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Investments in Real Estate Entities (Details 2) (USD $)
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12 Months Ended | 12 Months Ended | |||||||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Nov. 30, 2012
Archstone Enterprise LP
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Dec. 31, 2012
Avalon Del Rey, LLC
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Dec. 31, 2011
Avalon Del Rey, LLC
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Dec. 31, 2010
Avalon Del Rey, LLC
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Dec. 31, 2012
CVP I, LLC
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Dec. 31, 2011
CVP I, LLC
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Dec. 31, 2010
CVP I, LLC
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Dec. 31, 2012
MVP I, LLC
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Dec. 31, 2011
MVP I, LLC
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Dec. 31, 2010
MVP I, LLC
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Dec. 31, 2011
AvalonBay Value Added Fund, L.P.
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Dec. 31, 2010
AvalonBay Value Added Fund, L.P.
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Dec. 31, 2012
AvalonBay Value Added Fund II, L.P
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Dec. 31, 2011
AvalonBay Value Added Fund II, L.P
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Dec. 31, 2010
AvalonBay Value Added Fund II, L.P
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Dec. 31, 2012
Juanita Village
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| Assets: | |||||||||||||||||||
| Real estate, net | $ 1,337,084,000 | $ 1,583,397,000 | |||||||||||||||||
| Other assets | 73,252,000 | 70,233,000 | |||||||||||||||||
| Total assets | 1,410,336,000 | 1,653,630,000 | |||||||||||||||||
| Liabilities and partners' capital: | |||||||||||||||||||
| Mortgage notes payable and credit facility | 943,259,000 | 1,074,429,000 | |||||||||||||||||
| Other liabilities | 20,405,000 | 27,335,000 | |||||||||||||||||
| Partners' capital | 446,672,000 | 551,866,000 | |||||||||||||||||
| Total liabilities and partners' capital | 1,410,336,000 | 1,653,630,000 | |||||||||||||||||
| Combined summary of the operating results of the accounted for using the equity method | |||||||||||||||||||
| Rental and other income | 172,076,000 | 160,066,000 | 114,755,000 | ||||||||||||||||
| Operating and other expenses | (73,955,000) | (71,926,000) | (56,322,000) | ||||||||||||||||
| Gain on sale of communities | 106,195,000 | 22,246,000 | 44,700 | 3,063,000 | |||||||||||||||
| Interest expense, net | (53,904,000) | (50,530,000) | (40,050,000) | ||||||||||||||||
| Depreciation expense | (47,748,000) | (47,920,000) | (36,631,000) | ||||||||||||||||
| Net income | 102,664,000 | 11,936,000 | (18,248,000) | ||||||||||||||||
| Costs in excess of equity in underlying net assets of the respective investments | 7,342,000 | 9,167,000 | |||||||||||||||||
| Summary of the Company's equity in income of unconsolidated entities | |||||||||||||||||||
| Equity in income of unconsolidated entities | 20,914,000 | 5,120,000 | 762,000 | 4,000,000 | 102,000 | 1,000 | 5,394,000 | 4,493,000 | 4,368,000 | 493,000 | (626,000) | (881,000) | 2,204,000 | (1,653,000) | 2,130,000 | (1,053,000) | (1,073,000) | ||
| Equity in income of unconsolidated entities relating to the Company's recognition of promoted interest | 2,865,000 | 2,815,000 | 2,839,000 | 1,856,000 | |||||||||||||||
| Gain on sale of assets | 106,195,000 | 22,246,000 | 44,700 | 3,063,000 | |||||||||||||||
| Transaction costs | $ 9,593,000 | ||||||||||||||||||