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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in OCI $ 974 $ 8,866 $ 642 $ 32,367
Cost of Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) reclassified from accumulated OCI to statements of operations $ 2,157 $ 19,152 $ 12,472 $ 41,708