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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares issuable upon exercise of outstanding options 3,212,000   2,658,000
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 2,000,000    
Estimated pretax compensation expense $ 6.0    
Expiration period in years 4 years    
Service period in years 4 years    
Long-term incentive, cash-based awards 3 years    
Restricted stock awards settled in cash exercisable in percentage 25.00%    
Stock compensation and recognized liability $ 0.9    
Performance unit award credit (expense) $ (0.3) $ 0.4  
Chief Executive Officer [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Service period in years 2 years    
Restricted stock awards settled in cash exercisable in percentage 50.00%    
Share-based Compensation Award, Tranche One [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock awards settled in stock exercisable in percentage 25.00%    
Share-based Compensation Award, Tranche Two [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock awards settled in stock exercisable in percentage 33.33%    
Share-based Compensation Award, Tranche Three      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock awards settled in stock exercisable in percentage 33.33%    
Non-Employee Directors' Stock Options [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Expiration period in years 10 years    
Employee stock options exercisable in percentage 100.00%    
Long-term incentive, cash-based awards 4 years    
Employee Stock Option [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Expiration period in years 10 years    
Service period in years 4 years    
Employee Stock Option [Member] | Share-based Compensation Award, Tranche One [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock awards settled in stock exercisable in percentage 25.00%    
Restricted Stock Units [Member] | Share-based Compensation Award, Tranche One [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock awards settled in stock exercisable in percentage 20.00%    
Service period in years 4 years    
Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Two [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock awards settled in stock exercisable in percentage 50.00%    
Service period in years 3 years    
Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Three      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock awards settled in stock exercisable in percentage 30.00%    
Deferred Stock Units to be Settled in Shares [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Service period in years 3 years    
2008 Incentive Compensation Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock subject to awards of stock options or stock appreciation rights payable in shares 1.0    
Common stock available for future share-based awards 2,100,000    
Shares issuable upon exercise of outstanding options 3,200,000    
Shares available for future grants 0    
2016 Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares authorized for issuance 4,200,000