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Share-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 9 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
2008 Incentive Compensation Plan [Member]
Sep. 30, 2014
Non-Employee Directors' Stock Options [Member]
Sep. 30, 2014
Employee Stock Option [Member]
Sep. 30, 2014
Restricted Stock Shares [Member]
Dec. 31, 2013
Restricted Stock Shares [Member]
Jun. 30, 2014
Deferred Stock Units to be Settled in Shares [Member]
Sep. 30, 2014
Restricted Stock Units RSU [Member]
Dec. 31, 2013
Restricted Stock Units RSU [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       6,100,000              
Shares issuable upon exercise of outstanding options 4,041,000 4,041,000 3,900,000 4,000,000              
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 641,000 641,000 760,000       50,000 221,000   591,000 539,000
Number of shares to reduce shares available to grant by upon vesting of deferred stock units 117,000 117,000 0                
Estimated pretax compensation expense $ 6.0 $ 6.0                  
Estimated pretax compensation expenses expiration, years   4 years                  
Employee stock options exercisable in percentage           25.00%          
Service period in years   4 years       4 years 4 years   3 years    
Expiration period in years         10 years 10 years          
Vesting period in years         4            
Restricted stock awards settled in stock exercisable in percentage   25.00%                  
Long-term incentive, cash-based awards   3 years         3 years        
Restricted stock awards settled in cash exercisable in percentage   25.00%                  
Stock compensation and recognized liability 0.8 3.2                  
Fair value of the liability incurred through   3.0                  
Performance unit award expenses $ 1.2