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Derivatives - Summary of (Losses) Gains on Derivatives Designated as Hedging Instruments (Detail) - Forward Exchange Contracts [Member] - Cash Flow Hedging [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Net loss recognized in OCI $ (3,418) $ (2,090)
Net gain reclassified from accumulated OCI into income $ 696 $ 1,193