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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 04, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Apr. 01, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cost method investments |  | $ 1,881 | $ 3,176 |
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 |  |  |
Mervyns II |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cost method investments |  |  | $ 1,200 |
Core Portfolio | Fifth Wall Ventures Retail Fund, L.P. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cost method investments | 1,300 |  |  | $ 400
Impairment of investments |  | $ 400 |  |
Core Portfolio | Brandywine Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cost method investment ownership percentage |  |  |  | 24.78%
Note receivable exchanged | $ 38,700 |  |  |
Note receivable accrued interest |  |  |  | $ 2,000
Equity method investment, controlling interest percentage |  |  |  | 100.00%

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