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Share-Based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Non-Employee Directors' Stock Options [Member]
Dec. 31, 2013
Non-Employee Directors' Stock Options [Member]
Scenario One [Member]
Dec. 31, 2013
Non-Employee Directors' Stock Options [Member]
Scenario Two [Member]
Dec. 31, 2013
Performance Based Restricted Stock [Member]
Dec. 31, 2013
2008 Incentive Compensation Plan [Member]
Dec. 31, 2013
Employee Stock Option [Member]
Dec. 31, 2013
Restricted Stock Shares [Member]
Jun. 30, 2013
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2013
Restricted Stock Units to be Settled in Cash [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           6,400,000        
Shares issuable upon exercise of outstanding options           3,900,000        
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 500,000                  
Estimated pretax compensation expense $ 6,000,000                  
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    
Expiration period in years   10 years         10 years   10 years  
Vesting period in years     3 4            
Restricted stock awards exercisable in percentage               25.00%    
Long-term incentive, cash-based awards 3 years       3 years     3 years 4 years  
Restricted stock awards exercisable in percentage 25.00%                  
Fair value of outstanding cash settlement on RSU's                   13.0
Compensation-Stock Compensation and recognized a liability                   3,500,000
Grant date fair value of the performance unit awards granted during the first quarter 4,500,000                  
Fair value of the liability incurred through 1,100,000                  
SARs to be settled in cash granted                 200,000  
Grant date fair value of SARs to be settled in cash                 $ 200,000  
SARs vesting rate                 25.00%  
Volatility assumptions for estimating the fair value of stock options minimum 59.40%                  
Volatility assumptions for estimating the fair value of stock options maximum 67.50%