaap:BuildingsAndImprovementsGross


Buildings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value101110091014986986985984981980980978976976978988988987987985983982981975950874874873871870870869869867866864864988986985982978934
Percentage of BuildingsAndImprovementsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value383423393318406403263270248267173268259259273246431273256224204222226
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value383423393318406403263270248267173268259259273246431273256224204222226221185224111300303341184
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.0

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateEffectivePercentage

srt:ApartmentBuilding, alx:TheAlexander, us-gaap:Mortgages


Debt
Period End2020-10-23
Value2.63
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0

srt:OfficeBuilding, alx:LexingtonAvenueProperty, us-gaap:Mortgages


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value0.971.011.061.050.01090.01610.02640.02930.03290.03380.0306
Percentage of DebtInstrumentInterestRateEffectivePercentage0.00.00.00.00.00.00.00.00.00.00.0

srt:RetailSite, alx:AlexanderApartmentTower, us-gaap:Mortgages


Debt
Period End2020-12-31
Value2.63
Percentage of DebtInstrumentInterestRateEffectivePercentage0.0

srt:RetailSite, alx:LexingtonAvenueProperty, us-gaap:Mortgages


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value1.481.51.551.560.01570.02780.0310.03470.03830.03880.0351
Percentage of DebtInstrumentInterestRateEffectivePercentage0.00.00.00.00.00.00.00.00.00.00.0

srt:RetailSite, alx:RegoPark2Property, us-gaap:Mortgages


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.451.461.51.50.01530.02290.03150.03390.03750.03850.03870.0411
Percentage of DebtInstrumentInterestRateEffectivePercentage0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

srt:ApartmentBuilding, alx:TheAlexander, us-gaap:Mortgages, us-gaap:SubsequentEvent


Debt
Period End2020-10-23
Value2.63
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType

alx:ParamusProperty, us-gaap:Mortgages


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value4.724.724.724.720.04720.04720.04720.04720.04720.04720.029
Percentage of DebtInstrumentInterestRateEffectivePercentage0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DeferredCostsLeasingNet

us-gaap:DeferredCostsLeasingNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value333536383940414141404041434445444647484950514543444546474849505152535455646566676868
Percentage of DeferredCostsLeasingNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCostsLeasingNet alx:RealEstatePropertyOccupant, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

alx:Century21, alx:RegoPark2Property


Deferred
Period End2020-09-30
Value1.619
Percentage of DeferredCostsLeasingNet4.2

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredFinanceCostsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8.3743.8759.01123.7886.3256.9643.4754.154.8245.4996.1976.8443.2463.8374.4295.0185.5226.10710101110118.167
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:LongtermDebtType

us-gaap:Mortgages


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value7.6588.0278.3744.1411.7312.6653.8755.1636.457.7249.018.2989.602101213143.788
Percentage of DeferredFinanceCostsNet0.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.0100.0

us-gaap:DeferredRentReceivablesNet

us-gaap:DeferredRentReceivablesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value140142145148157164166166167168168169172173174175176177179179180181181181180180179179178178177176175174173173190189188185182175
Percentage of DeferredRentReceivablesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DevelopmentInProcess

us-gaap:DevelopmentInProcess


Development
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value161211332217129.4148.5566.2924.2464.2393.6953.533.5513.2763.0712.9132.783.6313.1693.5979.48640105897556256.0854.9244.0353.412.4322.2121.932.0662.231.5971.4441.36740
Percentage of DevelopmentInProcess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DueToRelatedPartiesCurrentAndNoncurrent

us-gaap:DueToRelatedPartiesCurrentAndNoncurrent


Due
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value0.7551.4121.5161.1780.9960.971.4264.6383.4161.4420.7080.4410.4340.7182.490.5330.5510.5420.8970.8971.2230.4748.5515.9665.4864.6583.922444242434444454639404041434343
Percentage of DueToRelatedPartiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialLiabilitiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FinancialLiabilitiesFairValueDisclosure

