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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2020 | Dec. 31, 2020 | Mar. 31, 2021 | Aug. 08, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cost method investments |  | $ 1,881 | $ 2,615 |
Core Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cost method investments |  |  | 2,500 |
Impairment of investments |  | $ 400 |  |
Core Portfolio | Fifth Wall Ventures Retail Fund, L.P. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cost method investments |  |  | $ 1,100 | $ 1,800
Cost method investment ownership percentage |  |  |  | 5.00%
Core Portfolio | Brandywine Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Note receivable exchanged | $ 38,700 |  |  |
Note receivable accrued interest | $ 2,000 |  |  |
Equity method investment, ownership percentage by third party | 24.78% |  |  |
Equity method investment, controlling interest percentage | 100.00% |  |  |

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