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Variable Interest Entities - Royalty Trusts - Common and Subordinated Units Outstanding (Details) - shares
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Mississippian Trust I    
Variable Interest Entity    
Total outstanding common units (in shares) [1] 28,000,000 28,000,000
Total outstanding subordinated units (in shares) [2] 0 0
Permian Trust    
Variable Interest Entity    
Total outstanding common units (in shares) [1] 39,375,000 39,375,000
Total outstanding subordinated units (in shares) [2] 13,125,000 13,125,000
Mississippian Trust II    
Variable Interest Entity    
Total outstanding common units (in shares) [1] 37,293,750 37,293,750
Total outstanding subordinated units (in shares) [2] 12,431,250 12,431,250
[1] The Mississippian Trust I’s previously outstanding subordinated units, all of which were held by SandRidge, converted to common units in the third quarter of 2014.
[2] All outstanding subordinated units are owned by SandRidge.