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v2.4.1.9

Subsequent Events (Details) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 home community | Dec. 31, 2013 home | Dec. 31, 2012 home | Jan. 31, 2015
Subsequent events |  |  |  |
Number of apartment homes sold | 1,337 avb_NumberOfApartmentHomesSold | 3,299 avb_NumberOfApartmentHomesSold | 1,578 avb_NumberOfApartmentHomesSold |
Proceeds from sale of real estate | $ 281,125,000 us-gaap_ProceedsFromSaleOfRealEstate | $ 919,442,000 us-gaap_ProceedsFromSaleOfRealEstate | $ 274,018,000 us-gaap_ProceedsFromSaleOfRealEstate |
Estimated number of apartment homes in communities to be developed | 10,384 avb_EstimatedNumberOfApartmentHomesInCommunitiesExpectedToBeDeveloped |  |  |
Number of residential buildings | 251 us-gaap_NumberOfRealEstateProperties |  |  |
Number of apartment homes included in operating apartment communities owned | 73,963 us-gaap_NumberOfUnitsInRealEstateProperty |  |  |
MVPI LLC |  |  |  |
Subsequent events |  |  |  |
Combined general partner and limited partner equity interest (as a percent) | 25.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_MVPILLCMember |  |  |
Subsequent event | MVPI LLC |  |  |  |
Subsequent events |  |  |  |
Receipts from a joint venture partner for modification of agreement |  |  |  | 20,700,000 us-gaap_PaymentsForProceedsFromOtherRealEstatePartnerships / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_MVPILLCMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent event | Avalon on Stamford Harbor |  |  |  |
Subsequent events |  |  |  |
Number of apartment homes sold |  |  |  | 323 avb_NumberOfApartmentHomesSold / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonOnStamfordHarborMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of boat slips |  |  |  | 74 avb_NumberOfBoatSlipsInMarinaCommunities / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonOnStamfordHarborMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Proceeds from sale of real estate |  |  |  | 115,500,000 us-gaap_ProceedsFromSaleOfRealEstate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonOnStamfordHarborMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent event | Development Rights In New York, NY And Bellevue, WA |  |  |  |
Subsequent events |  |  |  |
Payments to acquire land |  |  |  | 325,000,000 us-gaap_PaymentsToAcquireLand / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_DevelopmentRightsInNewYorkNYAndBellevueWAMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of Development Rights |  |  |  | 3 avb_NumberOfDevelopmentRights / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_DevelopmentRightsInNewYorkNYAndBellevueWAMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Estimated number of apartment homes in communities to be developed |  |  |  | 910 avb_EstimatedNumberOfApartmentHomesInCommunitiesExpectedToBeDeveloped / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_DevelopmentRightsInNewYorkNYAndBellevueWAMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Projected capital cost to develop apartment homes |  |  |  | 509,717,000 avb_RealEstateInvestmentPropertyProjectedCapitalCostToDevelopRealEstate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_DevelopmentRightsInNewYorkNYAndBellevueWAMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent event | Avalon at Edgewater |  |  |  |
Subsequent events |  |  |  |
Number of residential buildings |  |  |  | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of uninhabitable residential buildings due to fire damage |  |  |  | 1 avb_NumberOfRealEstatePropertiesUninhabitable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of uninhabitable homes |  |  |  | 240 avb_NumberOfUnitsInRealEstatePropertyUninhabitable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of apartment homes included in operating apartment communities owned |  |  |  | 168 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Loss Contingency New Class Action Claims Filed Number |  |  |  | 3 avb_LossContingencyNewClassActionClaimsFiledNumber / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Percentage of the first $50,000,000 of losses for which the Company is liable |  |  |  | 12.00%avb_LossContingencyInsurancePercentageOfPolicyAmountCompanyIsObligatedToFund / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Amount of losses for determination of Company's self-insurance liability |  |  |  | 50,000,000 avb_LossContingencyInsurancePolicyAmountForCalculatingSelfInsuranceLiability / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Fixed Rate Secured Mortgage Note 5.95% Interest Rate Due In May 2019 | Secured notes | Avalon at Edgewater |  |  |  |
Subsequent events |  |  |  |
Effective interest rate (as a percent) | 5.95%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = avb_FixedRateSecuredMortgageNote5.95InterestRateDueInMay2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |  |
Debt outstanding | $ 75,012,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = avb_FixedRateSecuredMortgageNote5.95InterestRateDueInMay2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |  |

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- Definition The net cash inflow or outflow from other real estate partnerships not otherwise defined in the taxonomy (buyouts, other agreements). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner. + 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 (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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