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Gains and Losses Related to Derivative Financial Instruments Not Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Not Designated as Hedging Instrument | Foreign exchange contract | Selling, general and administrative expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in Income on Derivative $ 403 $ 161 $ 1,271 $ 283