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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Revenues |  |  |  |
Oil and gas revenues | $ 145,203 | $ 67,206 | $ 283,109 | $ 125,950
Well services revenues | 3,861 |  | 4,521 |
Total revenues | 149,064 | 67,206 | 287,630 | 125,950
Oil and gas revenues | 145,203 | 67,206 | 283,109 | 125,950
Expenses |  |  |  |
Lease operating expenses | 12,029 | 5,951 | 21,845 | 11,581
Well services operating expenses | 1,207 |  | 1,684 |
Marketing, transportation and gathering expenses | 1,970 | 247 | 4,539 | 559
Production taxes | 13,720 | 7,085 | 26,986 | 13,168
Depreciation, depletion and amortization | 44,213 | 13,100 | 83,099 | 26,912
Exploration expenses |  | 259 | 2,835 | 291
Impairment of oil and gas properties | 2,203 | 1,536 | 2,571 | 2,917
General and administrative expenses | 13,537 | 6,614 | 25,736 | 12,564
Total expenses | 88,879 | 34,792 | 169,295 | 67,992
Operating income | 60,185 | 32,414 | 118,335 | 57,958
Other income (expense) |  |  |  |
Net gain (loss)on derivative instruments | 74,595 | 27,547 | 56,009 | (4,119)
Interest expense | (14,074) | (6,761) | (27,973) | (11,959)
Other income | 776 | 379 | 1,374 | 691
Total other income (expense) | 61,297 | 21,165 | 29,410 | (15,387)
Income before income taxes | 121,482 | 53,579 | 147,745 | 42,571
Income tax benefit (expense) | (45,439) | (20,230) | (55,261) | (16,069)
Net income | 76,043 | 33,349 | 92,484 | 26,502
Parent/Issuer [Member] |  |  |  |
Expenses |  |  |  |
General and administrative expenses | 2,644 | 1,318 | 5,090 | 2,581
Total expenses | 2,644 | 1,318 | 5,090 | 2,581
Operating income | (2,644) | (1,318) | (5,090) | (2,581)
Other income (expense) |  |  |  |
Equity in earnings in subsidiaries | 86,024 | 37,557 | 112,286 | 34,387
Interest expense | (13,414) | (6,473) | (26,829) | (11,414)
Other income | 118 | 371 | 295 | 664
Total other income (expense) | 72,728 | 31,455 | 85,752 | 23,637
Income before income taxes | 70,084 | 30,137 | 80,662 | 21,056
Income tax benefit (expense) | 5,959 | 3,212 | 11,822 | 5,446
Net income | 76,043 | 33,349 | 92,484 | 26,502
Combined Guarantor Subsidiaries [Member] |  |  |  |
Revenues |  |  |  |
Oil and gas revenues | 145,203 | 67,206 | 283,109 | 125,950
Well services revenues | 3,861 |  | 4,521 |
Total revenues | 149,064 |  | 287,630 |
Oil and gas revenues | 145,203 | 67,206 | 283,109 | 125,950
Expenses |  |  |  |
Lease operating expenses | 12,029 | 5,951 | 21,845 | 11,581
Well services operating expenses | 1,207 |  | 1,684 |
Marketing, transportation and gathering expenses | 1,970 | 247 | 4,539 | 559
Production taxes | 13,720 | 7,085 | 26,986 | 13,168
Depreciation, depletion and amortization | 44,213 | 13,100 | 83,099 | 26,912
Exploration expenses |  | 259 | 2,835 | 291
Impairment of oil and gas properties | 2,203 | 1,536 | 2,571 | 2,917
General and administrative expenses | 10,893 | 5,296 | 20,646 | 9,983
Total expenses | 86,235 | 33,474 | 164,205 | 65,411
Operating income | 62,829 | 33,732 | 123,425 | 60,539
Other income (expense) |  |  |  |
Net gain (loss)on derivative instruments | 74,595 | 27,547 | 56,009 | (4,119)
Interest expense | (660) | (288) | (1,144) | (545)
Other income | 658 | 8 | 1,079 | 27
Total other income (expense) | 74,593 | 27,267 | 55,944 | (4,637)
Income before income taxes | 137,422 | 60,999 | 179,369 | 55,902
Income tax benefit (expense) | (51,398) | (23,442) | (67,083) | (21,515)
Net income | 86,024 | 37,557 | 112,286 | 34,387
Intercompany Eliminations [Member] |  |  |  |
Other income (expense) |  |  |  |
Equity in earnings in subsidiaries | (86,024) | (37,557) | (112,286) | (34,387)
Total other income (expense) | (86,024) | (37,557) | (112,286) | (34,387)
Income before income taxes | (86,024) | (37,557) | (112,286) | (34,387)
Net income | $ (86,024) | $ (37,557) | $ (112,286) | $ (34,387)

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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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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition A tax assessed on oil and gas production. + References No definition available. + Details
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- Definition Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period. + 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 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + 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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