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Derivatives and Hedging Activities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2013 Derivatives not qualified as hedging instruments	Sep. 30, 2012 Derivatives not qualified as hedging instruments	Sep. 30, 2013 Derivatives not qualified as hedging instruments	Sep. 30, 2012 Derivatives not qualified as hedging instruments	Sep. 30, 2013 Derivatives not qualified as hedging instruments Foreign exchange contracts	Dec. 31, 2012 Derivatives not qualified as hedging instruments Foreign exchange contracts	Sep. 30, 2013 Derivatives designated as cash flow hedging instruments	Sep. 30, 2012 Derivatives designated as cash flow hedging instruments	Sep. 30, 2013 Derivatives designated as cash flow hedging instruments	Sep. 30, 2012 Derivatives designated as cash flow hedging instruments	Sep. 30, 2013 Derivatives designated as cash flow hedging instruments Foreign exchange contracts	Dec. 31, 2012 Derivatives designated as cash flow hedging instruments Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal amount of Hedging Contracts					$ 0	$ 2,610					$ 1,500	$ 5,400
Gain (loss) recognized in income, net	$ 0	$ 5	$ 112	$ 17			$ 164	$ 82	$ 452	$ 222