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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
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.