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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 community home | Mar. 31, 2014 | Jan. 31, 2015
Loss Contingencies [Line Items] |  |  |
Number of Real Estate Properties | 254 us-gaap_NumberOfRealEstateProperties |  |
Number of apartment homes included in operating apartment communities owned | 74,178 us-gaap_NumberOfUnitsInRealEstateProperty |  |
Basic and diluted shares outstanding |  |  |
Weighted average common shares - basic | 131,883,741 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 129,288,771 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Weighted average DownREIT units outstanding (in shares) | 7,500 us-gaap_WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted | 7,500 us-gaap_WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted |
Effect of dilutive securities (in shares) | 1,284,532 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 333,286 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |
Weighted average common shares - diluted | 133,175,773 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 129,629,557 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Calculation of Earnings per Share - basic |  |  |
Net income attributable to common stockholders | $ 208,144,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 141,739,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Net income allocated to unvested restricted shares | (529,000)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (232,000)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |
Net income attributable to common stockholders, adjusted | 207,615,000 us-gaap_UndistributedEarnings | 141,507,000 us-gaap_UndistributedEarnings |
Weighted average common shares - basic | 131,883,741 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 129,288,771 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Earnings per common share - basic (in dollars per share) | $ 1.57 us-gaap_EarningsPerShareBasic | $ 1.09 us-gaap_EarningsPerShareBasic |
Calculation of Earnings per Share - diluted |  |  |
Net income attributable to common stockholders | 208,144,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 141,739,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations | 9,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest | 9,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest |
Adjusted net income available to common stockholders | 208,153,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 141,748,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Weighted average common shares - diluted | 133,175,773 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 129,629,557 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Earnings per common share - diluted (in dollars per share) | $ 1.56 us-gaap_EarningsPerShareDiluted | $ 1.09 us-gaap_EarningsPerShareDiluted |
Options to purchase shares of common stock excluded from computation of earnings per share amount (in shares) |  | 605,899 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Estimated forfeiture rate of stock options (as a percent) | 1.00%avb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAnnualForfeitureRate |  |
Avalon at Edgewater [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Number of Real Estate Properties | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Number Of Real Estate Properties, Uninhabitable | 1 avb_NumberOfRealEstatePropertiesUninhabitable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Number Of Units In Real Estate Property, Uninhabitable | 240 avb_NumberOfUnitsInRealEstatePropertyUninhabitable / 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 Class Action Claims Filed Number | 4 avb_LossContingencyNewClassActionClaimsFiledNumber / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Loss Contingency, Number of Plaintiffs | 100 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Loss Contingency, Insurance, Percentage Of Policy Amount Company Is Obligated To Fund | 12.00%avb_LossContingencyInsurancePercentageOfPolicyAmountCompanyIsObligatedToFund / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Loss Contingency, Insurance, Policy Amount For Calculating Self-Insurance Liability |  |  | 50,000,000 avb_LossContingencyInsurancePolicyAmountForCalculatingSelfInsuranceLiability / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember
Fixed Rate Secured Mortgage Note 5.95% Interest Rate Due In May 2019 [Member] | Secured notes | Avalon at Edgewater [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.95%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = avb_FixedRateSecuredMortgageNote5.95InterestRateDueInMay2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |
Long-term Debt, Gross | $ 74,718,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = avb_FixedRateSecuredMortgageNote5.95InterestRateDueInMay2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonAtEdgewaterMember |  |

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