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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details) $ in Thousands, ft² in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 04, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) ft² | Dec. 31, 2020 USD ($) | Dec. 28, 2021 USD ($) | Apr. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 08, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  | $ 100,882 |  | $ 153,886 | $ 100,882 |  |  | $ 114,943 |  | $ 111,775
Investment Owned At Cost |  | $ 1,881 |  | 3,811 | $ 1,881 |  |  |  |  |
Acadia Brandywine Holdings, LLC |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 22.22% |  |  | 22.22% |  |  |  |  |
Riverdale |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Venture Capital Gain (Loss), Net |  |  |  | 3,200 |  |  |  |  |  |
Proceeds from sale of property | $ 10,500 |  |  |  |  |  |  |  |  |
Repayment related to mortgage | 7,900 |  |  |  |  |  |  |  |  |
Recognized gain in shares amount | 600 |  |  |  |  |  |  |  |  |
1238 Wisconsin Avenue |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Construction loan commitment |  |  |  |  |  | $ 12,800 |  |  |  |
Origination fee |  |  |  |  |  | $ 100 |  |  |  |
Subscription Agreement [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
General Partners' Contributed Capital |  |  |  | 5,400 |  |  |  |  |  |
Increase in Investment |  |  |  | 1,900 |  |  |  |  |  |
Investment Owned At Cost |  |  |  | 7,500 |  |  |  |  |  |
Core Portfolio |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments |  | $ 121,011 |  | 119,150 | $ 121,011 |  |  | $ 200 | $ 1,800 |
Increase in Investment |  |  |  | 1,900 | $ 400 |  |  |  |  |
Investment Owned At Cost |  |  |  | $ 3,700 |  |  |  |  |  |
Impairment of Investment |  |  | $ 400 |  |  |  |  |  |  |
Total Commitment |  |  |  |  |  |  |  |  | $ 5,000 |
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, controlling interest percentage |  |  |  |  |  |  | 100.00% |  |  |
Square footage of real estate property (in square feet) | ft² |  |  |  | 1 |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 100.00% |  |  |  |  |  |
Cost method investment ownership percentage |  |  |  |  |  |  | 24.78% |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  | $ 140,000 |  |  |  |  |  |
Core Portfolio | Fifth Wall Ventures Retail Fund, L.P. |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment Owned At Cost |  |  |  |  |  |  | $ 400 |  |  |
Impairment of Investment |  | $ 400 |  |  |  |  |  |  |  |
Core Portfolio | Town Center |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage by third party |  |  |  |  |  |  | 24.78% |  |  |

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