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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative [Line Items]        
Net settlement asset     $ 1.0  
Estimated amount of net foreign currency derivative losses in other comprehensive income reclassified to earnings 0.8   0.8  
Foreign exchange contracts
       
Derivative [Line Items]        
Notional amount of foreign currency derivative hedges 274.6   274.6  
Cash flow hedge
       
Derivative [Line Items]        
Net (Losses) Gains Recognized in OCI $ 2.8 $ 1.0 $ (0.1) $ 3.3