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Condensed Consolidating Financial Statements - Schedule of Condensed Consolidating Statement of Operations (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
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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)

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