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Real Estate - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) Building
Net gain on sales of real estate properties | $ 531,807 | $ 447,637 | $ 256,810
Net gain on sales of land parcels | $ 34,234 | 2,044 | 987
Net gain on sales of unconsolidated entities |  | $ 69,500 |
Non-cash asset impairment charge |  |  | $ 702
San Francisco [Member] |  |  |
Number of buildings damaged due to fire | Building |  |  | 1

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