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Investments in Real Estate Entities (Details 2) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 home community | Mar. 31, 2014 | Dec. 31, 2014
Equity method investment |  |  |
Impairment of Real Estate | $ 5,788,000 us-gaap_ImpairmentOfRealEstate | $ 0 us-gaap_ImpairmentOfRealEstate |
Assets: |  |  |
Real estate, net | 1,524,554,000 avb_EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet |  | 1,617,627,000 avb_EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet
Other assets | 76,491,000 avb_EquityMethodInvestmentSummarizedFinancialInformationAssetsOtherAssets |  | 72,290,000 avb_EquityMethodInvestmentSummarizedFinancialInformationAssetsOtherAssets
Total assets | 1,601,045,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets |  | 1,689,917,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Liabilities and partners' capital: |  |  |
Mortgage notes payable and credit facility | 968,524,000 avb_EquityMethodInvestmentSummarizedFinancialInformationMortgageNotesPayableAndCreditFacility |  | 980,128,000 avb_EquityMethodInvestmentSummarizedFinancialInformationMortgageNotesPayableAndCreditFacility
Other liabilities | 25,510,000 avb_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesOtherLiabilities |  | 24,884,000 avb_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesOtherLiabilities
Partners' capital | 607,011,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital |  | 684,905,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
Total liabilities and partners' capital | 1,601,045,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity |  | 1,689,917,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity
Combined summary of the operating results of the accounted for using the equity method |  |  |
Rental and other income | 45,255,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue | 52,376,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue |
Operating and other expenses | (17,337,000)avb_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOtherExpenses | (21,208,000)avb_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOtherExpenses |
Gain on sale of communities | 32,490,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal | 0 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal |
Interest expense, net | (10,477,000)avb_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense | (13,890,000)avb_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense |
Depreciation expense | (11,902,000)avb_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization | (14,417,000)avb_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization |
Net income | 38,029,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss | 2,861,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss |
Impairment of investment in unconsolidated entities | 0 us-gaap_ImpairmentOfInvestments | 0 us-gaap_ImpairmentOfInvestments |
Expensed Acquisition, Development and Other Pursuit Costs and Impairment of Long-Lived Assets |  |  |
Expensed costs related to acquisition, development and other pursuit costs and impairment of long-lived assets | 1,187,000 avb_ExpensedCostsRelatedToAbandonedPursuits | 715,000 avb_ExpensedCostsRelatedToAbandonedPursuits |
Number of Real Estate Properties | 254 us-gaap_NumberOfRealEstateProperties |  |
Number of apartment homes included in operating apartment communities owned | 74,178 us-gaap_NumberOfUnitsInRealEstateProperty |  |
Fund I and II |  |  |
Combined summary of the operating results of the accounted for using the equity method |  |  |
Costs in excess of equity in underlying net assets of the respective investments | 3,347,000 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_AvalonBayValueAddedFundIAndIILPMember |  | 3,880,000 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_AvalonBayValueAddedFundIAndIILPMember
Fund II |  |  |
Combined summary of the operating results of the accounted for using the equity method |  |  |
Maximum amount that will be paid for capital contributions made by partners (as a percent) | 10.00%us-gaap_GuaranteeObligationsLiquidationProceedsPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_AvalonBayValueAddedFundIILPMember |  |
Maximum amount that will be paid for capital contributions made by partners | 8,910,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_AvalonBayValueAddedFundIILPMember |  |
Avalon Mills [Member] |  |  |
Equity method investment |  |  |
Impairment of Real Estate | 800,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonMillsMember |  |
Avalon at Edgewater [Member] |  |  |
Equity method investment |  |  |
Casualty Loss | 21,844,000 avb_CasualtyLoss / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Insurance Proceeds | 22,000,000 avb_InsuranceProceeds / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Impairment of Real Estate | 793,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Expensed Acquisition, Development and Other Pursuit Costs and Impairment of Long-Lived Assets |  |  |
Number of Real Estate Properties | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Number of apartment homes included in operating apartment communities owned | 168 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Loss Contingency, New Claims Filed, Number | 14 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Loss Contingency, Number of Plaintiffs | 100 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
New England [Member] |  |  |
Equity method investment |  |  |
Impairment of Real Estate | $ 4,195,000 us-gaap_ImpairmentOfRealEstate / us-gaap_StatementGeographicalAxis = avb_NewEnglandMember |  |

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