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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues                      
Oil and gas revenues                 $ 1,084,412 $ 670,491 $ 330,422
Well services and midstream revenues                 57,587 16,177 0
Total revenues 333,615 305,498 254,582 248,304 214,327 184,710 149,063 138,566 1,141,999 686,668 330,422
Expenses                      
Lease operating expenses                 94,634 54,924 32,707
Well services operating expense                 30,713 11,774 0
Marketing, transportation and gathering expenses                 25,924 9,257 1,365
Production taxes                 100,537 62,965 33,865
Depreciation, depletion and amortization                 307,055 206,734 74,981
Exploration expenses                 2,260 3,250 1,685
Impairment of oil and gas properties                 1,168 3,581 3,610
Loss on sale of properties                 0 0 207
General and administrative expenses                 75,310 57,190 29,435
Total expenses                 637,601 409,675 177,855
Operating income 122,133 150,862 113,450 117,953 86,619 72,038 60,184 58,152 504,398 276,993 152,567
Other income (expense)                      
Net gain (loss) on derivative instruments                 (35,432) 34,164 1,595
Interest expense, net of capitalized interest                 (107,165) (70,143) (29,618)
Other income (expense)                 1,216 4,860 1,635
Total other income (expense)                 (141,381) (31,119) (26,388)
Income (loss) before income taxes                 363,017 245,874 126,179
Income tax benefit (expense)                 (135,058) (92,486) (46,789)
Net income 54,490 54,499 67,119 51,851 42,591 18,314 76,041 16,442 227,959 153,388 79,390
Parent/Issuer [Member]
                      
Expenses                      
General and administrative expenses                 14,044 12,591 5,505
Total expenses                 14,044 12,591 5,505
Operating income                 (14,044) (12,591) (5,505)
Other income (expense)                      
Equity in earnings of subsidiaries                 299,459 202,924 99,836
Net gain (loss) on derivative instruments                     0
Interest expense, net of capitalized interest                 (99,663) (67,651) (28,310)
Other income (expense)                 (335) 1,118 1,165
Total other income (expense)                 199,461 136,391 72,691
Income (loss) before income taxes                 185,417 123,800 67,186
Income tax benefit (expense)                 42,542 29,588 12,204
Net income                 227,959 153,388 79,390
Combined Guarantor Subsidiaries [Member]
                      
Revenues                      
Oil and gas revenues                 1,084,412 670,491 330,422
Well services and midstream revenues                 57,587 16,177  
Total revenues                 1,141,999 686,668  
Expenses                      
Lease operating expenses                 94,634 54,924 32,707
Well services operating expense                 30,713 11,774  
Marketing, transportation and gathering expenses                 25,924 9,257 1,365
Production taxes                 100,537 62,965 33,865
Depreciation, depletion and amortization                 307,055 206,734 74,981
Exploration expenses                 2,260 3,250 1,685
Impairment of oil and gas properties                 1,168 3,581 3,610
Loss on sale of properties                     207
General and administrative expenses                 61,266 44,599 23,930
Total expenses                 623,557 397,084 172,350
Operating income                 518,442 289,584 158,072
Other income (expense)                      
Net gain (loss) on derivative instruments                 (35,432) 34,164 1,595
Interest expense, net of capitalized interest                 (7,502) (2,492) (1,308)
Other income (expense)                 1,551 3,742 470
Total other income (expense)                 (41,383) 35,414 757
Income (loss) before income taxes                 477,059 324,998 158,829
Income tax benefit (expense)                 (177,600) (122,074) (58,993)
Net income                 299,459 202,924 99,836
Intercompany Eliminations [Member]
                      
Other income (expense)                      
Equity in earnings of subsidiaries                 (299,459) (202,924) (99,836)
Total other income (expense)                 (299,459) (202,924) (99,836)
Income (loss) before income taxes                 (299,459) (202,924) (99,836)
Net income                 $ (299,459) $ (202,924) $ (99,836)