Derivative Instruments - Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Detail) - Designated as hedging instruments - Foreign Exchange Forward - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in OCI	$ (12,584)	$ (15,893)
Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) reclassified from accumulated OCI to statements of operations	$ 2,229	$ 7,010