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:InterestRateSwap


Financial
Period End2020-12-31
Value667000.0
Percentage of FinancialLiabilitiesFairValueDisclosure100.0

us-gaap:FinancialLiabilitiesFairValueDisclosure us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:InterestRateSwap


Financial
Period End2020-12-31
Value667000.0
Percentage of FinancialLiabilitiesFairValueDisclosure100.0

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

us-gaap:InvestmentsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, alx:MarketableSecurities


Investments
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3.8345.0653.014141617232329302935
Percentage of InvestmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:FairValueMeasurementsRecurring, alx:MarketableSecurities


Investments
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3.8345.0653.014141617232329302935
Percentage of InvestmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value800000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears


Lessor
Period End2020-12-31
Value124
Percentage of LessorOperatingLeasePaymentsToBeReceivedFiveYears100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears


Lessor
Period End2020-12-31
Value135
Percentage of LessorOperatingLeasePaymentsToBeReceivedFourYears100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths


Lessor
Period End2020-12-31
Value132
Percentage of LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter


Lessor
Period End2020-12-31
Value475
Percentage of LessorOperatingLeasePaymentsToBeReceivedThereafter100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears


Lessor
Period End2020-12-31
Value127
Percentage of LessorOperatingLeasePaymentsToBeReceivedThreeYears100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears


Lessor
Period End2020-12-31
Value126
Percentage of LessorOperatingLeasePaymentsToBeReceivedTwoYears100.0

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LettersOfCreditOutstandingAmount


Letters
Period End2021-06-302021-03-312020-12-312020-09-30
Value960000.0960000.0960000.01030000.0
Percentage of LettersOfCreditOutstandingAmount100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive


Long
Period End2020-12-31
Value94
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-31
Value68
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2020-12-31
Value502
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-31
Value500
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:MarketableSecurities

us-gaap:MarketableSecurities


Marketable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value106.6066.0243.8345.0653.01414161723232930293529313437434542434139454434353331303234310.0
Percentage of MarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners us-gaap:Ownership, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners

alx:MrRothInterstateDavidMandelbaumAndRussellBWightJr, alx:ManagementAndPartners


Minority
Period End2020-12-31
Value26.1
Percentage of MinorityInterestOwnershipPercentageByNoncontrollingOwners100.0

us-gaap:MinorityInterestOwnershipPercentageByParent dei:LegalEntity, us-gaap:Ownership, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:MinorityInterestOwnershipPercentageByParent

alx:Vornado, alx:AlexandersInc., alx:ManagementAndPartnersThroughRelatedParty


Minority
Period End2020-12-312019-12-31
Value2.30.023
Percentage of MinorityInterestOwnershipPercentageByParent100.0100.0

alx:Vornado, alx:AlexandersInc., srt:AffiliatedEntity


Minority
Period End2020-12-312019-12-31
Value32.40.324
Percentage of MinorityInterestOwnershipPercentageByParent1408.71408.7

us-gaap:NotesPayable

us-gaap:NotesPayable


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value11561156115610661118111797096996896711611162116212401240124012391051105210521052105310531060103110321032103310341035104910541058106110651080
Percentage of NotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesPayable alx:RealEstatePropertyOccupant, us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementScenario

alx:Ikea, alx:TenantOccupant, alx:ParamusProperty, srt:ScenarioForecast


Notes
Period End2021-10-31
Value68
Percentage of NotesPayable0.0

us-gaap:NotesPayable us-gaap:LongtermDebtType

us-gaap:Mortgages


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value1156115611561066111811179709699689679651162116212401240124012391052
Percentage of NotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.083.2100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesPayable us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

srt:RetailSite, alx:RegoPark2Property, us-gaap:Mortgages, us-gaap:SubsequentEvent, alx:ParticipationAgreement


