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

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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Investment in Joint Venture - Summarized Activity Related to Investment in Joint Venture (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity Method Investments [Roll Forward]
Beginning Balance			$ 21,755
Share of earnings	$ 1,136	$ 279	1,792	$ 345
Ending Balance	24,147		24,147
Joint Venture
Equity Method Investments [Roll Forward]
Beginning Balance			21,755
Share of earnings			1,792
Foreign currency translation gain			600
Ending Balance	$ 24,147		$ 24,147