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Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) $ in Thousands | Sep. 30, 2019 USD ($) Property ApartmentUnit | Dec. 31, 2018 USD ($)
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Properties | Property | 308 |
Apartment units | ApartmentUnit | 80,299 |
Total assets | $ 21,054,056 | $ 20,394,209
Total liabilities | $ 10,152,058 | 9,615,454
Consolidated VIE [Member] |  |
Variable Interest Entity [Line Items] |  |
Properties | Property | 17 |
Apartment units | ApartmentUnit | 3,535 |
Total assets | $ 711,500 | 713,600
Total liabilities | $ 325,500 | $ 313,900
Consolidated VIE [Member] | Consolidated Joint Venture [Member] |  |
Variable Interest Entity [Line Items] |  |
Ownership Percentage | 90.00% |
Consolidated VIE [Member] | General Partner and Developer [Member] | Consolidated Joint Venture [Member] |  |
Variable Interest Entity [Line Items] |  |
Ownership Percentage | 10.00% |

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