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Investments in Real Estate Entities (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Jun. 30, 2014
community
Dec. 31, 2014
community
Dec. 31, 2013
Dec. 31, 2012
Investment in Real Estate Entities        
Number of apartment communities sold 8avb_NumberofApartmentCommunitiesSold 4avb_NumberofApartmentCommunitiesSold    
Proceeds from sale of real estate   $ 281,125us-gaap_ProceedsFromSaleOfRealEstate $ 919,442us-gaap_ProceedsFromSaleOfRealEstate $ 274,018us-gaap_ProceedsFromSaleOfRealEstate
Gain on sale of communities   333,221us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal 96,152us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal 106,195us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Gain on sale of land   490us-gaap_GainLossOnSaleOfOtherAssets 240us-gaap_GainLossOnSaleOfOtherAssets 280us-gaap_GainLossOnSaleOfOtherAssets
Repayments of secured mortgages   16,341us-gaap_RepaymentsOfSecuredDebt 0us-gaap_RepaymentsOfSecuredDebt 0us-gaap_RepaymentsOfSecuredDebt
Loss on extinguishment of debt, net 412us-gaap_GainsLossesOnExtinguishmentOfDebt 412us-gaap_GainsLossesOnExtinguishmentOfDebt 14,921us-gaap_GainsLossesOnExtinguishmentOfDebt 1,179us-gaap_GainsLossesOnExtinguishmentOfDebt
Fund I        
Investment in Real Estate Entities        
Number of extension options   2avb_DebtInstrumentNumberOfExtensions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Period of extension (in years)   1 year    
Number of apartment communities sold   4avb_NumberofApartmentCommunitiesSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Number of Institutional Investors   9avb_NumberOfInstitutionalInvestors
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Combined general partner and limited partner equity interest (as a percent)   15.20%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Percentage of gain (loss) from sale of real estate recognized in income   100.00%avb_PercentageofGainLossfromSaleofRealEstateRecognized
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Repayments of secured mortgages   43,771us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Loss on extinguishment of debt, net   (328)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Fund I | Weymouth Place        
Investment in Real Estate Entities        
Proceeds from sale of real estate   25,750us-gaap_ProceedsFromSaleOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_WeymouthPlaceMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Fund I | South Hills        
Investment in Real Estate Entities        
Proceeds from sale of real estate   21,800us-gaap_ProceedsFromSaleOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_SouthHillsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Fund I | Avalon at Cedar Place        
Investment in Real Estate Entities        
Proceeds from sale of real estate   43,200us-gaap_ProceedsFromSaleOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_AvalonAtCedarPlaceMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Fund I | Avalon Sunset Towers        
Investment in Real Estate Entities        
Proceeds from sale of real estate   34,250us-gaap_ProceedsFromSaleOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_AvalonSunsetTowersMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Fund I | The Springs        
Investment in Real Estate Entities        
Gain on sale of land   16,656us-gaap_GainLossOnSaleOfOtherAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_TheSpringsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Joint Venture Partners | The Springs        
Investment in Real Estate Entities        
Gain on sale of communities   14,132us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_TheSpringsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_JointVenturePartnersMember
   
Noncontrolling interest, ownership percentage by noncontrolling owners   84.80%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_TheSpringsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_JointVenturePartnersMember
   
Fund II        
Investment in Real Estate Entities        
Number of apartment communities sold   2avb_NumberofApartmentCommunitiesSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Number of Institutional Investors   6avb_NumberOfInstitutionalInvestors
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Combined general partner and limited partner equity interest (as a percent)   31.30%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Repayments of secured mortgages   63,407us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Loss on extinguishment of debt, net   1,364us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Real Estate Investments, Joint Ventures   92,162us-gaap_RealEstateInvestmentsJointVentures
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Number of loans secured by individual assets   10us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Debt outstanding   358,811us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Maximum amount that will be paid for capital contributions made by partners (as a percent)   10.00%us-gaap_GuaranteeObligationsLiquidationProceedsPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Maximum amount that will be paid for capital contributions made by partners   8,910us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Fund II | Avalon Bellevue Park        
Investment in Real Estate Entities        
Proceeds from sale of real estate   58,750us-gaap_ProceedsFromSaleOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_AvalonBellevueParkMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Fund II | Avalon Fair Oaks        
Investment in Real Estate Entities        
Proceeds from sale of real estate   108,200us-gaap_ProceedsFromSaleOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_AvalonFairOaksMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
   
Fund II        
Investment in Real Estate Entities        
Gain on sale of communities   21,624us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= avb_AvalonBayValueAddedFundIILPMember
2,790us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= avb_AvalonBayValueAddedFundIILPMember
 
Eaves Plainsboro | Fund II        
Investment in Real Estate Entities        
Repayments of secured mortgages   42,023us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundIILPMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= avb_EavesPlainsboroMember
   
Secured notes        
Investment in Real Estate Entities        
Repayments of secured mortgages 5,914us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
     
Secured notes | Notes payable maturing in 2014 | Fund I | The Springs        
Investment in Real Estate Entities        
Repayments of secured mortgages   $ 21,748us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_DebtInstrumentAxis
= avb_NotesPayableMaturities2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_TheSpringsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember
   
Fixed rate (as a percent)   6.06%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= avb_NotesPayableMaturities2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= avb_TheSpringsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= avb_AvalonBayValueAddedFundLPMember