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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Derivative    
Net contract notional amount of foreign exchange forward contracts $ 21,000,000 $ 17,000,000
Foreign Exchange Contract    
Derivative    
Contract notional amount of foreign exchange forward contracts $ 95,000,000 $ 116,000,000