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Derivatives and Hedging Activities - Additional Information (Detail) - Derivatives designated as cash flow hedging instruments - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in income, net $ 69,000 $ 59,000 $ 191,000 $ 58,000  
Foreign exchange forward and option contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Notional principal amount of Hedging Contracts $ 2,550,000   $ 2,550,000   $ 3,200,000