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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Income Loss from Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Mcfe
MMcf
MBbls
Jun. 30, 2012
MMcf
Mcfe
MBbls
Jun. 30, 2013
MMcf
Mcfe
MBbls
Jun. 30, 2012
Mcfe
MBbls
MMcf
Revenues:        
Oil and gas sales $ 8,826 $ 10,407 $ 25,125 $ 18,324
Costs and expenses:        
Production taxes 427 519 1,120 909
Gathering and transportation 170 232 501 409
Lease operating 3,545 1,755 9,853 3,046
Depletion, depreciation and amortization   4,408 8,649 6,194
Interest expense 2,847 [1] 1,178 [1] 6,346 [1] 2,112 [1]
Total costs and expenses 6,989 8,092 26,469 12,670
Gain on sale of discontinued operations 230,637   230,637  
Income from discontinued operations before income taxes 232,474 2,315 229,293 5,654
Income tax expense:        
Current (637)   (637)  
Deferred (80,601) (11,860) (80,047) (15,241)
Total income tax expense (81,238) (11,860) (80,684) (15,241)
Net income (loss) from discontinued operations $ 151,236 $ (9,545) $ 148,609 $ (9,587)
Net Production Data:        
Oil (Mbbls) 96 124 270 197
Natural Gas (Mmcf) 141 145 410 272
Natural Gas Equivalent (Mmcfe) 720,000 885,000 2,031,000 1,451,000
[1] Interest expense was allocated to discontinued operations based on the ratio of the net assets of discontinued operations to our consolidated net assets plus long-term debt. Interest expense is net of capitalized interest of $- and $2,253 for the three months ended June 30, 2013 and 2012, respectively, and $2,010 and $4,393 for the six months ended June 30, 2013 and 2012, respectively.