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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) gain recorded in accumulated other comprehensive loss $ (1,280) $ 536 $ (1,399) $ (2,033)
Loss (gain) reclassified from accumulated other comprehensive loss into earnings $ 88 $ 129 $ (1,092) $ 674