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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issuable upon exercise of outstanding options 3,234,000   3,234,000   2,658,000
Estimated pretax compensation expense $ 6.0   $ 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 1.1   $ 2.0    
Performance unit award credit (expense) $ (0.6) $ (0.1) $ (0.9) $ 0.3  
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 [Member]          
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 Arrangement By Share Based Payment Award [Line Items]          
Service period in years     4 years    
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     3 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 [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards settled in stock exercisable in percentage     30.00%    
Service period in years     3 years    
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    
2016 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 4,100,000   4,100,000    
Shares issuable upon exercise of outstanding options 200,000   200,000    
2008 Incentive Compensation Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issuable upon exercise of outstanding options 3,000,000   3,000,000    
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 1,800,000   1,800,000    
2008 Incentive Compensation Plan [Member] | 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%    
Maximum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 100,000   100,000