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Impact from Foreign Exchange Derivative Instruments Designated as Cash Flow Hedges (Detail) - Cash Flow Hedge - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Loss recorded in accumulated other comprehensive loss $ (423) $ (1,086)
Gain reclassified from accumulated other comprehensive loss into earnings $ (243) $ (1,066)