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	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments	$ 5,407	$ 4,702
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	6,317	3,955
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	$ (910)	$ 747