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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
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain (loss) recognized in OCI $ 66 $ (4,271)
Net (loss) gain reclassified from accumulated OCI into income $ (2,539) $ 452