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Gains and Losses Related to Derivative Financial Instruments Not Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
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 $ 272 $ 694