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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Taxes [Line Items]        
Income tax benefit rate 25.10%   15.00% 20.30%
Income tax provision (benefit) $ 18.9 $ 2.5 $ 10.4 $ (7.4)
Settlement of tax disputes   5   10
Foreign [Member]
       
Income Taxes [Line Items]        
Payments made to a foreign jurisdiction 4   14  
Interest paid to foreign jurisdiction      $ 2