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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 04, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments carried at fair value or cost |  | $ 3,994 |  | $ 3,994 |  | $ 3,811
Impairment of investments |  | (57,423) |  | (57,423) |  |
Subscription Agreement [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments carried at fair value or cost |  |  |  |  |  | 7,500
General Partners' Contributed Capital |  |  |  |  |  | 5,400
Increase in Investment |  |  |  |  |  | 1,900
Riverdale |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Repayment related to mortgage | $ 7,900 |  |  |  |  |
Recognized gain in shares amount | 600 |  |  |  |  |
Proceeds from sale of property | $ 10,500 |  |  |  |  |
Venture Capital Gain (Loss), Net |  |  |  |  |  | $ 3,200
Core Portfolio | Fifth Wall Ventures Retail Fund, L.P. |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments carried at fair value or cost |  | $ 200 |  | $ 200 |  |

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