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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, 2013 | Mar. 31, 2012
Revenues |  |
Oil and gas revenues | $ 241,651 | $ 137,906
Well services and midstream revenues | 6,653 | 660
Total revenues | 248,304 | 138,566
Expenses |  |
Lease operating expenses | 19,489 | 9,816
Well services and midstream operating expenses | 2,914 | 477
Marketing, transportation and gathering expenses | 3,389 | 2,569
Production taxes | 22,089 | 13,266
Depreciation, depletion and amortization | 66,261 | 38,886
Exploration expenses | 1,857 | 2,835
Impairment of oil and gas properties | 498 | 368
General and administrative expenses | 13,854 | 12,199
Total expenses | 130,351 | 80,416
Operating income (loss) | 117,953 | 58,150
Other income (expense) |  |
Equity in earnings in subsidiaries |  |
Net loss on derivative instruments | (14,612) | (18,586)
Interest expense, net of capitalized interest | (21,183) | (13,899)
Other income | 780 | 598
Total other income (expense) | (35,015) | (31,887)
Income before income taxes | 82,938 | 26,263
Income tax benefit (expense) | (31,087) | (9,822)
Net income | 51,851 | 16,441
Parent/Issuer [Member] |  |
Expenses |  |
General and administrative expenses | 2,876 | 2,449
Total expenses | 2,876 | 2,449
Operating income (loss) | (2,876) | (2,449)
Other income (expense) |  |
Equity in earnings in subsidiaries | 66,243 | 26,264
Interest expense, net of capitalized interest | (20,518) | (13,414)
Other income | 376 | 177
Total other income (expense) | 46,101 | 13,027
Income before income taxes | 43,225 | 10,578
Income tax benefit (expense) | 8,626 | 5,863
Net income | 51,851 | 16,441
Combined Guarantor Subsidiaries [Member] |  |
Revenues |  |
Oil and gas revenues | 241,651 | 137,906
Well services and midstream revenues | 6,653 | 660
Total revenues | 248,304 | 138,566
Expenses |  |
Lease operating expenses | 19,489 | 9,816
Well services and midstream operating expenses | 2,914 | 477
Marketing, transportation and gathering expenses | 3,389 | 2,569
Production taxes | 22,089 | 13,266
Depreciation, depletion and amortization | 66,261 | 38,886
Exploration expenses | 1,857 | 2,835
Impairment of oil and gas properties | 498 | 368
General and administrative expenses | 10,978 | 9,750
Total expenses | 127,475 | 77,967
Operating income (loss) | 120,829 | 60,599
Other income (expense) |  |
Equity in earnings in subsidiaries |  |
Net loss on derivative instruments | (14,612) | (18,586)
Interest expense, net of capitalized interest | (665) | (485)
Other income | 404 | 421
Total other income (expense) | (14,873) | (18,650)
Income before income taxes | 105,956 | 41,949
Income tax benefit (expense) | (39,713) | (15,685)
Net income | 66,243 | 26,264
Intercompany Eliminations [Member] |  |
Other income (expense) |  |
Equity in earnings in subsidiaries | (66,243) | (26,264)
Total other income (expense) | (66,243) | (26,264)
Income before income taxes | (66,243) | (26,264)
Net income | $ (66,243) | $ (26,264)

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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 Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-OGP -Paragraph 48 -IssueDate 2006-05-01 -Chapter 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 Reference 5: 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=21918352&loc=d3e511914-122862 + Details
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- Details
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- Definition Cost incurred related to well drilled or completed for the purpose of supporting production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 274 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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