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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issuable upon exercise of outstanding options 3,004,000   3,004,000 3,782,000
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 670,000   670,000 599,000
Number of shares to reduce shares available to grant by upon vesting of deferred stock units 105,000   105,000  
Estimated pretax compensation expense $ 4.0   $ 4.0  
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 0.5   $ 1.0  
Performance unit award expenses $ 1.0 $ 0.3 $ 0.7  
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 [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 Shares [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 1,000   1,000 43,000
Restricted Stock Shares [Member] | Share-based Compensation Award, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period in years     4 years  
Restricted Stock Shares [Member] | Share-based Compensation Award, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
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  
Restricted Stock Units RSU [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 669,000   669,000 556,000
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 subject to any other form of award     1.67  
Common stock available for future share-based awards 6,300,000   6,300,000  
Shares issuable upon exercise of outstanding options 3,000,000   3,000,000