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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, 2013
Mar. 31, 2012
Revenues    
Oil and gas revenues $ 241,651 $ 137,906
Well services and midstream revenues 6,653 660
Total revenues 248,304 138,566
Expenses    
Lease operating expenses 19,489 9,816
Well services and midstream operating expenses 2,914 477
Marketing, transportation and gathering expenses 3,389 2,569
Production taxes 22,089 13,266
Depreciation, depletion and amortization 66,261 38,886
Exploration expenses 1,857 2,835
Impairment of oil and gas properties 498 368
General and administrative expenses 13,854 12,199
Total expenses 130,351 80,416
Operating income (loss) 117,953 58,150
Other income (expense)    
Equity in earnings in subsidiaries      
Net loss on derivative instruments (14,612) (18,586)
Interest expense, net of capitalized interest (21,183) (13,899)
Other income 780 598
Total other income (expense) (35,015) (31,887)
Income before income taxes 82,938 26,263
Income tax benefit (expense) (31,087) (9,822)
Net income 51,851 16,441
Parent/Issuer [Member]
    
Expenses    
General and administrative expenses 2,876 2,449
Total expenses 2,876 2,449
Operating income (loss) (2,876) (2,449)
Other income (expense)    
Equity in earnings in subsidiaries 66,243 26,264
Interest expense, net of capitalized interest (20,518) (13,414)
Other income 376 177
Total other income (expense) 46,101 13,027
Income before income taxes 43,225 10,578
Income tax benefit (expense) 8,626 5,863
Net income 51,851 16,441
Combined Guarantor Subsidiaries [Member]
    
Revenues    
Oil and gas revenues 241,651 137,906
Well services and midstream revenues 6,653 660
Total revenues 248,304 138,566
Expenses    
Lease operating expenses 19,489 9,816
Well services and midstream operating expenses 2,914 477
Marketing, transportation and gathering expenses 3,389 2,569
Production taxes 22,089 13,266
Depreciation, depletion and amortization 66,261 38,886
Exploration expenses 1,857 2,835
Impairment of oil and gas properties 498 368
General and administrative expenses 10,978 9,750
Total expenses 127,475 77,967
Operating income (loss) 120,829 60,599
Other income (expense)    
Equity in earnings in subsidiaries      
Net loss on derivative instruments (14,612) (18,586)
Interest expense, net of capitalized interest (665) (485)
Other income 404 421
Total other income (expense) (14,873) (18,650)
Income before income taxes 105,956 41,949
Income tax benefit (expense) (39,713) (15,685)
Net income 66,243 26,264
Intercompany Eliminations [Member]
    
Other income (expense)    
Equity in earnings in subsidiaries (66,243) (26,264)
Total other income (expense) (66,243) (26,264)
Income before income taxes (66,243) (26,264)
Net income $ (66,243) $ (26,264)