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

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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity Method Investments [Roll Forward]
Beginning Balance			$ 20,364
Our share of cumulative earnings	$ (203)	$ 647	66	$ 1,478
Ending Balance	20,406		20,406
Joint Venture
Equity Method Investments [Roll Forward]
Beginning Balance			20,364
Our share of cumulative earnings			66
Foreign currency translation gain			(24)
Ending Balance	$ 20,406		$ 20,406