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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jurisdictions
Jun. 30, 2012
May 14, 2013
Dec. 31, 2012
Operations And Summary Of Significant Accounting Policies [Line Items]            
Proceeds from sale of Stone Energy Corporation common stock available for sale     $ 13,392,000 $ 37,705,000    
Sale price of discontinued properties         823,700,000  
Realized gain on discontinued properties, net of taxes 230,600,000   230,600,000      
Impairment charges for unevaluated properties 9,500,000   11,900,000 1,300,000    
Impairment charges related to oil and gas properties 700,000   700,000 5,400,000    
Realized gains (losses) on oil price swaps 2,900,000 2,700,000 5,200,000 1,400,000    
Unrealized gain (loss) on derivative financial instrument due to change in fair value 3,524,000   3,524,000     11,651,000
Unrealized gain (loss) from derivatives 640,000 34,797,000 (8,127,000) 24,610,000    
Stock-based compensation expense recognized     6,440,000 6,860,000    
Interest costs, capitalized during period 700,000 5,400,000 3,700,000 10,600,000    
State jurisdictions currently under review     2      
Customary rate 35.00% 35.00% 35.00% 35.00%    
Restricted Stock
            
Operations And Summary Of Significant Accounting Policies [Line Items]            
Shares of unvested restricted stock outstanding 1,519,889   1,519,889     1,960,835
Weighted average grant date fair value of restricted stock grants per share $ 24.02   $ 24.02      
Unrecognized compensation cost 14,300,000   14,300,000      
Period in which compensation cost expected to be recognized     2 years      
Performance Stock Units
            
Operations And Summary Of Significant Accounting Policies [Line Items]            
Unrecognized compensation cost 3,700,000   3,700,000      
Period in which compensation cost expected to be recognized     1 year 8 months 12 days      
Number of performance share units, outstanding     249,302      
Grant date fair value of share units, per unit     $ 21.19      
Performance Multiplier, minimum     0.00%      
Performance Multiplier, maximum     300.00%      
Stock Options
            
Operations And Summary Of Significant Accounting Policies [Line Items]            
Unrecognized compensation cost 0   0      
Number of Options Outstanding 115,150   115,150      
Weighted average exercise price $ 32.90   $ 32.90      
Number of option, Exercised     0 0    
General and Administrative Expense
            
Operations And Summary Of Significant Accounting Policies [Line Items]            
Stock-based compensation expense recognized 3,200,000 3,400,000 6,400,000 6,900,000    
Common Stock Marketable Securities
            
Operations And Summary Of Significant Accounting Policies [Line Items]            
Shares of Stone Energy Corporation common stock held by company           600,000
Shares of Stone Energy Corporation common stock sold by Company       1,206,000    
Proceeds from sale of Stone Energy Corporation common stock available for sale     13,400,000 37,700,000    
Realized gain on available-for-sale securities before income tax     7,900,000 26,600,000    
Cost basis of Stone Energy Corporation common stock sold $ 5,500,000   $ 5,500,000