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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Net gain (loss) recognized in OCI $ 29 $ (14) $ (4,242) $ (3,433)
Net (loss) gain reclassified from accumulated OCI into income $ (934) $ (419) $ (482) $ 277