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Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Fair Value, Measurement Inputs, Disclosure [Line Items]      
Maturity period limit of foreign currency exchange instruments (in months) 1 month    
Net fair value gain on foreign exchange forward contracts $ (0.5) $ (0.9)  
Difference between carrying amount and fair value of long-term debt 18   15
Other Income Expense Net
      
Fair Value, Measurement Inputs, Disclosure [Line Items]      
Gain(loss) on foreign exchange forward contracts 8.0 (2.7)  
Prepaid Expenses and Other Current Assets
      
Fair Value, Measurement Inputs, Disclosure [Line Items]      
Net fair value gain on foreign exchange forward contracts 1.3 1.8  
Other Accrued Liabilities
      
Fair Value, Measurement Inputs, Disclosure [Line Items]      
Net fair value gain on foreign exchange forward contracts 1.8 2.7  
Foreign Exchange Contract
      
Fair Value, Measurement Inputs, Disclosure [Line Items]      
Notional amount of foreign exchange forward contracts not designated as hedging instruments $ 525.1 $ 469.1