Other Income (Expense), Net - Components of Other Income Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Income and Expenses [Abstract]
Foreign currency (loss) gain	$ (4,113)	$ 880	$ (5,202)	$ (488)
Equity income	520	0	1,587	0
Other miscellaneous expense	660	308	1,449	601
Total other income (expense), net	$ (2,933)	$ 1,188	$ (2,166)	$ 113