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Derivative Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Not designated as hedging instruments          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Net gain (loss) recognized in the consolidated statements of operations for derivatives not designated as hedging instruments $ 12,223 $ 1,131 $ (42,018) $ 10,455  
Foreign Exchange Forward          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Notional amount 1,210,000 1,430,000 1,210,000 1,430,000 $ 1,190,000
Foreign Exchange Forward | Designated as hedging instruments | Cost of Sales Classification          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Net gain (loss) reclassified from accumulated other comprehensive loss to the consolidated statements of operations for derivatives designated as hedging instruments 13,705 (2,830) 22,556 (5,597)  
Foreign Exchange Forward | Not designated as hedging instruments | Cost of Sales Classification          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Net gain (loss) recognized in the consolidated statements of operations for derivatives not designated as hedging instruments 93 $ (1,085) (899) $ 686  
Cross currency swap contract          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Notional amount $ 30,000   $ 30,000    
Maximum | Foreign Exchange Forward          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Maximum term for foreign currency forward exchange contracts     18 months