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Stock Compensation Plans - 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]      
Grant of incentive and non-qualified options 431,667    
Stock option granted, weighted average grant date fair value $ 11.78 $ 11.45 $ 12.29
Stock option exercised, intrinsic value $ 2.7 $ 6.9 $ 2.3
Stock option expenses including selling general and administrative expenses 2.9    
Weighted average grant date fair value non vested restricted stock units granted $ 55.77 $ 56.60 $ 57.09
Non vested restricted stock expense including selling general and administrative expense 5.7    
2000 Stock Compensation Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of common stock authorized to be issued under plan 4,000,000    
Exercise price of common stock 0.25    
Unrecognized compensation expense 14.3    
Shares available for future grants 1,252,050    
2000 Stock Compensation Plan | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period of option granted, in years 3 years    
2000 Stock Compensation Plan | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period of option granted, in years 5 years    
Expiration period of option granted, after the date of grant in years 10 years    
2000 Stock Compensation Plan | Common Stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant of incentive and non-qualified options 32,076    
2000 Stock Compensation Plan | Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant of restricted stock awards 9,960    
2000 Stock Compensation Plan Restricted Stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of common stock authorized to be issued under plan 800,000    
2000 Stock Compensation Plan Restricted Stock | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period of option granted, in years 1 year    
2000 Stock Compensation Plan Restricted Stock | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period of option granted, in years 3 years    
2008 Stock Incentive Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of common stock authorized to be issued under plan 2,500,000    
Unrecognized compensation expense $ 14.3    
2008 Stock Incentive Plan | Common Stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant of incentive and non-qualified options 399,591    
2008 Stock Incentive Plan | Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant of restricted stock awards 168,730    
2008 Stock Incentive Plan Stock Appreciation Rights
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of common stock authorized to be issued under plan 875,000