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Subsequent Events - Royalty Trust Distributions (Detail) (Royalty Trust Distributions, USD $)
In Thousands, unless otherwise specified
Oct. 24, 2013
Royalty Trusts
  
Subsequent Event  
Total distribution $ 73,260
Amount to be distributed to third-party unitholders 53,468
Mississippian Trust I
  
Subsequent Event  
Total distribution 12,660
Amount to be distributed to third-party unitholders 12,342
Permian Trust
  
Subsequent Event  
Total distribution 34,223
Amount to be distributed to third-party unitholders 24,483
Mississippian Trust II
  
Subsequent Event  
Total distribution 26,377
Amount to be distributed to third-party unitholders $ 16,643