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Investments in Real Estate Entities - Narrative of Investment in Real Estate Entities (Details) | 6 Months Ended |
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Jun. 30, 2019 USD ($) community home entity | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Equity method investment |  |  |
Equity method investment, difference between carrying amount and underlying equity | $ 30,544,000 |  | $ 31,188,000
Number of Communities Acquired | community | 2 |  |
Payments to Acquire Other Real Estate | $ 152,260,000 | $ 0 |
Unconsolidated real estate entities |  |  |
Equity method investment |  |  |
Number of unconsolidated real estate entities | entity | 6 |  |
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 | $ 12,272,000 |  | $ 12,819,000
Avalon Brooklyn Bay Rental Apartments [Member] |  |  |
Equity method investment |  |  |
Variable interest entity, qualitative or quantitative information, ownership percentage | 100.00% |  |
Avalon Brooklyn Bay Condominiums [Member] |  |  |
Equity method investment |  |  |
Variable interest entity, ownership interest by partner | 100.00% |  |
Minimum | Unconsolidated real estate entities |  |  |
Equity method investment |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |
Maximum | Unconsolidated real estate entities |  |  |
Equity method investment |  |  |
Equity Method Investment, Ownership Percentage | 55.00% |  |
Avalon Southlands [Member] |  |  |
Equity method investment |  |  |
Number of Apartment Homes Acquired | home | 338 |  |
Payments to Acquire Other Real Estate | $ 91,250,000 |  |
Avalon Cerritos [Member] |  |  |
Equity method investment |  |  |
Number of Apartment Homes Acquired | home | 132 |  |
Payments to Acquire Other Real Estate | $ 60,500,000 |  |

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