Notes
Period End2021-04-07
Value202
Percentage of NotesPayable0.0

us-gaap:NotesPayable us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement

srt:RetailSite, alx:RegoPark2Property, us-gaap:Mortgages, alx:ParticipationAgreement


Notes
Period End2021-04-072021-03-312020-12-31
Value202252252
Percentage of NotesPayable0.021.821.8

us-gaap:NotesPayableFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:NotesPayableFairValueDisclosure

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value112411291130103210981107974973972970969116311621241123912411245104210451045104610441054
Percentage of NotesPayableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesPayableFairValueDisclosure us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value116411641164107011201120974974974974117011711172125112521253125410551056105710571058105910601031103210321033103410351049
Percentage of NotesPayableFairValueDisclosure103.6103.1103.1103.7102.1101.2100.1100.2100.3100.5120.8100.7100.9100.8101.1101.0100.7101.3101.1101.2101.1101.4100.50.00.00.00.00.00.00.00.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-31
Value4.53
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0

us-gaap:OtherLiabilities

us-gaap:OtherLiabilities


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value6.8877.0527.8827.3787.5387.6977.8538.0088.168.3113.0343.04132.8622.9012.9082.9152.9222.9292.9352.9422.952.9572.9652.9732.9812.9882.9943.4223.4243.4273.4293.6433.6743.6751.2131.2121.2131.2133.718
Percentage of OtherLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ParticipatingMortgageLoansParticipationLiabilitiesAmount us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement

us-gaap:ParticipatingMortgageLoansParticipationLiabilitiesAmount

srt:RetailSite, alx:RegoPark2Property, us-gaap:Mortgages, alx:ParticipationAgreement


Participating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value505050505050195
Percentage of ParticipatingMortgageLoansParticipationLiabilitiesAmount100.0100.0100.0100.0100.0100.0100.0

us-gaap:ParticipatingMortgageLoansParticipationLiabilitiesAmount us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:TypeOfArrangement

alx:RegoPark2Property, alx:ParticipationAgreement


Participating
Period End2020-12-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value50195195195195198
Percentage of ParticipatingMortgageLoansParticipationLiabilitiesAmount100.0100.00.00.00.00.0

us-gaap:RealEstateAccumulatedDepreciation

us-gaap:RealEstateAccumulatedDepreciation


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value350324297283252225210185160184157132114
Percentage of RealEstateAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateAccumulatedDepreciation us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

srt:RetailSite, alx:RegoPark2Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-31
Value11310393
Percentage of RealEstateAccumulatedDepreciation32.432.031.3

us-gaap:RealEstateAccumulatedDepreciation us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

alx:AlexanderApartmentTower, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-31
Value2117139.856
Percentage of RealEstateAccumulatedDepreciation6.05.44.63.5

alx:FlushingProperty, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1.1461.0871.0280.9680.9090.85
Percentage of RealEstateAccumulatedDepreciation0.30.30.30.30.40.4

alx:LexingtonAvenueProperty, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value175165154154141129
Percentage of RealEstateAccumulatedDepreciation50.250.951.954.755.857.6

alx:RegoPark1Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value383634333129
Percentage of RealEstateAccumulatedDepreciation11.011.311.811.712.313.0

alx:RegoPark3Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.3250.290.2590.228
Percentage of RealEstateAccumulatedDepreciation0.10.10.10.1

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1014984978988985975873869864985
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

srt:RetailSite, alx:RegoPark2Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-31
Value390389389
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements38.539.639.8

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

alx:LexingtonAvenueProperty, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value416410405415415414
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements41.041.741.442.042.142.5

alx:RegoPark1Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value866262626160
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements8.56.46.46.36.26.2

alx:RegoPark3Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.5270.5030.5030.503
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements0.10.10.10.1

