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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 | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Equity Method Investment and Joint Venture, Fair Value Change [Roll Forward] |  |  |  |
Fair value investments, starting balance |  |  | $ 8,421 |
Distributions |  |  | 717 | $ 0
Change in fair value of equity method investment | $ 41 | $ 0 | 88 | $ 0
Fair value investments, ending balance | $ 7,616 |  | $ 7,616 |

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