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Real Estate Disposition Activities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 community | Sep. 30, 2013 | Sep. 30, 2014 community | Sep. 30, 2013
Summary of income from discontinued operations |  |  |  |
Number of Apartment Communities Sold |  |  | 3 |
Number Of Communities Held For Sale | 1 |  | 1 |
Gain on sale of discontinued operations | $ 0 | $ 0 | $ 37,869 | $ 118,173
Gain on sale of communities |  |  | 98,814 | 118,413
Avalon Valley [Member] |  |  |  |
Summary of income from discontinued operations |  |  |  |
Apartment homes |  |  | 268 |
Net proceeds |  |  | 53,325 |
Gain on sale of discontinued operations |  |  | 37,869 |
Oakwood Philadelphia [Member] |  |  |  |
Summary of income from discontinued operations |  |  |  |
Apartment homes | 80 |  |  |
Net proceeds | 28,875 |  |  |
Gain on sale of communities | 3,268 |  |  |
Avalon Danvers [Member] |  |  |  |
Summary of income from discontinued operations |  |  |  |
Apartment homes | 433 |  |  |
Net proceeds | 108,500 |  |  |
Gain on sale of communities | $ 41,021 |  |  |

X
- Definition Number Of Operating Apartment Communities Sold + References No definition available. + Details
Name: | avb_NumberofApartmentCommunitiesSold
Namespace Prefix: | avb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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