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Variable Interest Entities - Royalty Trusts - Open Oil and Natural Gas Commodity Derivative Contracts (Details)
 3 Months Ended
Sep. 30, 2013
MBbls
Oil Price Swaps | October 2013 - December 2013
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 3,494
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 99.48
Oil Price Swaps | January 2014 - December 2014
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 8,813
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 92.98
Oil Price Swaps | January 2015 - December 2015
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 6,614
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 85.25
Natural Gas Collars | October 2013 - December 2013
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 1,716
Collar Range, minimum 3.78
Collar Range, maximum 6.71
Natural Gas Collars | January 2014 - December 2014
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 937
Collar Range, minimum 4.00
Collar Range, maximum 7.78
Natural Gas Collars | January 2015 - December 2015
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 1,010
Collar Range, minimum 4.00
Collar Range, maximum 8.55
Royalty Trusts | Oil Price Swaps | October 2013 - December 2013
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 413
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 103.04
Royalty Trusts | Oil Price Swaps | January 2014 - December 2014
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 1,862
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 100.70
Royalty Trusts | Oil Price Swaps | January 2015 - December 2015
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 630
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 101.03
Royalty Trusts | Oil Price Swaps | Novated Contract | October 2013 - December 2013
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 302
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 103.27
Royalty Trusts | Oil Price Swaps | Novated Contract | January 2014 - December 2014
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 991
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 100.79
Royalty Trusts | Oil Price Swaps | Novated Contract | January 2015 - March 2015
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 141
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 100.90
Royalty Trusts | Natural Gas Collars | October 2013 - December 2013
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 216
Collar Range, minimum 4.00
Collar Range, maximum 7.15
Royalty Trusts | Natural Gas Collars | January 2014 - December 2014
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 937
Collar Range, minimum 4.00
Collar Range, maximum 7.78
Royalty Trusts | Natural Gas Collars | January 2015 - December 2015
  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 1,010
Collar Range, minimum 4.00
Collar Range, maximum 8.55