Derivatives Not Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Detail) (Not Designated As Hedging Instrument, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments	$ 20,695	$ 30,882
Foreign Exchange Forward | Non-Operating Income/Expense Classification
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments	20,448	29,182
Foreign Exchange Forward | Cost of Sales Classification
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments	$ 247	$ 1,700