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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Incentive Plan, common stock available for issuance 8,700,000    
Plan modification, additional pre-tax stock-based compensation charges     $ 2.4
Incentive Plan, options vesting period 3 years    
Incentive Plan, options maturity period 10 years    
Incentive Plan, weighted-average grant date fair value of stock options granted $ 9.02 $ 5.80 $ 4.20
Unrecognized compensation cost related to unvested option 9.4    
Fair value of options vested 12.4 10.8 10.0
Intrinsic value of stock options exercised 97.1 70.2 10.0
Stock Option
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost, weighted-average recognition period 1 year 8 months 12 days    
Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized pre-tax compensation cost 14.2    
Unrecognized compensation cost, weighted-average recognition period 1 year 10 months 24 days    
Fair value of restricted stock units vested 26.9 18.5 0
Performance Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized pre-tax compensation cost $ 11.0    
Unrecognized compensation cost, weighted-average recognition period 1 year 8 months 12 days    
Outside Directors
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock awards issued 24,672 52,208  
Common stock issued to outside directors $ 36.47 $ 20.46  
Former Parent
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Incentive Plan, weighted-average grant date fair value of stock options granted     $ 16.98