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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative [Line Items]        
Net settlement liability     $ 2,600,000  
Estimated amount of net foreign currency derivative gains (losses) in other comprehensive income reclassified to earnings $ (2,400,000)   (2,400,000)  
Foreign exchange contracts [Member]        
Derivative [Line Items]        
Notional amount of foreign currency derivative hedges 212,200,000   212,200,000  
Cash flow hedge [Member]        
Derivative [Line Items]        
Net (losses) gains recognized in OCI $ 0 $ 2,400,000 $ (8,000,000) $ 4,400,000