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Equity Method Investments Carried At Fair Value - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 23, 2019
Equity Method Investments And Joint Ventures [Abstract] |  |  |  |  |
Fair value of investment | $ 8,603 |  | $ 8,603 |  | $ 9,300
Distribution from equity method investment | 100 |  |  |  |
Recognized loss in fair value due to lower estimated cash flows | $ 606 | $ 0 | $ 606 | $ 0 |

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