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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity Method Investments [Roll Forward]
Beginning Balance			$ 20,364
Our share of cumulative earnings	$ 279	$ 266	345	$ 1,744
Ending Balance	19,877		19,877
Joint Venture
Equity Method Investments [Roll Forward]
Beginning Balance			20,364
Our share of cumulative earnings			345
Foreign currency translation gain			(832)
Ending Balance	$ 19,877		$ 19,877