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Derivatives - Summary of Gains (Losses) on Derivatives Designated as Cash Flow Hedging Instruments (Detail) - Forward Exchange Contracts [Member] - Cash Flow Hedging [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Net gain (loss) recognized in OCI $ 10,079 $ 29 $ 10,145 $ (4,242)
Net loss reclassified from accumulated OCI into income(2) $ (2,648) $ (934) $ (5,188) $ (482)