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Equity Method Investments in Real Estate Ventures at Fair Value - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Fair value of equity method investment |  | $ 6,965 |  | $ 6,965 |  | $ 8,421
Distributions |  |  |  | 1,322 | $ 100 |
Change in fair value of equity method investment |  | 46 | $ 606 | 134 | $ 606 |
Level 3 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Fair value of equity method investment |  | 6,965 |  | 6,965 |  | 8,421
Distributions |  |  |  | 1,322 |  |
Change in fair value of equity method investment |  |  |  | (134) |  |
Investors X |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Fair value of equity method investment |  | 5,800 |  | 5,800 |  | 7,200
Distributions |  | 581 |  | 1,239 |  |
Change in fair value of equity method investment |  | (47) |  | (161) |  |
The Hartford |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Fair value of equity method investment |  | 1,100 |  | 1,100 |  | $ 1,100
Distributions |  | $ 24 |  | $ 83 |  |
Percentage of ownership interest | 2.50% |  |  |  |  |
Equity method investment cost | $ 1,200 |  |  |  |  |

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