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Consolidating Financial Statements - Schedule of Consolidating Statement of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues                      
Oil and gas revenues                 $ 670,491 $ 330,422 $ 128,927
Well services revenues                 16,177    
Total revenues 214,327 184,710 149,063 138,566 116,876 87,596 67,206 58,744 686,668 330,422 128,927
Expenses                      
Lease operating expenses                 54,924 32,707 14,118
Well services operating expense                 11,774    
Marketing, transportation and gathering expenses                 9,257 1,365 464
Production taxes                 62,965 33,865 13,768
Depreciation, depletion and amortization                 206,734 74,981 37,832
Exploration expenses                 3,250 1,685 297
Impairment of oil and gas properties                 3,581 3,610 11,967
Loss on sale of properties                   207  
Stock-based compensation expenses                     8,743
General and administrative expenses                 57,190 29,435 19,745
Total expenses                 409,675 177,855 106,934
Operating income (loss) 86,619 72,038 60,184 58,152 54,336 40,273 32,414 25,544 276,993 152,567 21,993
Other income (expense)                      
Net gain (loss) on derivative instruments                 34,164 1,595 (7,653)
Interest expense                 (70,143) (29,618) (1,357)
Other income (expense)                 4,860 1,635 284
Total other income (expense)                 (31,119) (26,388) (8,726)
Income (loss) before income taxes                 245,874 126,179 13,267
Income tax benefit (expense)                 (92,486) (46,789) (42,962)
Net income (loss) 42,591 18,314 76,041 16,442 (13,401) 66,289 33,349 (6,847) 153,388 79,390 (29,695)
Parent/Issuer [Member]
                      
Expenses                      
Depreciation, depletion and amortization                         
Impairment of oil and gas properties                         
Loss on sale of properties                       
General and administrative expenses                 12,591 5,505 2,780
Total expenses                 12,591 5,505 2,780
Operating income (loss)                 (12,591) (5,505) (2,780)
Other income (expense)                      
Equity in earnings of subsidiaries                 202,924 99,836 (28,124)
Net gain (loss) on derivative instruments                         
Interest expense                 (67,651) (28,310)  
Other income (expense)                 1,118 1,165 255
Total other income (expense)                 136,391 72,691 (27,869)
Income (loss) before income taxes                 123,800 67,186 (30,649)
Income tax benefit (expense)                 29,588 12,204 954
Net income (loss)                 153,388 79,390 (29,695)
Combined Guarantor Subsidiaries [Member]
                      
Revenues                      
Oil and gas revenues                 670,491 330,422 128,927
Well services revenues                 16,177    
Total revenues                 686,668    
Expenses                      
Lease operating expenses                 54,924 32,707 14,118
Well services operating expense                 11,774    
Marketing, transportation and gathering expenses                 9,257 1,365 464
Production taxes                 62,965 33,865 13,768
Depreciation, depletion and amortization                 206,734 74,981 37,832
Exploration expenses                 3,250 1,685 297
Impairment of oil and gas properties                 3,581 3,610 11,967
Loss on sale of properties                   207  
Stock-based compensation expenses                     8,743
General and administrative expenses                 44,599 23,930 16,965
Total expenses                 397,084 172,350 104,154
Operating income (loss)                 289,584 158,072 24,773
Other income (expense)                      
Equity in earnings of subsidiaries                         
Net gain (loss) on derivative instruments                 34,164 1,595 (7,653)
Interest expense                 (2,492) (1,308) (1,357)
Other income (expense)                 3,742 470 29
Total other income (expense)                 35,414 757 (8,981)
Income (loss) before income taxes                 324,998 158,829 15,792
Income tax benefit (expense)                 (122,074) (58,993) (43,916)
Net income (loss)                 202,924 99,836 (28,124)
Intercompany Eliminations [Member]
                      
Expenses                      
Depreciation, depletion and amortization                         
Impairment of oil and gas properties                         
Loss on sale of properties                       
Other income (expense)                      
Equity in earnings of subsidiaries                 (202,924) (99,836) 28,124
Net gain (loss) on derivative instruments                         
Total other income (expense)                 (202,924) (99,836) 28,124
Income (loss) before income taxes                 (202,924) (99,836) 28,124
Net income (loss)                 $ (202,924) $ (99,836) $ 28,124