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Equity Method Investments in Real Estate Ventures at Fair Value - Schedule of Investments in Real Estate Ventures (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Equity Method Investment and Joint Venture, Fair Value Change [Roll Forward] |  |  |  |
Fair value investments, starting balance |  |  | $ 8,421 |
Distributions |  |  | (1,322) | $ (100)
Change in fair value of equity method investment | $ 46 | $ 606 | 134 | $ 606
Fair value investments, ending balance | $ 6,965 |  | $ 6,965 |

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