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Share-Based Compensation - Stock Options - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock options granted     0 1,221,000
Grant date fair market value of options granted       $ 2.96
Intrinsic value of options exercised $ 0.4 $ 0 $ 0.4 $ 1.2
Share-based compensation (income) expense 7.1 7.4 11.1 14.8
Stock Options
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation (income) expense 0.4 0.7 0.8 1.8
Unrecognized share-based compensation cost $ 2.4   $ 2.4  
Options that are expected to vest 1,000,000   1,000,000  
Weighted average fair market value of nonvested options $ 3.28   $ 3.28  
Unrecognized compensation expense, weighted-average period of recognition     2 years 2 months 12 days