Financial Instruments - Derivative Instruments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	$ 3,539	$ 15,092
Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	3,211	14,806
Total Fair Value, Derivative Liabilities	5,529	(5,422)
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	328	286
Fair Value of Derivatives Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	1,004	9,619
Fair Value of Derivatives Designated as Hedging Instrument [Member] | Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	676	9,333
Total Fair Value, Derivative Liabilities	5,251	(3,368)
Fair Value of Derivatives Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	328	286
Fair Value of Derivatives Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	2,535	5,473
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	2,535	5,473
Total Fair Value, Derivative Liabilities	278	(2,054)
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets