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Condensed Consolidating Financial Statements - Schedule of Condensed Consolidating Statement of Operations (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues                      
Oil and gas revenues                 $ 721,672,000 $ 1,304,004,000 $ 1,084,412,000
Well services and midstream revenues                 68,063,000 86,224,000 57,587,000
Total revenues $ 182,067,000 $ 197,235,000 $ 230,046,000 $ 180,387,000 $ 299,672,000 $ 368,659,000 $ 372,378,000 $ 349,519,000 789,735,000 1,390,228,000 1,141,999,000
Operating expenses                      
Lease operating expenses                 144,481,000 169,600,000 94,634,000
Well services and midstream operating expenses                 28,031,000 50,252,000 30,713,000
Marketing, transportation and gathering expenses                 31,610,000 29,133,000 25,924,000
Production taxes                 69,584,000 127,648,000 100,537,000
Depreciation, depletion and amortization                 485,322,000 412,334,000 307,055,000
Exploration expenses                 2,369,000 3,064,000 2,260,000
Rig termination                 3,895,000 0 0
Impairment of oil and gas properties                 46,109,000 47,238,000 1,168,000
General and administrative expenses                 92,498,000 92,306,000 75,310,000
Total operating expenses                 903,899,000 931,575,000 637,601,000
Gain on sale of properties                 0 186,999,000 0
Operating income (loss) (53,166,000) (19,926,000) (7,437,000) (33,635,000) 15,924,000 134,103,000 166,545,000 329,080,000 (114,164,000) 645,652,000 504,398,000
Other income (expense)                      
Equity in earnings of subsidiaries                 0 0 0
Net gain (loss) on derivative instruments                 210,376,000 327,011,000 (35,432,000)
Interest expense, net of capitalized interest                 (149,648,000) (158,390,000) (107,165,000)
Other income (expense)                 (2,935,000) 195,000 1,216,000
Total other income (expense)                 57,793,000 168,816,000 (141,381,000)
Income (loss) before income taxes                 (56,371,000) 814,468,000 363,017,000
Income tax benefit (expense)                 16,123,000 (307,591,000) (135,058,000)
Net income (loss) $ 3,968,000 $ 27,055,000 $ (53,230,000) $ (18,041,000) $ 176,504,000 $ 121,587,000 $ 38,833,000 $ 169,953,000 (40,248,000) 506,877,000 227,959,000
Parent/ Issuer                      
Revenues                      
Oil and gas revenues                 0 0 0
Well services and midstream revenues                 0 0 0
Total revenues                 0 0 0
Operating expenses                      
Lease operating expenses                 0 0 0
Well services and midstream operating expenses                 0 0 0
Marketing, transportation and gathering expenses                 0 0 0
Production taxes                 0 0 0
Depreciation, depletion and amortization                 0 0 0
Exploration expenses                 0 0 0
Rig termination                 0    
Impairment of oil and gas properties                 0 0 0
General and administrative expenses                 27,930,000 23,528,000 14,044,000
Total operating expenses                 27,930,000 23,528,000 14,044,000
Gain on sale of properties                   0  
Operating income (loss)                 (27,930,000) (23,528,000) (14,044,000)
Other income (expense)                      
Equity in earnings of subsidiaries                 69,986,000 613,601,000 299,459,000
Net gain (loss) on derivative instruments                 0 0 0
Interest expense, net of capitalized interest                 (138,166,000) (147,230,000) (99,663,000)
Other income (expense)                 5,000 5,000 (335,000)
Total other income (expense)                 (68,175,000) 466,376,000 199,461,000
Income (loss) before income taxes                 (96,105,000) 442,848,000 185,417,000
Income tax benefit (expense)                 55,857,000 64,029,000 42,542,000
Net income (loss)                 (40,248,000) 506,877,000 227,959,000
Combined Guarantor Subsidiaries                      
Revenues                      
Oil and gas revenues                 721,672,000 1,304,004,000 1,084,412,000
Well services and midstream revenues                 68,063,000 86,224,000 57,587,000
Total revenues                 789,735,000 1,390,228,000 1,141,999,000
Operating expenses                      
Lease operating expenses                 144,481,000 169,600,000 94,634,000
Well services and midstream operating expenses                 28,031,000 50,252,000 30,713,000
Marketing, transportation and gathering expenses                 31,610,000 29,133,000 25,924,000
Production taxes                 69,584,000 127,648,000 100,537,000
Depreciation, depletion and amortization                 485,322,000 412,334,000 307,055,000
Exploration expenses                 2,369,000 3,064,000 2,260,000
Rig termination                 3,895,000    
Impairment of oil and gas properties                 46,109,000 47,238,000 1,168,000
General and administrative expenses                 64,568,000 68,778,000 61,266,000
Total operating expenses                 875,969,000 908,047,000 623,557,000
Gain on sale of properties                   186,999,000  
Operating income (loss)                 (86,234,000) 669,180,000 518,442,000
Other income (expense)                      
Equity in earnings of subsidiaries                 0 0 0
Net gain (loss) on derivative instruments                 210,376,000 327,011,000 (35,432,000)
Interest expense, net of capitalized interest                 (11,482,000) (11,160,000) (7,502,000)
Other income (expense)                 (2,940,000) 190,000 1,551,000
Total other income (expense)                 195,954,000 316,041,000 (41,383,000)
Income (loss) before income taxes                 109,720,000 985,221,000 477,059,000
Income tax benefit (expense)                 (39,734,000) (371,620,000) (177,600,000)
Net income (loss)                 69,986,000 613,601,000 299,459,000
Intercompany Eliminations                      
Revenues                      
Oil and gas revenues                 0 0 0
Well services and midstream revenues                 0 0 0
Total revenues                 0 0 0
Operating expenses                      
Lease operating expenses                 0 0 0
Well services and midstream operating expenses                 0 0 0
Marketing, transportation and gathering expenses                 0 0 0
Production taxes                 0 0 0
Depreciation, depletion and amortization                 0 0 0
Exploration expenses                 0 0 0
Rig termination                 0    
Impairment of oil and gas properties                 0 0 0
General and administrative expenses                 0 0 0
Total operating expenses                 0 0 0
Gain on sale of properties                   0  
Operating income (loss)                 0 0 0
Other income (expense)                      
Equity in earnings of subsidiaries                 (69,986,000) (613,601,000) (299,459,000)
Net gain (loss) on derivative instruments                 0 0 0
Interest expense, net of capitalized interest                 0 0 0
Other income (expense)                 0 0 0
Total other income (expense)                 (69,986,000) (613,601,000) (299,459,000)
Income (loss) before income taxes                 (69,986,000) (613,601,000) (299,459,000)
Income tax benefit (expense)                 0 0 0
Net income (loss)                 $ (69,986,000) $ (613,601,000) $ (299,459,000)