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Derivative Instruments - Derivatives Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Detail) - Designated As Hedging Instrument - Foreign Exchange Forward - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in OCI $ 37,926 $ 39,931 $ (13,103)
Cost of Sales Classification      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from accumulated OCI to statements of operations $ 52,588 $ (883) $ (4,897)