Fair Values of Derivative Instruments Designated as Hedging Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Total asset derivatives	$ 1,279	$ 204
Total liability derivatives	598	633
Other assets - current | Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Total asset derivatives	1,279	204
Derivative Liabilities - Current | Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Total liability derivatives	$ 598	$ 633