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfLand

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfLand


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value44444444444444444474
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfLand100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements

us-gaap:RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value10239939799899859819468718631004
Percentage of RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

srt:RetailSite, alx:RegoPark2Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-31
Value389388387
Percentage of RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements38.039.139.6

us-gaap:RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

alx:LexingtonAvenueProperty, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value416411405416416415
Percentage of RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements40.841.441.442.042.242.3

alx:RegoPark1Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value846154535251
Percentage of RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements8.26.25.65.45.35.3

alx:RegoPark3Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.2924.2974.0163.74
Percentage of RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements0.50.40.40.4

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value26262626262626262635
Percentage of RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfLand

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfLand


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value21212121212121212122
Percentage of RealEstateAndAccumulatedDepreciationInitialCostOfLand100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateGrossAtCarryingValue

us-gaap:RealEstateGrossAtCarryingValue


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value107110411027103710331029993919911106210501025967
Percentage of RealEstateGrossAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateGrossAtCarryingValue us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

srt:RetailSite, alx:RegoPark2Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-31
Value393392392
Percentage of RealEstateGrossAtCarryingValue36.837.738.2

us-gaap:RealEstateGrossAtCarryingValue us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical

alx:LexingtonAvenueProperty, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value443438432442442442
Percentage of RealEstateGrossAtCarryingValue41.442.142.142.742.843.0

alx:RegoPark1Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value947265636262
Percentage of RealEstateGrossAtCarryingValue8.97.06.36.26.16.1

alx:RegoPark3Property, stpr:NY


Real
Period End2020-12-312019-12-312018-12-312017-12-31
Value6.0715.0764.7954.519
Percentage of RealEstateGrossAtCarryingValue0.60.50.50.4

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation


Real
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value358351350343337330324317311304297290283278283273266259252245239232225229222216210203197191185179173166160154198191184177170157
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateInvestmentPropertyAtCost

us-gaap:RealEstateInvestmentPropertyAtCost


Real
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value10721067107110641054104710411035103410311027102510251027103710361035103510331032103010301029103510251009993972940921919918916913911911106510631062105810551050
Percentage of RealEstateInvestmentPropertyAtCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateInvestmentPropertyNet

us-gaap:RealEstateInvestmentPropertyNet


Real
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value714715720721716717716717723727730734741748754762768775780786791797803806802792783768743730734738743746750756866872877880884893
Percentage of RealEstateInvestmentPropertyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RelatedPartyTransactionDueFromToRelatedParty us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RelatedPartyTransactionDueFromToRelatedParty

alx:DevelopmentFees, srt:AffiliatedEntity


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-0.079-0.033-0.557-0.524-0.337-0.215-0.068-0.068-0.175-0.17-0.1460.0470.021
Percentage of RelatedPartyTransactionDueFromToRelatedParty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alx:LeasingFees, srt:AffiliatedEntity


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-0.028-0.428-0.114-0.01-0.05-0.563-3.871-2.448-0.729-0.0130.0131.811
Percentage of RelatedPartyTransactionDueFromToRelatedParty35.41297.020.51.923.3827.95692.61398.9428.88.927.78623.8

alx:ManagementPropertyManagementCleaningEngineeringAndSecurityFees, srt:AffiliatedEntity


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-0.648-0.951-0.845-0.644-0.659-0.705-0.795-0.699-0.793-0.543-0.5490.3810.658
Percentage of RelatedPartyTransactionDueFromToRelatedParty820.32881.8151.7122.9195.5327.91169.11027.9453.1319.4376.0810.63133.3

us-gaap:RestrictedCashAndCashEquivalents

us-gaap:RestrictedCashAndCashEquivalents


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value212121141116159.5485.3749.796.4395.5376.2438785848485858587838584848484848585909088899089898788888885
Percentage of RestrictedCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockholdersEquityBeforeTreasuryStock

us-gaap:StockholdersEquityBeforeTreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value206203203208225235253262268280285298306311344342345349353357359354353345344349348336337334333330333335332359359359359353348340
Percentage of StockholdersEquityBeforeTreasuryStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components