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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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) recognized in OCI $ 5,914 $ (3,748) $ (984)
Net (loss) gain reclassified from OCI into income $ (1,414) $ 3,520 $ (160)