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Share-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation (income) expense $ 4.0 $ 7.4  
Stock options granted 0 1,221,000  
Grant date fair market value of options granted   $ 2.96  
Intrinsic value of options exercised   1.2  
Stock Options
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation (income) expense 0.4 1.1  
Unrecognized share-based compensation cost 2.8    
Options that are expected to vest 1,100,000    
Weighted average fair market value of nonvested options $ 3.31    
Unrecognized compensation expense, weighted-average period of recognition 2 years 4 months 24 days    
Restricted Stock
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation (income) expense 3.2 5.8  
Unrecognized share-based compensation cost 23.1    
Unrecognized compensation expense, weighted-average period of recognition 2 years 6 months    
Equity instruments other than options expected to vest, shares 2,500,000    
Equity instruments other than options expected to vest, weighted-average grant date fair value $ 11.97    
Granted, Shares 1,175,000    
Performance Share Unit Awards
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation (income) expense 0.4 0.5  
Unrecognized share-based compensation cost $ 5.6    
Unrecognized compensation expense, weighted-average period of recognition 2 years 4 months 24 days    
Granted, Shares 485,000    
Equity instruments other than options, payout range , minimum 242,500   117,500
Equity instruments other than options, payout range, maximum 485,000 233,000  
Equity instruments other than options, percentage of expected payout     50.00%