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Investments in Real Estate Ventures at Fair Value - Additional Information (Detail) - USD ($) | 5 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 30, 2019 | Jul. 23, 2019
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Fair value of investment | $ 8,421,000 | $ 8,421,000 | $ 0 |  | $ 9,306,000
Distribution from equity method investment | 1,525,000 |  |  |  |
Recognized loss in fair value due to lower estimated cash flows | 560,000 | 560,000 | $ 0 |  |
Cash invested | 1,200,000 |  |  |  |
Investor's X [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Fair value of investment | $ 7,200,000 | 7,200,000 |  |  | $ 9,300,000
Distribution from equity method investment |  | 1,500,000 |  |  |
Recognized loss in fair value due to lower estimated cash flows |  | 560,000 |  |  |
The Hartford [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Fair value of investment |  |  |  | $ 1,200,000 |
Distribution from equity method investment |  | 0 |  |  |
Recognized loss in fair value due to lower estimated cash flows |  | 0 |  |  |
Cash invested |  | $ 1,200,000 |  |  |

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