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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issuable upon exercise of outstanding options 2,789,000 2,789,000 3,782,000
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 720,000 720,000 599,000
Number of shares to reduce shares available to grant by upon vesting of deferred stock units 105,000 105,000 117,000
Estimated pretax compensation expense $ 5.0 $ 5.0  
Expiration period in years   4 years  
Stock awards settled in stock exercisable in percentage   33.33%  
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 0.3 $ 0.5  
Performance unit award expenses $ 0.1 $ 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%  
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 6,500,000 6,500,000  
Shares issuable upon exercise of outstanding options 2,800,000 2,800,000  
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  
Stock awards settled in stock exercisable in percentage   25.00%  
Service period in years   4 years  
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 719,000 719,000 556,000