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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