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Share-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted to employees, expiration period (In years) 10 years    
Cash settled Stock Appreciation rights issued 640,000    
Cash received from option exercises $ 7.9 $ 15.6 $ 10.3
Tax benefit realized from stock options exercised 1.4 3.6 2.0
Intrinsic value of options exercised 3.1 10.3 6.0
Released intrinsic value 3.5 1.7 1.4
Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options and restricted shares vesting period (In years) 3 years    
Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options and restricted shares vesting period (In years) 6 years    
Stock Appreciation Rights (SARs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash settled Stock Appreciation rights issued 5,668 63,000  
Unrecognized compensation cost related to unvested 0.6    
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested 16.9    
Expected to be recognized, weighted-average period (In years) 2 years 10 months 24 days    
Restricted Stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested 25.4    
Expected to be recognized, weighted-average period (In years) 2 years 10 months 24 days    
Fair value, vested 16.9 14.0 12.6
Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested 3.4    
Expected to be recognized, weighted-average period (In years) 2 years    
Fair value, vested $ 4.0 $ 5.3 $ 7.0
2004 Long-Term Incentive Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares of common stock 3,000,000    
Common stock available for grant 17,107    
2004 Long-Term Incentive Plan | Restricted Or Unrestricted Shares Or Other Share-Based Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares of common stock 600,000    
2006 Global Long-Term Incentive Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares of common stock 3,500,000    
Common stock available for grant 182,688    
2006 Global Long-Term Incentive Plan | Restricted Or Unrestricted Shares Or Other Share-Based Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares of common stock 1,100,000    
2006 Global Long-Term Incentive Plan | Share-Based Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock available for grant 62,810    
2009 Omnibus Incentive Compensation Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares of common stock 6,000,000    
Common stock available for grant 1,501,210    
2009 Omnibus Incentive Compensation Plan | Restricted Or Unrestricted Shares Or Other Share-Based Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares of common stock 5,400,000