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Real Estate - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) Building | Dec. 31, 2017 USD ($)
Net gain on sales of real estate properties | $ 447,637 | $ 256,810 | $ 157,057
Net gain on sales of unconsolidated entities | 69,500 |  |
Net gain on sales of land parcels | $ 2,044 | 987 | 19,167
Non-cash asset impairment charge |  | $ 702 | $ 1,693
San Francisco [Member] |  |  |
Number of buildings damaged due to fire | Building |  | 1 |

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