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Effect of Derivative Instruments in Cash Flow Hedging Transactions on Income and Other Comprehensive Income (Detail) (Foreign exchange forward contracts and put options contracts, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gains on Derivatives Recognized in OCI	$ 176	$ 523
Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on Derivatives Reclassified from OCI into Income	$ 141	$ (39)

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References+ Details