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Derivative Instruments - Information Regarding the Effect of the Forward Contracts, Net of the Underlying Exposure, on the Consolidated Statements of Operations (Detail) (Foreign Currency Gain (Loss) [Member], Currency Forward Contracts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Foreign Currency Gain (Loss) [Member] \| Currency Forward Contracts [Member]
Information regarding the effect of the forward contracts, net of the underlying exposure, on the Consolidated Statements of Operations
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (722)	$ 34	$ 62

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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