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Gains and Losses Related to Derivative Financial Instruments Not Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Not Designated as Hedging Instrument | Foreign exchange contract | Selling, General and Administrative Expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative $ 1,468 $ (1,377) $ (47) $ (1,566)