Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Divestitures - Additional Information (Detail)

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Acquisitions and Divestitures - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended
Jul. 11, 2013
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Callon Properties
Mar. 31, 2013
Callon Properties
Oct. 17, 2013
Callon Properties
Sep. 26, 2013
West Delta Area Block Twenty Nine
Business Acquisition [Line Items]                
Percentage of working interest include in producing interest             15.00%  
Adjustments to purchase price         $ 200,000      
Expenses associated with acquisition activities and transition activities           0    
Revenues   254,516,000 259,222,000   8,700,000      
Lease operating expenses   55,617,000 59,341,000   900,000      
Depreciation, depletion, amortization and accretion   123,306,000 108,872,000   3,500,000      
Income tax expense   6,648,000 14,902,000   1,500,000      
Net income   11,189,000 26,618,000   2,800,000      
Long-term debt, less current maturities   1,193,847,000   1,205,421,000 82,300,000      
Effective interest rate         2.00%      
Federal statutory income tax rate   35.00%     35.00%      
Reversal of asset retirement obligation 15,600,000             3,900,000
Adjustment for effective date to sell properties 4,300,000              
Proceeds from sale of non-operating working interest               $ 16,500,000