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Share-Based Compensation - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 4,500,000 4,500,000
Estimated pretax compensation expense $ 9,000,000 $ 9,000,000
Estimated pretax compensation expenses expiration, years   4 years
Service period in years   4 years
Long-term incentive, cash-based awards   3 years
Restricted stock awards exercisable in percentage   25.00%
Grant date fair value of the performance unit awards granted during the first quarter   3,800,000
Fair value of the liability incurred through 100,000 200,000
Restricted Stock Units to be Settled in Cash [Member]
    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Fair value of outstanding cash settlement on RSU's 7.7 7.7
Compensation-Stock Compensation and recognized a liability 600,000 700,000
Stock Appreciation Rights (SARs) [Member]
    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Expiration period in years 10 years  
Long-term incentive, cash-based awards 4 years  
SARs to be settled in cash granted 200,000 200,000
Grant date fair value of SARs to be settled in cash $ 200,000 $ 200,000
SARs vesting rate 25.00%  
Employee Stock Option [Member]
    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Employee stock options exercisable in percentage   25.00%
Service period in years   4 years
Expiration period in years   10 years
Non-Employee Directors' Stock Options [Member]
    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Expiration period in years   10 years
Non-Employee Directors' Stock Options [Member] | Scenario One [Member]
    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Vesting period in years   3
Non-Employee Directors' Stock Options [Member] | Scenario Two [Member]
    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Vesting period in years   4
Restricted Stock Shares [Member]
    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Service period in years   4 years
Restricted stock awards exercisable in percentage   25.00%
Long-term incentive, cash-based awards   3 years
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 10,200,000