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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Net loss recognized in OCI $ (3,748) $ (984) $ (48)
Net gain (loss) reclassified from OCI into income $ 3,520 $ (160) $ 1,086