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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
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Net gain (loss) recognized in OCI $ 326 $ 1,148 $ (3,107) $ (2,372)
Net (loss) gain reclassified from accumulated OCI into income $ (764) $ 857 $ (487) $ 2,766