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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2010
Legal Reserve
Mar. 31, 2014
Contract Drilling
Mar. 31, 2014
Maximum
Contract Drilling
Mar. 31, 2014
Maximum
Firm Transportation [Member]
Mar. 31, 2014
Minimum [Member]
Firm Transportation [Member]
Mar. 31, 2014
Gas Gathering And Compression Services [Member]
Commitments and Contingencies Disclosure [Line Items]              
Contract term       14 months 15 years 1 year  
Contract termination claims description     early termination provisions that would require us to pay penalties if we terminate the agreements prior to the end of their original terms.        
Loss on contract termination for default     $ 17.3        
Contractual Obligation, Due in Next Twelve Months             3.7
Contractual Obligation, Due in Second Year             4.2
Contractual Obligation, Due in Third Year             5.0
Reserve established for contingency matters   0.9          
Suspense account 1.8            
Asset retirement obligations $ 6.5