Fair Values of Derivative Instruments Designated as Hedging Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Total asset derivatives	$ 466	$ 1,279
Total liability derivatives	1,212	598
Prepaid Expenses and Other Current Assets | Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Total asset derivatives	466	1,279
Other Current Liabilities | Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Total liability derivatives	$ 1,212	$ 598