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Impact from Foreign Exchange Derivative Instruments Designated as Cash Flow Hedges (Detail) - Cash Flow Hedge - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Loss recorded in accumulated other comprehensive loss $ (961) $ (1,321)
Gain (loss) reclassified from accumulated other comprehensive loss into earnings $ (491) $ 442