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Real Estate Disposition Activities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 community land_parcel | Mar. 31, 2014
Summary of income from discontinued operations |  |
Gain on sale of discontinued operations | $ 0 us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations | $ 37,869 us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations
Gain on sale of communities | 79,033 us-gaap_GainLossOnSaleOfProperties | 37,869 us-gaap_GainLossOnSaleOfProperties
Number Of Communities Held For Sale | 1 avb_NumberOfCommunitiesHeldForSale |
Number of Land Parcels Held For Sale | 1 avb_NumberofLandParcelsHeldForSale |
Avalon on Stamford Harbor [Member] |  |
Summary of income from discontinued operations |  |
Apartment homes | 323 avb_NumberOfApartmentHomesSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = avb_AvalonOnStamfordHarborMember |
Net proceeds | 115,500 us-gaap_ProceedsFromSaleOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = avb_AvalonOnStamfordHarborMember |
Gain on sale of communities | $ 70,936 us-gaap_GainLossOnSaleOfProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = avb_AvalonOnStamfordHarborMember |
Avalon on Stamford Harbor [Member] |  |
Summary of income from discontinued operations |  |
Number of Boat Slips in Marina Communities | 74 avb_NumberOfBoatSlipsInMarinaCommunities / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = avb_AvalonOnStamfordHarborMember |

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- Definition Represents the number of apartment homes sold during the period. + References No definition available. + Details
Name: | avb_NumberOfApartmentHomesSold
Namespace Prefix: | avb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of boat slips in marina communities. + References No definition available. + Details
Name: | avb_NumberOfBoatSlipsInMarinaCommunities
Namespace Prefix: | avb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Communities Held For Sale + References No definition available. + Details
Name: | avb_NumberOfCommunitiesHeldForSale
Namespace Prefix: | avb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Land Parcels Held For Sale + References No definition available. + Details
Name: | avb_NumberofLandParcelsHeldForSale
Namespace Prefix: | avb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of difference between the carrying amount and the sales price of real estate properties sold as part of discontinued operations. + References No definition available. + Details
Name: | us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |