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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative [Line Items]    
Net settlement receivable $ 1.2  
Estimated amount of net foreign currency derivative losses in other comprehensive income reclassified to earnings 0.1  
Foreign exchange contracts
   
Derivative [Line Items]    
Notional amount of foreign currency derivative hedges 201.9  
Cash flow
   
Derivative [Line Items]    
Net (Losses) Gains Recognized in OCI $ (0.4) $ 1.6