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Investments in Real Estate Entities - Narrative of Investment in Real Estate Entities (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) community entity home ft² | Sep. 30, 2017 USD ($) entity | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) community entity home | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Equity method investment |  |  |  |  |  |
Gain on sale of communities |  | $ 107,067 | $ 0 | $ 136,514 | $ 180,256 |
Gain (Loss) on Extinguishment of Debt |  | 0 | $ 0 | (24,162) | (2,461) |
Equity method investment, difference between carrying amount and underlying equity | $ 35,752 | $ 35,752 |  | 35,752 |  | $ 38,015
Number of communities acquired | community | 2 |  |  |  |  |
Payments to Acquire Other Real Estate |  |  |  | $ 228,011 | $ 393,916 |
Sudbury |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Equity method investment, ownership percentage | 60.00% | 60.00% |  | 60.00% |  |
Land | $ 19,200 | $ 19,200 |  | $ 19,200 |  |
Unconsolidated real estate entities |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Number of unconsolidated real estate entities | entity | 5 | 5 |  | 5 |  |
Avalon Bay Value Added Fund II LP |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Equity method investment, ownership percentage | 31.30% | 31.30% |  | 31.30% |  |
Number of Apartment Communities Sold | community |  |  |  | 3 |  |
Percentage of right of distribution | 40.00% | 40.00% |  | 40.00% |  |
Percentage of right of remaining distribution | 60.00% | 60.00% |  | 60.00% |  |
Proceeds from equity method investment, dividends or distributions |  | $ 19,977 |  | $ 26,742 |  |
Avalon Brooklyn Bay |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Variable interest entity, qualitative or quantitative information, ownership percentage |  |  |  | 70.00% |  |
Variable interest entity, ownership interest by partner |  |  |  | 30.00% |  |
Due from related parties | $ 41,485 | $ 41,485 |  | $ 41,485 |  |
Minimum | Unconsolidated real estate entities |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Equity method investment, ownership percentage | 20.00% | 20.00% |  | 20.00% |  |
Maximum [Member] | Unconsolidated real estate entities |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Equity method investment, ownership percentage | 31.30% | 31.30% |  | 31.30% |  |
The Lodge Denver West |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Number of apartment homes, acquired | home | 252 |  |  |  |  |
Payments to Acquire Other Real Estate | $ 76,750 |  |  |  |  |
Avalon Dunn Loring |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Number of apartment homes, acquired | home | 440 |  |  |  |  |
Retail square feet acquired | ft² | 27,000 |  |  |  |  |
Payments to Acquire Other Real Estate | $ 151,000 |  |  |  |  |
Eaves Gaithersburg | Avalon Bay Value Added Fund II LP |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Number of Apartment Homes Sold | home |  |  |  | 684 |  |
Proceeds from Sale of Real Estate |  |  |  | $ 117,000 |  |
Gain on sale of communities |  |  |  | 8,697 |  |
Repayments of secured mortgages |  |  |  | $ 127,179 |  |
Briarwood Apartments | Avalon Bay Value Added Fund II LP |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Number of Apartment Homes Sold | home |  |  |  | 348 |  |
Proceeds from Sale of Real Estate |  |  |  | $ 64,750 |  |
Gain on sale of communities |  |  |  | $ 7,873 |  |
Avalon Watchung | Avalon Bay Value Added Fund II LP |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Number of Apartment Homes Sold | home |  |  |  | 334 |  |
Proceeds from Sale of Real Estate |  |  |  | $ 90,300 |  |
Gain on sale of communities |  |  |  | $ 9,752 |  |
Eaves Sunnyvale | US Fund |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Number of Apartment Homes Sold | home |  |  |  | 192 |  |
Proceeds from Sale of Real Estate |  |  |  | $ 107,000 |  |
Gain on sale of communities |  |  |  | 13,788 |  |
Repayments of secured mortgages |  |  |  | 32,542 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 406 |  |

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