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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative [Line Items]          
Net settlement asset $ 2,900,000        
Estimated amount of net foreign currency derivative gains in other comprehensive income reclassified to earnings 1,200,000 $ 1,200,000   $ 1,200,000  
Cash flow hedge [Member]          
Derivative [Line Items]          
Net (losses) gains recognized in OCI   2,400,000 $ 2,900,000 4,400,000 $ 0
Foreign exchange contracts [Member]          
Derivative [Line Items]          
Notional amount of foreign currency derivative hedges $ 204,900,000 $ 204,900,000   $ 204,900,000