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Investments in Real Estate Entities - Narrative of Investment in Real Estate Entities (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) home entity | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) community entity home | Jun. 30, 2020 USD ($)
Equity method investment |  |  |  |
Casualty and impairment loss | $ 1,177 | $ 0 | $ 1,177 | $ 0
Payments to Acquire Other Real Estate |  |  | $ 118,572 | 0
AC JV |  |  |  |
Equity method investment |  |  |  |
Number of Apartment Communities Sold | community |  |  | 2 |
Land Parcel [Member] |  |  |  |
Equity method investment |  |  |  |
Casualty and impairment loss | 0 | 0 | $ 0 | 0
The Park Loggia [Member] |  |  |  |
Equity method investment |  |  |  |
Casualty and impairment loss | 0 | $ 0 | 0 | $ 0
Proceeds from Sale of Real Estate | $ 38,392 |  | 53,001 |
Avalon Arundel Crossing East |  |  |  |
Equity method investment |  |  |  |
Number of Apartment Homes Acquired | home | 384 |  |  |
Payments to Acquire Other Real Estate | $ 119,000 |  |  |
Avalon North Point and Avalon North Point Lofts | Notes Payable Maturities 2021 [Member] | Secured Debt [Member] |  |  |  |
Equity method investment |  |  |  |
Repayments of Secured Debt |  |  | $ 111,653 |
Unconsolidated real estate entities |  |  |  |
Equity method investment |  |  |  |
Number of unconsolidated real estate entities | entity | 8 |  | 8 |
AC JV |  |  |  |
Equity method investment |  |  |  |
Proceeds from Sale of Real Estate |  |  | $ 325,000 |
AC JV | Avalon North Point and Avalon North Point Lofts |  |  |  |
Equity method investment |  |  |  |
Number Of Apartment Homes Sold | home |  |  | 529 |
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  | $ 23,305 |
Minimum | Unconsolidated real estate entities |  |  |  |
Equity method investment |  |  |  |
Ownership percentage | 20.00% |  | 20.00% |
Maximum | Unconsolidated real estate entities |  |  |  |
Equity method investment |  |  |  |
Ownership percentage | 50.00% |  | 50.00% |

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