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Derivatives - Summary of Gains (Losses) on Derivatives Designated as Hedging Instruments (Detail) (Forward Exchange Contracts [Member], Cash Flow Hedging [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Forward Exchange Contracts [Member] | Cash Flow Hedging [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Net (loss) gain recognized in OCI $ (334) $ 1,779
Net (loss) gain reclassified from OCI into income $ (94) $ 203