Summary of Significant Accounting Policies - Other Income (Expense) Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Foreign currency forward contract gain (loss), net	$ (2,917)	$ 2,877	$ 6,356
Foreign currency transaction gain (loss), net	226	(1,611)	(6,198)
Other	1,001	199	(206)
Other income (expense), net	$ (1,690)	$ 1,465	$ (48)