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Subsequent Events - Royalty Trust Distributions (Details) (Royalty Trust Distributions, USD $)
In Thousands, unless otherwise specified
Apr. 25, 2013
Royalty Trusts
  
Subsequent Event [Line Items]  
Total distribution $ 68,457
Amount to be distributed to third-party unitholders 47,468
Mississippian Trust I
  
Subsequent Event [Line Items]  
Total distribution 15,909
Amount to be distributed to third-party unitholders 12,087
Permian Trust
  
Subsequent Event [Line Items]  
Total distribution 24,787
Amount to be distributed to third-party unitholders 18,688
Mississippian Trust II
  
Subsequent Event [Line Items]  
Total distribution 27,761
Amount to be distributed to third-party unitholders $ 16,693