Investment in Joint Venture - Summarized Activity Related to Investment in Joint Venture (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Beginning Balance	$ 21,755
Share of earnings	3,626	$ 1,681	$ (14,390)
Ending Balance	26,983	21,755
Joint Venture
Schedule of Equity Method Investments [Line Items]
Beginning Balance	21,755
Share of earnings	3,626
Foreign currency translation loss	1,602
Ending Balance	$ 26,983	$ 21,755

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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