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Variable Interest Entities - Royalty Trusts - Ownership Interest (Details) | Dec. 31, 2012 SandRidge Mississippian Trust I | Dec. 31, 2011 SandRidge Mississippian Trust I | Apr. 30, 2011 SandRidge Mississippian Trust I | Dec. 31, 2012 SandRidge Permian Trust | Dec. 31, 2011 SandRidge Permian Trust | Aug. 31, 2011 SandRidge Permian Trust | Dec. 31, 2012 SandRidge Mississippian Trust II | Apr. 30, 2012 SandRidge Mississippian Trust II
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Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beneficial interest owned by Company | 26.90% | 38.40% | 38.40% | [1] | 30.50% | 34.30% | 34.30% | [1] | 39.90% | 39.90% | [1]
[1] | During the year ended December 31, 2012, the Company sold common units of the Mississippian Trust I and the Permian Trust it owned in transactions exempt from registration under Rule 144 under the Securities Act. These transactions decreased the Company’s beneficial interests in the Royalty Trusts. See further discussion of the unit sales below.

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