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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 0 Months Ended
Sep. 30, 2013
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP
Sep. 30, 2013
General Land Office of the State of Texas
Sep. 30, 2013
Patriot Exploration, LLC, Jonathan Feldman, Redwing Drilling Partners, Mapleleaf Drilling Partners, Avalanche Drilling Partners, Penguin Drilling Partners and Gramax Insurance Company Ltd.
Sep. 30, 2013
Treating Agreement
bcf
Sep. 30, 2013
Treating Agreement
Minimum
Sep. 30, 2013
Treating Agreement
Maximum
Aug. 28, 2013
Kallick action
Oct. 30, 2013
Kallick action
Subsequent Event
Commitments and Contingencies Disclosure                
Damages sought by plaintiff $ 45.5 $ 13.0         $ 5.0  
Plaintiffs investment under participation agreement     16.0          
Litigation settlement, amount               2.5
Contract agreement, term       30 years        
Minimum delivery required (in Bcf)       3,200        
Estimated minimum delivery required remaining, long-term       3,000        
Initial shortfall price per Mcf       0.25        
Shortfall price per Mcf, final year of agreement       0.70        
Range of projected shortfall in one year         $ 29.5 $ 36.0