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Share-Based Compensation - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2013
Employee Stock Option [Member]
Sep. 30, 2013
Restricted Stock Shares [Member]
Jun. 30, 2013
Stock Appreciation Rights (SARs) [Member]
Sep. 30, 2013
Restricted Stock Units to be Settled in Cash [Member]
Sep. 30, 2013
Restricted Stock Units to be Settled in Cash [Member]
Sep. 30, 2013
Non-Employee Directors' Stock Options [Member]
Sep. 30, 2013
Non-Employee Directors' Stock Options [Member]
Scenario One [Member]
Sep. 30, 2013
Non-Employee Directors' Stock Options [Member]
Scenario Two [Member]
Sep. 30, 2013
2008 Incentive Compensation Plan [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [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                     10,200,000
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 4,600,000 4,600,000                  
Estimated pretax compensation expense $ 8,000,000 $ 8,000,000                  
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 4 years            
Restricted stock awards exercisable in percentage   25.00%                  
Fair value of outstanding cash settlement on RSU's           6.8 6.8        
Compensation-Stock Compensation and recognized a liability           500,000 1,200,000        
Grant date fair value of the performance unit awards granted during the first quarter   2,500,000                  
Fair value of the liability incurred through 100,000 300,000                  
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%