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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 |
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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.

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