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v2.4.1.9

Discontinued Operations (Details) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 30, 2012 | Nov. 30, 2012 | Nov. 28, 2012 | Dec. 31, 2012
Description of Transaction |  |  |  |  |  |  |  |
Common Stock From Sale of Real Estate |  | $ 0 alx_CommonStockFromSaleOfRealEstate | $ 0 alx_CommonStockFromSaleOfRealEstate | $ 30,000,000 alx_CommonStockFromSaleOfRealEstate |  |  |  |
Acquisition of the noncontrolling interest |  | 0 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | 0 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | 7,800,000 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates |  |  |  |
Special long-term capital gain dividend |  |  |  | 623,178,000 alx_CommonStockDividendsDeclaredLongTermCapital |  |  |  |
Disposal Group Income And Expenses |  |  |  |  |  |  |  |
Interest and other income, net |  | 2,434,000 us-gaap_InterestAndOtherIncome | 1,527,000 us-gaap_InterestAndOtherIncome | 177,000 us-gaap_InterestAndOtherIncome |  |  |  |
Interest and debt expense |  | (32,068,000)us-gaap_InterestAndDebtExpense | (44,540,000)us-gaap_InterestAndDebtExpense | (45,652,000)us-gaap_InterestAndDebtExpense |  |  |  |
Net gain on sale of real estate | 599,628,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 599,628,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |
Income from discontinued operations |  | 529,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 2,252,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 624,952,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  |  |
Fees to Vornado |  | 4,516,000 us-gaap_CostsAndExpensesRelatedParty | 4,196,000 us-gaap_CostsAndExpensesRelatedParty | 4,318,000 us-gaap_CostsAndExpensesRelatedParty |  |  |  |
Kings Plaza Energy Joint Venture [Member] |  |  |  |  |  |  |  |
Description of Transaction |  |  |  |  |  |  |  |
Remaining Equity Interest Percentage Acquired |  |  |  |  | 75.00%alx_RemainingEquityInterestPercentageAcquired / us-gaap_BusinessAcquisitionAxis = alx_KingsPlazaEnergyJointVentureMember | 75.00%alx_RemainingEquityInterestPercentageAcquired / us-gaap_BusinessAcquisitionAxis = alx_KingsPlazaEnergyJointVentureMember |  |
Acquisition of the noncontrolling interest |  |  |  |  | 7,800,000 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / us-gaap_BusinessAcquisitionAxis = alx_KingsPlazaEnergyJointVentureMember |  |  |
Kings Plaza Regional Shopping Center [Member] |  |  |  |  |  |  |  |
Description of Transaction |  |  |  |  |  |  |  |
Financial Statement Gain |  |  |  |  |  |  | 601,976,000 alx_TotalGainOnSaleOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |
Disposal Group, Deferred Gain on Disposal |  |  |  |  |  |  | 2,348,000 us-gaap_DisposalGroupDeferredGainOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |
Special long-term capital gain dividend (in dollars per share) per share |  |  |  |  |  | $ 122.00 alx_CommonStockDividendsPerShareDeclaredLongTermCapital / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |
Special long-term capital gain dividend |  |  |  |  |  | 623,178,000 alx_CommonStockDividendsDeclaredLongTermCapital / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |
Disposal Group Income And Expenses |  |  |  |  |  |  |  |
Total revenues |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 61,836,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |  |  |
Total expenses |  | 0 alx_DisposalGroupIncludingDiscontinuedOperationTotalExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 0 alx_DisposalGroupIncludingDiscontinuedOperationTotalExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 31,214,000 alx_DisposalGroupIncludingDiscontinuedOperationTotalExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |  |  |
Operating income from discontinued operations |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 30,622,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |  |  |
Interest and other income, net |  | 529,000 us-gaap_InterestAndOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 2,252,000 us-gaap_InterestAndOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 45,000 us-gaap_InterestAndOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |  |  |
Interest and debt expense |  | 0 us-gaap_InterestAndDebtExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 0 us-gaap_InterestAndDebtExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | (5,343,000)us-gaap_InterestAndDebtExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |  |  |
Net gain on sale of real estate |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 599,628,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |  |  | 599,628,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember
Income from discontinued operations |  | 529,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 2,252,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember | 624,952,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |  |  |
Fees to Vornado |  |  |  | 1,368,000 us-gaap_CostsAndExpensesRelatedParty / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember |  |  |  |
Kings Plaza Regional Shopping Center [Member] | Macerich [Member] |  |  |  |  |  |  |  |
Description of Transaction |  |  |  |  |  |  |  |
Real Estate Property Sold Gross |  |  |  |  |  |  | 751,000,000 alx_RealEstatePropertySoldGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember / alx_PurchaserOfAssetsAxis = alx_MacerichMember |
Proceeds from sale of real estate |  |  |  |  |  |  | 479,000,000 alx_DisposalGroupProceedsFromSaleOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember / alx_PurchaserOfAssetsAxis = alx_MacerichMember |
Common Stock From Sale of Real Estate |  |  |  |  |  |  | $ 30,000,000 alx_CommonStockFromSaleOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = alx_KingsPlazaRegionalShoppingCenterMember / alx_PurchaserOfAssetsAxis = alx_MacerichMember |

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- Definition Special long term capital gain dividend per share to distribute the tax gain resulting from sale of property. + References No definition available. + Details
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- Definition This element represents the net proceeds from the sale of the property (including all forms of consideration received) after repaying the loan and closing costs. + References No definition available. + Details
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- Definition Gross sales price for the sale of real estate. + References No definition available. + Details
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- Definition The element represents the remaining equity interest percentage to be acquired. + References No definition available. + Details
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- Definition Gain on sale of real estate including portion recognized in income and portion deferred + References No definition available. + Details
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- Definition Costs of sales and operating expenses for the period incurred from transactions with related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The excess amount received or due over net assets in a transaction accounted for as a divestiture where a subsidiary, business or operating assets are "sold" by the entity to a newly formed, thinly capitalized, highly leveraged buyer. This gain is not yet recognized and is disclosed on the balance sheet as an offset against the carrying amount of the securities received. + References No definition available. + Details
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- Definition Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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