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Derivatives - Summary of (Losses) Gains on Derivatives Designated as Cash Flow Hedging Instruments (Detail) - Forward Exchange Contracts [Member] - Cash Flow Hedging [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Net (loss) gain recognized in OCI $ (6,036) $ 5,914 $ (3,748)
Net (loss) gain reclassified from accumulated OCI into income $ (2,685) $ (1,414) $ 3,520