Financial Instruments - Fair Values of Derivative Instruments on Consolidated Balance Sheets (Detail) (Not Designated as Hedging Instrument [Member], Accrued Expenses and Other Current Liabilities [Member], Foreign Currency Forward Contracts [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Current Liabilities [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 211	$ 213
Liability derivatives	$ (2,678)	$ (4,971)