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Derivative Instruments - Not Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Detail) - Not designated as hedging instruments - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments $ 24,717 $ (54,241)
Foreign Exchange Forward | Non-operating income/expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments 23,592 (53,249)
Foreign Exchange Forward | Cost of Sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments $ 1,125 $ (992)