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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in OCI $ (27,406) $ 15,561 $ (39,990) $ (332)
Cost of Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) reclassified from accumulated OCI to statements of operations $ 364 $ 3,305 $ 2,593 $ 10,315