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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenues    
Oil and gas revenues $ 331,847 $ 241,651
Well services and midstream revenues 17,672 6,653
Total revenues 349,519 248,304
Expenses    
Lease operating expenses 39,989 19,489
Well services and midstream operating expenses 10,920 2,914
Marketing, transportation and gathering expenses 5,186 3,389
Production taxes 31,803 22,089
Depreciation, depletion and amortization 91,272 66,261
Exploration expenses 380 1,857
Impairment of oil and gas properties 762 498
General and administrative expenses 23,520 13,854
Total expenses 203,832 130,351
Gain on sale of properties 183,393 0
Operating income (loss) 329,080 117,953
Other income (expense)    
Net loss on derivative instruments (17,603) (14,612)
Interest expense, net of capitalized interest (40,158) (21,183)
Other income (expense) 153 780
Total other income (expense) (57,608) (35,015)
Income before income taxes 271,472 82,938
Income tax benefit (expense) (101,519) (31,087)
Net income 169,953 51,851
Parent/Issuer [Member]
    
Expenses    
General and administrative expenses 5,612 2,876
Total expenses 5,612 2,876
Operating income (loss) (5,612) (2,876)
Other income (expense)    
Equity in earnings in subsidiaries 196,933 66,243
Interest expense, net of capitalized interest (37,424) (20,518)
Other income (expense) 3 376
Total other income (expense) 159,512 46,101
Income before income taxes 153,900 43,225
Income tax benefit (expense) 16,053 8,626
Net income 169,953 51,851
Combined Guarantor Subsidiaries [Member]
    
Revenues    
Oil and gas revenues 331,847 241,651
Well services and midstream revenues 17,672 6,653
Total revenues 349,519 248,304
Expenses    
Lease operating expenses 39,989 19,489
Well services and midstream operating expenses 10,920 2,914
Marketing, transportation and gathering expenses 5,186 3,389
Production taxes 31,803 22,089
Depreciation, depletion and amortization 91,272 66,261
Exploration expenses 380 1,857
Impairment of oil and gas properties 762 498
General and administrative expenses 17,908 10,978
Total expenses 198,220 127,475
Gain on sale of properties 183,393  
Operating income (loss) 334,692 120,829
Other income (expense)    
Net loss on derivative instruments (17,603) (14,612)
Interest expense, net of capitalized interest (2,734) (665)
Other income (expense) 150 404
Total other income (expense) (20,187) (14,873)
Income before income taxes 314,505 105,956
Income tax benefit (expense) (117,572) (39,713)
Net income 196,933 66,243
Intercompany Eliminations [Member]
    
Other income (expense)    
Equity in earnings in subsidiaries (196,933) (66,243)
Total other income (expense) (196,933) (66,243)
Income before income taxes (196,933) (66,243)
Net income $ (196,933) $ (66,243)