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Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) $ in Thousands | Mar. 31, 2020 USD ($) Property ApartmentUnit | Dec. 31, 2019 USD ($)
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Properties | Property | 306 |
Apartment units | ApartmentUnit | 79,065 |
Total assets | $ 20,919,318 | $ 21,172,769
Total liabilities | $ 9,795,290 | 10,164,843
Consolidated VIE [Member] |  |
Variable Interest Entity [Line Items] |  |
Properties | Property | 16 |
Apartment units | ApartmentUnit | 3,399 |
Total assets | $ 744,100 | 754,700
Total liabilities | $ 332,100 | $ 323,100

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