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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in income, net $ 59,000 $ (59,000) $ 58,000 $ (35,000)  
Foreign exchange forward and option contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Notional principal amount of Hedging Contracts $ 4,350,000   $ 4,350,000   $ 4,200,000