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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Net (loss) gain recognized in OCI $ (220) $ 326 $ (4,462) $ (3,107)
Net (loss) gain reclassified from accumulated OCI into income $ (1,360) $ (764) $ (1,842) $ 487