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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Forward Exchange Contracts [Member] | Cash Flow Hedging [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Net (loss) gain recognized in OCI $ (1,230) $ (257) $ (1,564) $ 1,359
Net (loss) gain reclassified from OCI into income $ (76) $ 602 $ (151) $ 805