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Equity - Additional Information (Details) (USD $)
 12 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jul. 31, 2010
Dec. 31, 2012
Awards issued prior to 2006
Period 1
Dec. 31, 2012
Awards issued prior to 2006
Period 2
Dec. 31, 2012
Awards issued prior to 2006
Period 3
Dec. 31, 2012
Awards issued during and after 2006
Jan. 31, 2009
8.5% Convertible perpetual preferred stock
Dec. 31, 2012
8.5% Convertible perpetual preferred stock
Dec. 31, 2011
8.5% Convertible perpetual preferred stock
Dec. 31, 2009
6.0% Convertible perpetual preferred stock
Dec. 31, 2012
6.0% Convertible perpetual preferred stock
Dec. 31, 2011
6.0% Convertible perpetual preferred stock
Nov. 30, 2010
7.0% Convertible perpetual preferred stock
Dec. 31, 2012
7.0% Convertible perpetual preferred stock
Dec. 31, 2011
7.0% Convertible perpetual preferred stock
Jul. 31, 2010
Before Amendment
Dec. 31, 2012
Treasury Stock
Dec. 31, 2011
Treasury Stock
Dec. 31, 2010
Treasury Stock
Dec. 31, 2012
Additional Paid-In Capital
Dec. 31, 2011
Additional Paid-In Capital
Dec. 31, 2010
Additional Paid-In Capital
Dec. 31, 2010
Common Stock
Dec. 31, 2010
Newly Issued Common Stock
Additional Paid-In Capital
Dec. 31, 2010
Newly Issued Common Stock
Common Stock
Dec. 31, 2010
Treasury Stock
Dec. 31, 2010
Treasury Stock
Additional Paid-In Capital
Jul. 16, 2010
Arena Acquisition
Apr. 17, 2012
Dynamic Acquisition
Dec. 31, 2012
Stockholder Rights Plan
Series A Junior Participating Preferred Stock
Right
Dec. 31, 2012
Stockholder Rights Plan
Series A Junior Participating Preferred Stock
Non Institutional Investor
Dec. 31, 2012
Stockholder Rights Plan
Series A Junior Participating Preferred Stock
Institutional Investor
Stockholders Equity Note [Line Items]                                                                    
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000                                                                
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001                                                           $ 0.001    
Preferred stock, shares outstanding (in shares) 7,650,000 7,650,000               2,650,000 2,650,000   2,000,000 2,000,000   3,000,000 3,000,000                                  
Preferred stock, dividend rate, percentage                 8.50%     6.00%     7.00%                                      
Preferred stock, liquidation preference (in dollars per share)                 $ 100     $ 100     $ 100                                      
Preferred stock, number of common stock shares initially issuable upon conversion (in shares)                 12.4805     9.2115     12.8791                                      
Preferred stock, annual dividend per share (in dollars per share)                 $ 8.50     $ 6     $ 7                                      
Preferred stock, conversion start date                 Feb. 20, 2014     Dec. 21, 2014     Nov. 20, 2015                                      
Common stock, shares authorized (in shares) 800,000,000 800,000,000   800,000,000                           400,000,000                                
Common stock issued under legal settlement (in shares)                                                 1,789,000   500,000 1,300,000            
Common stock issued under legal settlement     $ 12,200,000                                   $ 14,033,000     $ (1,835,000) $ 2,000 $ 3,400,000     $ (5,200,000)          
Issuance of common stock in acquisition (in shares)                                                           190,280,000 73,962,000 [1]      
Number of Rights issued per common share                                                               1    
Ownership percentage threshold for Right to become exercisable                                                                 10.00% 15.00%
Days to exercise Right once contingency threshold met                                                               10 days    
Number of shares to be received upon exercise of each Right                                                               0.001    
Redemption price per Right                                                               0.001    
Right expiration date                                                               Nov. 19, 2013    
Exercise price of Right for one preferred share                                                               20,000    
Right exchange ratio                                                               1    
Purchase of treasury stock (in shares) 1,500,000 1,200,000 800,000                                                              
Purchase of treasury stock (11,312,000) (10,834,000) (6,275,000)                               (11,312,000) (10,834,000) (6,275,000)                          
Retirement of treasury stock (in shares) 1,500,000 1,200,000                                                                
Retirement of treasury stock 0 0 0                               11,312,000 10,834,000 11,268,000 (11,312,000) (10,834,000) (11,268,000)                    
Additional paid-in capital - stockholder receivable (5,000,000) 0                                                                
Restricted common stock under incentive compensation plans, vesting period (in years)         1 year 4 years 7 years 4 years                                                    
Stock-based compensation 39,700,000 36,000,000 37,700,000                                                              
Stock based compensation, capitalized 7,500,000 7,600,000 5,600,000                                                              
Total fair value of restricted stock vested during the period, including awards assumed in Arena acquisition 32,100,000 30,200,000 17,500,000                                                              
Unrecognized compensation cost related to unvested restricted stock awards $ 91,000,000                                                                  
Preferred stock, conversion term                 Each share of 8.5% convertible perpetual preferred stock has a liquidation preference of $100.00 and is convertible at the holder’s option at any time initially into approximately 12.4805 shares of the Company’s common stock, subject to customary adjustments in certain circumstances. Each holder of the convertible perpetual preferred stock is entitled to an annual dividend of $8.50 per share to be paid semi-annually in cash, common stock or a combination thereof, at the Company’s election. The 8.5% convertible perpetual preferred stock is not redeemable by the Company at any time. After February 20, 2014, the Company may cause all outstanding shares of the convertible perpetual preferred stock to convert automatically into common stock at the then-prevailing conversion rate if certain conditions are met.     Each share of the 6.0% convertible perpetual preferred stock has a liquidation preference of $100.00 and is entitled to an annual dividend of $6.00 payable semi-annually in cash, common stock or any combination thereof, at the Company’s election. The 6.0% convertible perpetual preferred stock is not redeemable by the Company at any time. Each share is initially convertible into approximately 9.2115 shares of the Company’s common stock, at the holder’s option, subject to customary adjustments in certain circumstances. On December 21, 2014, all outstanding shares of the 6.0% convertible preferred stock will be converted automatically into shares of the Company’s common stock at the then-prevailing conversion rate as long as all dividends accrued at that time have been paid.     Each share of the 7.0% convertible preferred stock has a liquidation preference of $100.00 per share and became convertible at the holder’s option on February 15, 2011, initially into approximately 12.8791 shares of the Company’s common stock, subject to customary adjustments in certain circumstances. The annual dividend on each share of the 7.0% convertible preferred stock is $7.00 payable semi-annually, in cash, common stock or a combination thereof, at the Company’s election beginning on May 15, 2011. The 7.0% convertible perpetual preferred stock is not redeemable by the Company at any time. After November 20, 2015, the Company may cause all outstanding shares of the 7.0% convertible perpetual preferred stock to convert automatically into common stock at the then-prevailing conversion rate if certain conditions are met.                                      
Unrecognized compensation cost related to unvested restricted stock awards, weighted average period of recognition 2 years 6 months 0 days                                                                  
Shares available for grant under existing incentive compensation plans 9,900,000                                                                  
Shareholder receivable, number of annual installments 4                                                                  
[1] Consideration paid by the Company consisted of 74 million shares of SandRidge common stock and cash of approximately $680.0 million. The value of the stock consideration is based upon the closing price of $7.33 per share of SandRidge common stock on April 17, 2012, which was the closing date of the Dynamic Acquisition. Under the acquisition method of accounting, the purchase price is determined based on the total cash paid and the fair value of SandRidge common stock issued on the acquisition date.