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Variable Interest Entities - Royalty Trusts - Outstanding Units (Details)
 1 Months Ended
Apr. 30, 2011
Mississippian Trust I
Aug. 31, 2011
Permian Trust
Apr. 30, 2012
Mississippian Trust II
Variable Interest Entity      
Total outstanding common units (in shares) 21,000,000 39,375,000 37,293,750
Total outstanding subordinated units (in shares) 7,000,000 13,125,000 12,431,250
Liquidation date(1) Dec. 31, 2030 [1] Mar. 31, 2031 [1] Dec. 31, 2031 [1]
[1] At the time each Royalty Trust terminates, 50% of the royalty interests conveyed to the Royalty Trust will automatically revert to the Company, and the remaining 50% will be sold with the proceeds distributed to the Royalty Trust unitholders.