Financial Instruments - Derivative Instruments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	$ 8,120	$ 3,539
Total Fair Value, Derivative Liabilities	5,964
Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	7,957	3,211
Total Fair Value, Derivative Liabilities	4,770	5,529
Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	163	328
Total Fair Value, Derivative Liabilities	1,194
Fair Value of Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	4,816	1,004
Total Fair Value, Derivative Liabilities	2,374
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	4,653	676
Total Fair Value, Derivative Liabilities	1,180	5,251
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	163	328
Total Fair Value, Derivative Liabilities	1,194
Fair Value of Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	3,304	2,535
Total Fair Value, Derivative Liabilities	3,590
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Foreign currency contracts [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	3,304	2,535
Total Fair Value, Derivative Liabilities	$ 3,590	$ 278