Investment in Joint Venture - Summarized Activity Related to Investment in Joint Venture (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Beginning Balance		$ 20,364
Share of earnings		1,681	$ (14,390)	$ 5,211
Ending Balance	$ 20,364	21,755	20,364
Joint Venture
Schedule of Equity Method Investments [Line Items]
Beginning Balance		20,364
Share of earnings		1,681
Foreign currency translation loss		(290)
Impairment	(16,600)	0
Ending Balance	$ 20,364	$ 21,755	$ 20,364