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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, 2014 | Mar. 31, 2013
Revenues |  |
Oil and gas revenues | $ 331,847 | $ 241,651
Well services and midstream revenues | 17,672 | 6,653
Total revenues | 349,519 | 248,304
Expenses |  |
Lease operating expenses | 39,989 | 19,489
Well services and midstream operating expenses | 10,920 | 2,914
Marketing, transportation and gathering expenses | 5,186 | 3,389
Production taxes | 31,803 | 22,089
Depreciation, depletion and amortization | 91,272 | 66,261
Exploration expenses | 380 | 1,857
Impairment of oil and gas properties | 762 | 498
General and administrative expenses | 23,520 | 13,854
Total expenses | 203,832 | 130,351
Gain on sale of properties | 183,393 | 0
Operating income (loss) | 329,080 | 117,953
Other income (expense) |  |
Net loss on derivative instruments | (17,603) | (14,612)
Interest expense, net of capitalized interest | (40,158) | (21,183)
Other income (expense) | 153 | 780
Total other income (expense) | (57,608) | (35,015)
Income before income taxes | 271,472 | 82,938
Income tax benefit (expense) | (101,519) | (31,087)
Net income | 169,953 | 51,851
Parent/Issuer [Member] |  |
Expenses |  |
General and administrative expenses | 5,612 | 2,876
Total expenses | 5,612 | 2,876
Operating income (loss) | (5,612) | (2,876)
Other income (expense) |  |
Equity in earnings in subsidiaries | 196,933 | 66,243
Interest expense, net of capitalized interest | (37,424) | (20,518)
Other income (expense) | 3 | 376
Total other income (expense) | 159,512 | 46,101
Income before income taxes | 153,900 | 43,225
Income tax benefit (expense) | 16,053 | 8,626
Net income | 169,953 | 51,851
Combined Guarantor Subsidiaries [Member] |  |
Revenues |  |
Oil and gas revenues | 331,847 | 241,651
Well services and midstream revenues | 17,672 | 6,653
Total revenues | 349,519 | 248,304
Expenses |  |
Lease operating expenses | 39,989 | 19,489
Well services and midstream operating expenses | 10,920 | 2,914
Marketing, transportation and gathering expenses | 5,186 | 3,389
Production taxes | 31,803 | 22,089
Depreciation, depletion and amortization | 91,272 | 66,261
Exploration expenses | 380 | 1,857
Impairment of oil and gas properties | 762 | 498
General and administrative expenses | 17,908 | 10,978
Total expenses | 198,220 | 127,475
Gain on sale of properties | 183,393 |
Operating income (loss) | 334,692 | 120,829
Other income (expense) |  |
Net loss on derivative instruments | (17,603) | (14,612)
Interest expense, net of capitalized interest | (2,734) | (665)
Other income (expense) | 150 | 404
Total other income (expense) | (20,187) | (14,873)
Income before income taxes | 314,505 | 105,956
Income tax benefit (expense) | (117,572) | (39,713)
Net income | 196,933 | 66,243
Intercompany Eliminations [Member] |  |
Other income (expense) |  |
Equity in earnings in subsidiaries | (196,933) | (66,243)
Total other income (expense) | (196,933) | (66,243)
Income before income taxes | (196,933) | (66,243)
Net income | $ (196,933) | $ (66,243)

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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64954-109465 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(15)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 + Details
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