Derivatives 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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments	$ (7,730)	$ (26,340)	$ (49,748)	$ (15,885)
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	(14,711)	(26,632)	(55,033)	(16,863)
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	896	$ 292	(3)	$ 978
Cross currency swap contract | 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	$ 6,085		$ 5,288