Fair Value of Financial Instruments - Foreign Currency Exchange Contracts Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - Foreign Currency Forward Contracts - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency forward contracts —asset position	$ 3,524	$ 680
Foreign currency forward contracts —liability position	(85)	(342)
Total foreign currency derivative instruments	3,439	338
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency forward contracts —asset position	3,524	680
Foreign currency forward contracts —liability position	(85)	(342)
Total foreign currency derivative instruments	$ 3,439	$ 338