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Investments in Real Estate Entities (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Investment in Real Estate Entities |  |
Equity in income of unconsolidated real estate entities | $ 34,566,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 5,223,000 us-gaap_IncomeLossFromEquityMethodInvestments
Gain on sale of communities | 32,490,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal | 0 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Fund II |  |
Investment in Real Estate Entities |  |
Repayments of secured mortgages | 9,395,000 us-gaap_RepaymentsOfSecuredDebt / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = avb_AvalonBayValueAddedFundIILPMember |
Fund II | Eaves Plainsboro [Member] |  |
Investment in Real Estate Entities |  |
Number of apartment homes sold | 776 avb_NumberOfApartmentHomesSold / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_EavesPlainsboroMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = avb_AvalonBayValueAddedFundIILPMember |
Proceeds from sale of real estate | 117,000,000 us-gaap_ProceedsFromSaleOfRealEstate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_EavesPlainsboroMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = avb_AvalonBayValueAddedFundIILPMember |
Gain on sale of communities | 9,660,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_EavesPlainsboroMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = avb_AvalonBayValueAddedFundIILPMember |
Unconsolidated real estate entities |  |
Investment in Real Estate Entities |  |
Number of unconsolidated real estate entities | 6 avb_EquityMethodInvestmentNumberOfUnconsolidatedRealEstateEntities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_UnconsolidatedRealEstateEntitiesMember |
Unconsolidated real estate entities | Minimum |  |
Investment in Real Estate Entities |  |
Ownership interest percentage | 15.20%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_UnconsolidatedRealEstateEntitiesMember |
Unconsolidated real estate entities | Maximum |  |
Investment in Real Estate Entities |  |
Ownership interest percentage | 31.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_UnconsolidatedRealEstateEntitiesMember |
MVPI LLC [Member] |  |
Investment in Real Estate Entities |  |
Payments for (Proceeds from) Other Real Estate Partnerships | 20,680,000 us-gaap_PaymentsForProceedsFromOtherRealEstatePartnerships / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_MVPILLCMember |
Noncontrolling Interest, Ownership Percentage by Parent | 25.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = avb_MVPILLCMember |
Residual Joint Venture [Member] |  |
Investment in Real Estate Entities |  |
Equity in income of unconsolidated real estate entities | $ 1,857,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = avb_ResidualJointVentureMember |
Number of Limited Liability Company Agreements | 3 avb_NumberofLimitedLiabilityCompanyAgreements / dei_LegalEntityAxis = avb_ResidualJointVentureMember |
Ownership Interest Held by Subsidiaries | 40.00%avb_OwnershipInterestHeldBySubsidiaries / dei_LegalEntityAxis = avb_ResidualJointVentureMember |

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- Definition Represents the number of unconsolidated real estate entities in which the entity had investments as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the number of apartment homes sold during the period. + References No definition available. + Details
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- Definition Represents the percentage of ownership interest held by subsidiaries of the entity. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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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 Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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