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Summarized Financial Information Concerning Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Segment Reporting Information |  |  |  |  |  |  |  |  |
Revenues | $ 570,543 |  | $ 565,251 |  | $ 1,139,377 |  | $ 1,034,282 |  |
Inter-segment revenue | (57,556) |  | (86,817) |  | (114,700) |  | (174,213) |  |
Total revenues | 512,987 |  | 478,434 |  | 1,024,677 |  | 860,069 |  |
Income (loss) from operations | 86,458 | [1] | 762,413 | [1] | (273,068) | [2] | 610,757 | [2] |
Interest income (expense) | (61,159) |  | (68,569) |  | (147,069) |  | (135,534) |  |
Bargain purchase gain | 0 |  | 122,696 |  | 0 |  | 122,696 |  |
Loss on extinguishment of debt | 0 |  | 0 |  | (82,005) |  | 0 |  |
Other (expense) income, net | (106) |  | (81) |  | 505 |  | 2,387 |  |
Income (loss) before income taxes | 25,193 |  | 816,459 |  | (501,637) |  | 600,306 |  |
Capital expenditures | 387,158 | [3] | 562,054 | [3] | 775,870 | [3] | 1,131,712 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 180,368 |  |  |  | 363,009 |  |  |  |
Depreciation, depletion, amortization and accretion | 164,725 |  | 162,573 |  | 347,366 |  | 266,758 |  |
Total assets | 7,753,636 |  |  |  | 7,753,636 |  |  |  | 9,790,731
Exploration and Production |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Revenues | 458,374 |  | 434,834 |  | 939,784 |  | 777,955 |  |
Inter-segment revenue | (81) |  | (77) |  | (162) |  | (155) |  |
Total revenues | 458,293 |  | 434,757 |  | 939,622 |  | 777,800 |  |
Income (loss) from operations | 241,666 | [1] | 786,335 | [1] | (60,042) | [2] | 662,499 | [2] |
Interest income (expense) | 317 |  | 416 |  | 635 |  | 559 |  |
Bargain purchase gain |  |  | 122,696 |  |  |  | 122,696 |  |
Loss on extinguishment of debt |  |  |  |  | 0 |  |  |  |
Other (expense) income, net | (330) |  | 242 |  | 298 |  | 2,010 |  |
Income (loss) before income taxes | 241,653 |  | 909,689 |  | (59,109) |  | 787,764 |  |
Capital expenditures | 358,582 | [3] | 518,343 | [3] | 716,173 | [3] | 1,010,248 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 148,884 |  |  |  | 316,397 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  | 147,479 |  |  |  | 237,531 |  |
Total assets | 5,923,355 |  |  |  | 5,923,355 |  |  |  | 8,681,056
Drilling and Oil Field Services |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Revenues | 47,100 |  | 104,076 |  | 96,837 |  | 202,408 |  |
Inter-segment revenue | (31,011) |  | (70,444) |  | (63,378) |  | (139,467) |  |
Total revenues | 16,089 |  | 33,632 |  | 33,459 |  | 62,941 |  |
Income (loss) from operations | (19,443) | [1] | 4,678 | [1] | (28,408) | [2] | 8,157 | [2] |
Interest income (expense) | 0 |  | 0 |  | 0 |  | 0 |  |
Bargain purchase gain |  |  | 0 |  |  |  | 0 |  |
Loss on extinguishment of debt |  |  |  |  | 0 |  |  |  |
Other (expense) income, net | 0 |  | 0 |  | 0 |  | 0 |  |
Income (loss) before income taxes | (19,443) |  | 4,678 |  | (28,408) |  | 8,157 |  |
Capital expenditures | 883 | [3] | 5,836 | [3] | 1,515 | [3] | 13,752 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 19,478 |  |  |  | 28,292 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  | 8,624 |  |  |  | 17,174 |  |
Total assets | 172,329 |  |  |  | 172,329 |  |  |  | 199,523
Midstream Services |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Revenues | 64,291 |  | 24,798 |  | 101,125 |  | 50,960 |  |
Inter-segment revenue | (26,464) |  | (16,296) |  | (51,160) |  | (34,591) |  |
Total revenues | 37,827 |  | 8,502 |  | 49,965 |  | 16,369 |  |
Income (loss) from operations | (7,956) | [1] | (3,631) | [1] | (10,415) | [2] | (6,358) | [2] |
Interest income (expense) | (84) |  | (137) |  | (209) |  | (293) |  |
Bargain purchase gain |  |  | 0 |  |  |  | 0 |  |
Loss on extinguishment of debt |  |  |  |  | 0 |  |  |  |
Other (expense) income, net | 135 |  | 0 |  | (664) |  | 0 |  |
Income (loss) before income taxes | (7,905) |  | (3,768) |  | (11,288) |  | (6,651) |  |
Capital expenditures | 15,111 | [3] | 17,754 | [3] | 30,332 | [3] | 41,729 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 4,017 |  |  |  | 5,705 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  | 1,717 |  |  |  | 3,128 |  |
Total assets | 171,461 |  |  |  | 171,461 |  |  |  | 151,492
All Other |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Revenues | 778 |  | 1,543 |  | 1,631 |  | 2,959 |  |
Inter-segment revenue | 0 |  | 0 |  | 0 |  | 0 |  |
Total revenues | 778 |  | 1,543 |  | 1,631 |  | 2,959 |  |
Income (loss) from operations | (127,809) | [1] | (24,969) | [1] | (174,203) | [2] | (53,541) | [2] |
Interest income (expense) | (61,392) |  | (68,848) |  | (147,495) |  | (135,800) |  |
Bargain purchase gain |  |  | 0 |  |  |  | 0 |  |
Loss on extinguishment of debt |  |  |  |  | (82,005) |  |  |  |
Other (expense) income, net | 89 |  | (323) |  | 871 |  | 377 |  |
Income (loss) before income taxes | (189,112) |  | (94,140) |  | (402,832) |  | (188,964) |  |
Capital expenditures | 12,582 | [3] | 20,121 | [3] | 27,850 | [3] | 65,983 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 7,989 |  |  |  | 12,615 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  | 4,753 |  |  |  | 8,925 |  |
Total assets | $ 1,486,491 |  |  |  | $ 1,486,491 |  |  |  | $ 758,660
[1] | Exploration and production segment income from operations includes unrealized gains of $85.9 million and $580.7 million on commodity derivative contracts for the three-month periods ended June 30, 2013 and 2012, respectively.
[2] | Exploration and production segment (loss) income from operations includes unrealized gains of $61.1 million and $451.5 million on commodity derivative contracts for the six-month periods ended June 30, 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 six-month period ended June 30, 2013.
[3] | On an accrual basis.

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