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Summarized Financial Information Concerning Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 568,834 |  | $ 469,030 |  |
Inter-segment revenue | (57,144) |  | (87,395) |  |
Total revenues | 511,690 |  | 381,635 |  |
(Loss) income from operations | (359,526) | [1] | (151,656) | [1] |
Interest income (expense), net | (85,910) |  | (66,965) |  |
Loss on extinguishment of debt | (82,005) |  | 0 |  |
Other income (expense), net | 611 |  | 2,468 |  |
Loss before income taxes | (526,830) |  | (216,153) |  |
Capital expenditures | 388,712 | [2] | 569,658 | [2] |
Depreciation, depletion, amortization and accretion | 182,641 |  | 104,186 |  |
Total assets | 7,678,311 |  |  |  | 9,790,731
Exploration and Production |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 481,410 |  | 343,120 |  |
Inter-segment revenue | (81) |  | (77) |  |
Total revenues | 481,329 |  | 343,043 |  |
(Loss) income from operations | (301,707) | [1] | (123,836) | [1] |
Interest income (expense), net | 318 |  | 143 |  |
Loss on extinguishment of debt | 0 |  |  |  |
Other income (expense), net | 628 |  | 1,768 |  |
Loss before income taxes | (300,761) |  | (121,925) |  |
Capital expenditures | 357,591 | [2] | 491,905 | [2] |
Depreciation, depletion, amortization and accretion | 167,513 |  | 90,052 |  |
Total assets | 5,647,302 |  |  |  | 8,681,056
Drilling and Oil Field Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 49,737 |  | 98,332 |  |
Inter-segment revenue | (32,367) |  | (69,023) |  |
Total revenues | 17,370 |  | 29,309 |  |
(Loss) income from operations | (8,965) | [1] | 3,479 | [1] |
Interest income (expense), net | 0 |  | 0 |  |
Loss on extinguishment of debt | 0 |  |  |  |
Other income (expense), net | 0 |  | 0 |  |
Loss before income taxes | (8,965) |  | 3,479 |  |
Capital expenditures | 632 | [2] | 7,916 | [2] |
Depreciation, depletion, amortization and accretion | 8,814 |  | 8,550 |  |
Total assets | 192,087 |  |  |  | 199,523
Midstream Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 36,834 |  | 26,162 |  |
Inter-segment revenue | (24,696) |  | (18,295) |  |
Total revenues | 12,138 |  | 7,867 |  |
(Loss) income from operations | (2,459) | [1] | (2,727) | [1] |
Interest income (expense), net | (125) |  | (156) |  |
Loss on extinguishment of debt | 0 |  |  |  |
Other income (expense), net | (800) |  | 0 |  |
Loss before income taxes | (3,384) |  | (2,883) |  |
Capital expenditures | 15,221 | [2] | 23,975 | [2] |
Depreciation, depletion, amortization and accretion | 1,687 |  | 1,411 |  |
Total assets | 159,843 |  |  |  | 151,492
All Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 853 |  | 1,416 |  |
Inter-segment revenue | 0 |  | 0 |  |
Total revenues | 853 |  | 1,416 |  |
(Loss) income from operations | (46,395) | [1] | (28,572) | [1] |
Interest income (expense), net | (86,103) |  | (66,952) |  |
Loss on extinguishment of debt | (82,005) |  |  |  |
Other income (expense), net | 783 |  | 700 |  |
Loss before income taxes | (213,720) |  | (94,824) |  |
Capital expenditures | 15,268 | [2] | 45,862 | [2] |
Depreciation, depletion, amortization and accretion | 4,627 |  | 4,173 |  |
Total assets | $ 1,679,079 |  |  |  | $ 758,660
[1] | Exploration and production segment income from operations includes unrealized losses of $24.8 million and $129.2 million on commodity derivative contracts for the three-month periods ended March 31, 2013 and 2012, respectively. Exploration and production segment also includes a loss on the sale of the Permian Properties of $399.1 million for the three-month period ended March 31, 2013.
[2] | On an accrual basis.

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