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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Revenues |  |  |  |
Oil and gas revenues | $ 178,748 | $ 87,596 | $ 461,857 | $ 213,546
Well services revenues | 5,963 |  | 10,484 |
Total revenues | 184,711 | 87,596 | 472,341 | 213,546
Expenses |  |  |  |
Lease operating expenses | 16,134 | 9,597 | 37,979 | 21,178
Well services operating expenses | 5,420 |  | 7,104 |
Marketing, transportation and gathering expenses | 2,744 | 238 | 7,283 | 797
Production taxes | 16,433 | 8,873 | 43,419 | 22,041
Depreciation, depletion and amortization | 57,684 | 20,859 | 140,783 | 47,771
Exploration expenses | 336 | 54 | 3,171 | 345
Impairment of oil and gas properties | 36 | 396 | 2,607 | 3,313
General and administrative expenses | 13,886 | 7,306 | 39,622 | 19,870
Total expenses | 112,673 | 47,323 | 281,968 | 115,315
Operating income (loss) | 72,038 | 40,273 | 190,373 | 98,231
Other income (expense) |  |  |  |
Net gain (loss) on derivative instruments | (22,441) | 71,224 | 33,568 | 67,105
Interest expense | (20,979) | (6,786) | (48,952) | (18,745)
Other income | 1,147 | 524 | 2,521 | 1,215
Total other income (expense) | (42,273) | 64,962 | (12,863) | 49,575
Income before income taxes | 29,765 | 105,235 | 177,510 | 147,806
Income tax benefit (expense) | (11,451) | (38,946) | (66,712) | (55,015)
Net income | 18,314 | 66,289 | 110,798 | 92,791
Parent/Issuer [Member] |  |  |  |
Expenses |  |  |  |
General and administrative expenses | 2,988 | 1,282 | 8,078 | 3,863
Total expenses | 2,988 | 1,282 | 8,078 | 3,863
Operating income (loss) | (2,988) | (1,282) | (8,078) | (3,863)
Other income (expense) |  |  |  |
Equity in earnings in subsidiaries | 32,735 | 71,445 | 145,021 | 105,832
Interest expense | (20,307) | (6,495) | (47,136) | (17,909)
Other income | 238 | 282 | 533 | 946
Total other income (expense) | 12,666 | 65,232 | 98,418 | 88,869
Income before income taxes | 9,678 | 63,950 | 90,340 | 85,006
Income tax benefit (expense) | 8,636 | 2,339 | 20,458 | 7,785
Net income | 18,314 | 66,289 | 110,798 | 92,791
Combined Guarantor Subsidiaries [Member] |  |  |  |
Revenues |  |  |  |
Oil and gas revenues | 178,748 | 87,596 | 461,857 | 213,546
Well services revenues | 5,963 |  | 10,484 |
Total revenues | 184,711 |  | 472,341 |
Expenses |  |  |  |
Lease operating expenses | 16,134 | 9,597 | 37,979 | 21,178
Well services operating expenses | 5,420 |  | 7,104 |
Marketing, transportation and gathering expenses | 2,744 | 238 | 7,283 | 797
Production taxes | 16,433 | 8,873 | 43,419 | 22,041
Depreciation, depletion and amortization | 57,684 | 20,859 | 140,783 | 47,771
Exploration expenses | 336 | 54 | 3,171 | 345
Impairment of oil and gas properties | 36 | 396 | 2,607 | 3,313
General and administrative expenses | 10,898 | 6,024 | 31,544 | 16,007
Total expenses | 109,685 | 46,041 | 273,890 | 111,452
Operating income (loss) | 75,026 | 41,555 | 198,451 | 102,094
Other income (expense) |  |  |  |
Net gain (loss) on derivative instruments | (22,441) | 71,224 | 33,568 | 67,105
Interest expense | (672) | (291) | (1,816) | (836)
Other income | 909 | 242 | 1,988 | 269
Total other income (expense) | (22,204) | 71,175 | 33,740 | 66,538
Income before income taxes | 52,822 | 112,730 | 232,191 | 168,632
Income tax benefit (expense) | (20,087) | (41,285) | (87,170) | (62,800)
Net income | 32,735 | 71,445 | 145,021 | 105,832
Intercompany Eliminations [Member] |  |  |  |
Other income (expense) |  |  |  |
Equity in earnings in subsidiaries | (32,735) | (71,445) | (145,021) | (105,832)
Total other income (expense) | (32,735) | (71,445) | (145,021) | (105,832)
Income before income taxes | (32,735) | (71,445) | (145,021) | (105,832)
Net income | $ (32,735) | $ (71,445) | $ (145,021) | $ (105,832)

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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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