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Stock Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 8.9    
Weighted average period to recognize compensation cost 2 years 3 months 18 days    
Compensation cost on stock-based compensation plans $ 6.2 $ 5.8 $ 11.6
Tax benefit recognized from all stock-based employee compensation plans 2.0 1.9 3.0
Cash received from stock option exercises 1.8 6.9 5.2
Employee service share based compensation tax benefit realized from share based compensation plans $ 3.2 $ 3.2 $ 1.0
Omnibus Incentive 2006 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum grant of stock options, restricted stock, and restricted stock units to directors and employees 4,200,000    
Maximum number of shares other than options or stock appreciation rights granted for awards 700,000    
Omnibus Incentive 2006 Plan [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period for stock option awards 10 years    
Stock options granted 0 0 0
Weighted average remaining contractual term of options outstanding 4 years    
Weighted average remaining contractual term of options exercisable 3 years 3 months 18 days    
Aggregate intrinsic value of options outstanding $ 4.9    
Aggregate intrinsic value of options exercisable 3.5    
Total intrinsic value of options exercised $ 1.8 $ 13.0 $ 4.3
Omnibus Incentive 2006 Plan [Member] | Stock Options [Member] | Non Employee Director [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period from the date of grant for stock option granted 1 year    
Omnibus Incentive 2006 Plan [Member] | Stock Options [Member] | Employee [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period from the date of grant for stock option granted 1 year    
Omnibus Incentive 2006 Plan [Member] | Stock Options [Member] | Employee [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period from the date of grant for stock option granted 4 years    
Omnibus Incentive 2006 Plan [Member] | Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Weighted Average Grant-Date Fair-Value $ 57.21 $ 41.61 $ 43.56
Fair value of restricted stock awards vested $ 14.0 $ 7.0 $ 3.2
Omnibus Incentive 2006 Plan [Member] | Restricted Stock Awards [Member] | Non Employee Director [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period from the date of grant for stock option granted 1 year    
Omnibus Incentive 2006 Plan [Member] | Restricted Stock Awards [Member] | Employee [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period from the date of grant for stock option granted 1 year    
Omnibus Incentive 2006 Plan [Member] | Restricted Stock Awards [Member] | Employee [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable period from the date of grant for stock option granted 4 years