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Derivative Instruments - Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Detail) - Derivatives designated as hedging instruments - Foreign currency forward exchange contracts - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI $ (24,009) $ 974 $ (63,999) $ 642
Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated OCI to Statements of Operations $ (9,241) $ 2,157 $ (6,648) $ 12,472