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Variable Interest Entities - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Grey Ranch Plant, L.P | Dec. 31, 2012 Grey Ranch Plant, L.P | Mar. 31, 2013 Grey Ranch Plant Genpar, LLC ("Genpar") | Apr. 30, 2011 Mississippian Trust I | Mar. 31, 2013 Mississippian Trust I | Dec. 31, 2012 Mississippian Trust I | Apr. 30, 2011 Permian Trust | Mar. 31, 2013 Permian Trust | Dec. 31, 2012 Permian Trust | Aug. 31, 2011 Permian Trust | Apr. 30, 2012 Mississippian Trust II | Mar. 31, 2013 Mississippian Trust II | Dec. 31, 2012 Mississippian Trust II | Mar. 31, 2013 Royalty Trusts | Mar. 31, 2012 Royalty Trusts | Dec. 31, 2012 Royalty Trusts | Mar. 31, 2013 Gas Gathering Agreement Pinon Gathering Company LLC
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial interest owned by Company |  |  | 50.00% |  | 50.00% | 38.40% | [1] | 26.90% | 26.90% |  | 30.50% | 30.50% | 34.30% | [1] | 39.90% | [1] | 39.90% | 39.90% |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, limited partnerships |  |  | $ 600,000 | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership of another VIE |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  | 982,000 | 274,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,004,000 |  | 1,101,000 |
Royalty Trust IPO date, year and month |  |  |  |  |  | April 2011 |  |  |  | August 2011 |  |  |  |  | April 2012 |  |  |  |  |  |  |
Percentage of subordinated units to total units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Royalty Trust subordinated units distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The subordinated units are entitled to receive pro rata distributions from the Royalty Trusts each quarter if and to the extent there is sufficient cash to provide a cash distribution on the common units that is no less than the applicable quarterly subordination threshold. If there is not sufficient cash to fund such a distribution on all common units, the distribution to be made with respect to the subordinated units will be reduced or eliminated for such quarter in order to make a distribution, to the extent possible, of up to the subordination threshold amount on all common units, including common units held by the Company. |  |  |
Percentage of cash available in excess of target distribution paid for incentive distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Royalty Trust incentive distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | In exchange for agreeing to subordinate a portion of its Royalty Trust units, SandRidge is entitled to receive incentive distributions equal to 50% of the amount by which the cash available for distribution on all of the Royalty Trust units exceeds the applicable quarterly incentive threshold. |  |  |
Outstanding balance under loan commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |
Development period deadline under development agreement |  |  |  |  |  |  |  | Dec. 31, 2015 |  |  | Mar. 31, 2016 |  |  |  |  |  | Dec. 31, 2016 |  |  |  |  |
Maximum amount recoverable by trusts under the lien |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 310,400,000 |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000,000 |  | 1,500,000,000 |
Proceeds from the sale of royalty trust units | $ 0 | $ 98,849,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,849,000 |  |
Gas gathering and operations and maintenance agreement end date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2029
[1] | Subsequent to the initial public offerings, 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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