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Subsequent Events - Royalty Trust Distributions (Detail) (Royalty Trust Distributions, USD $)
In Thousands, unless otherwise specified
Jul. 25, 2013
Royalty Trusts
  
Subsequent Event  
Total distribution $ 81,579
Amount to be distributed to third-party unitholders 54,287
Mississippian Trust I
  
Subsequent Event  
Total distribution 16,920
Amount to be distributed to third-party unitholders 12,512
Permian Trust
  
Subsequent Event  
Total distribution 30,707
Amount to be distributed to third-party unitholders 21,353
Mississippian Trust II
  
Subsequent Event  
Total distribution 33,952
Amount to be distributed to third-party unitholders $ 20,422