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Investments in Real Estate Entities (Details) ft² in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) community home investor extension agreement loan ft² mi | Dec. 31, 2017 USD ($) community home | Dec. 31, 2016 USD ($) home | Feb. 27, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain on sale of communities | $ 54,202 | $ 136,333 | $ 196,749 |
Number of apartment homes in communities owned | home | 81,499 |  |  |
Preferred interest obligation redemption and dividends | $ (1,120) | (2,000) | (1,960) |
Gain (loss) on other real estate transactions, net | 345 | (10,907) | 10,224 |
Gain on sale of communities | 374,976 | 252,599 | 374,623 |
Equity method investment, difference between carrying amount and underlying equity | $ 31,188 | 35,402 |  |
Number of communities acquired | community | 4 |  |  |
Payments to acquire other real estate | $ 338,620 | 462,317 | 393,316 |
Expensed transaction, development and other pursuit costs, net of recoveries | 4,309 | 2,736 | 9,922 |
Avalon Arundel Crossing |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire other real estate | $ 83,000 |  |  |
Number of apartment homes acquired | home | 310 |  |  |
Alexander Apartments & Lofts |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire other real estate | $ 103,000 |  |  |
Number of apartment homes acquired | home | 290 |  |  |
Retail square feet acquired | ft² | 2 |  |  |
Ironwood at Red Rocks |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire other real estate | $ 75,400 |  |  |
Number of apartment homes acquired | home | 256 |  |  |
The Meadows |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire other real estate | $ 73,050 |  |  |
Number of apartment homes acquired | home | 240 |  |  |
Acquired Real Estate |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Expensed transaction, development and other pursuit costs, net of recoveries |  | 5,139 |  |
Archstone Enterprise LP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  | 40.00%
Equity Residential and its Operating Partnership and ERP Operating Limited Partnership | Archstone Enterprise LP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  | 60.00%
US Fund |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of extension options | extension | 2 |  |  |
Period of extension (in years) | 1 year |  |  |
Number of institutional investors | investor | 6 |  |  |
Real estate investments, joint ventures | $ 31,194 |  |  |
Equity Method Investment, Ownership Percentage | 28.60% |  |  |
Gain on sale of communities | $ 8,636 | 13,788 |  |
Number of loans secured by individual assets | loan | 5 |  |  |
Debt outstanding | $ 205,846 |  |  |
US Fund | Avalon Kirkland at Carillon |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Apartment homes | home | 131 |  |  |
Net cash proceeds | $ 85,500 |  |  |
Repayments of secured debt | $ 27,928 |  |  |
ACJV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of institutional investors | investor | 4 |  |  |
Real estate investments, joint ventures | $ 34,799 |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |  |
Gain on sale of communities | $ 2,019 |  |  |
Number of loans secured by individual assets | loan | 1 |  |  |
Debt outstanding | $ 111,653 |  |  |
Maximum geographic radius for existing assets within considered for right of first offer | mi | 1 |  |  |
ACJV | Avalon Woodland Park |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Apartment homes | home | 392 |  |  |
Net cash proceeds | $ 94,250 |  |  |
Repayments of secured debt | $ 50,647 |  |  |
MVPI LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 25.00% |  |  |
Number of apartment homes in communities owned | home | 313 |  |  |
Equity in income of unconsolidated entities relating to the Company's recognition of promoted interest |  |  | 16,568 |
Brandywine |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 28.70% |  |  |
Debt outstanding | $ 22,195 |  |  |
Number of apartment homes in communities owned | home | 305 |  |  |
Number of members who hold various interests in joint venture | investor | 5 |  |  |
Residual JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 40.00% |  |  |
Number of LLC agreements | agreement | 3 |  |  |
Legacy JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 40.00% |  |  |
Preferred interest obligation liquidation value | $ 36,806 |  |  |
Sudbury |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 60.00% |  |  |
Land | $ 19,200 |  |  |
AVA North Point |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Real estate investments, joint ventures | $ 45,162 |  |  |
Equity Method Investment, Ownership Percentage | 55.00% |  |  |
Number of apartment homes in communities owned | home | 265 |  |  |
Gain (loss) on other real estate transactions, net | $ 10,621 |  |  |
AVA North Point | Joint Venture Partner |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 45.00% |  |  |
NYC JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Real estate investments, joint ventures | $ 75,000 |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |  |
Variable interest entity, ownership interest by partner | 80.00% |  |  |
Fund II |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of institutional investors | investor | 6 |  |  |
Equity Method Investment, Ownership Percentage | 31.30% |  |  |
Gain on sale of communities |  | $ 26,322 | 41,501 |
Number of apartment communities sold | community |  | 3 |  |
Percentage of right of distribution | 40.00% |  |  |
Percentage of right of remaining distribution | 60.00% |  |  |
Equity in income of unconsolidated entities relating to the Company's recognition of promoted interest | $ 925 | $ 26,472 | $ 7,985 |
Avalon Brooklyn Bay |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Variable interest entity, qualitative or quantitative information, ownership percentage | 70.00% |  |  |
Variable interest entity, ownership interest by partner | 30.00% |  |  |
Due from related parties | $ 12,819 | $ 44,831 |  |
Avalon Brooklyn Bay Condominiums |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Variable interest entity, ownership interest by partner | 100.00% |  |  |
Avalon Brooklyn Bay Rental Apartments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Variable interest entity, qualitative or quantitative information, ownership percentage | 100.00% |  |  |
NYC JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Apartment homes | home | 1,301 |  |  |
Repayments of secured debt | $ 395,939 |  |  |
retail square feet sold | ft² | 58 |  |  |
Wholly Owned Properties |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Apartment homes | home | 3,099 | 1,624 | 2,051 |
Net cash proceeds | $ 883,313 | $ 503,039 | $ 532,717 |
Repayments of secured debt | $ 395,939 | $ 0 | $ 0 |

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