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Summarized Financial Information Concerning Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | $ 493,603 |  | $ 532,798 |  | $ 1,518,280 |  | $ 1,392,867 |  |
Income (loss) from operations | 6,088 | [1] | (75,871) | [1] | (266,980) | [2] | 534,886 | [2] |
Interest income (expense) | (61,385) |  | (81,894) |  | (208,454) |  | (217,428) |  |
Bargain purchase gain | 0 |  | 0 |  | 0 |  | 122,696 |  |
Loss on extinguishment of debt | 0 |  | (3,056) |  | (82,005) |  | (3,056) |  |
Other (expense) income, net | 658 |  | 1,242 |  | 1,163 |  | 3,629 |  |
(Loss) income before income taxes | (54,639) |  | (159,579) |  | (556,276) |  | 440,727 |  |
Capital expenditures | 322,582 | [3] | 560,058 | [3] | 1,098,452 | [3] | 1,691,770 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 162,068 |  |  |  | 525,077 |  |  |  |
Depreciation, depletion, amortization and accretion | 161,381 |  | 191,676 |  | 508,747 |  | 458,434 |  |
Total assets | 7,669,444 |  |  |  | 7,669,444 |  |  |  | 9,790,731
Exploration and Production |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | 462,503 |  | 493,774 |  | 1,402,125 |  | 1,271,574 |  |
Income (loss) from operations | (11,604) | [1] | (48,454) | [1] | (71,645) | [2] | 614,045 | [2] |
Interest income (expense) | 331 |  | 351 |  | 757 |  | 910 |  |
Bargain purchase gain |  |  |  |  |  |  | 122,696 |  |
Loss on extinguishment of debt |  |  | 0 |  | 0 |  | 0 |  |
Other (expense) income, net | (350) |  | (260) |  | 157 |  | 1,750 |  |
(Loss) income before income taxes | (11,623) |  | (48,363) |  | (70,731) |  | 739,401 |  |
Capital expenditures | 292,697 | [3] | 500,366 | [3] | 1,008,869 | [3] | 1,510,614 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 146,286 |  |  |  | 462,683 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  | 175,393 |  |  |  | 412,924 |  |
Total assets | 6,009,608 |  |  |  | 6,009,608 |  |  |  | 8,681,056
Drilling and Oil Field Services |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | 16,192 |  | 27,760 |  | 49,651 |  | 90,701 |  |
Income (loss) from operations | (8,276) | [1] | 2,515 | [1] | (36,684) | [2] | 10,672 | [2] |
Interest income (expense) | 0 |  | 0 |  | 0 |  | 0 |  |
Bargain purchase gain |  |  |  |  |  |  | 0 |  |
Loss on extinguishment of debt |  |  | 0 |  | 0 |  | 0 |  |
Other (expense) income, net | 0 |  | 0 |  | 0 |  | 0 |  |
(Loss) income before income taxes | (8,276) |  | 2,515 |  | (36,684) |  | 10,672 |  |
Capital expenditures | 3,142 | [3] | 14,571 | [3] | 4,657 | [3] | 28,323 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 8,252 |  |  |  | 36,544 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  | 8,706 |  |  |  | 25,880 |  |
Total assets | 166,485 |  |  |  | 166,485 |  |  |  | 199,523
Midstream Services |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | 14,141 |  | 10,319 |  | 64,105 |  | 26,688 |  |
Income (loss) from operations | (7,691) | [1] | (3,434) | [1] | (18,106) | [2] | (9,792) | [2] |
Interest income (expense) | 0 |  | (136) |  | 0 |  | (429) |  |
Bargain purchase gain |  |  |  |  |  |  | 0 |  |
Loss on extinguishment of debt |  |  | 0 |  | 0 |  | 0 |  |
Other (expense) income, net | (41) |  | 0 |  | (914) |  | 0 |  |
(Loss) income before income taxes | (7,732) |  | (3,570) |  | (19,020) |  | (10,221) |  |
Capital expenditures | 16,551 | [3] | 20,229 | [3] | 46,883 | [3] | 61,958 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 2,128 |  |  |  | 7,832 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  | 2,042 |  |  |  | 5,170 |  |
Total assets | 185,131 |  |  |  | 185,131 |  |  |  | 151,492
All Other |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | 767 |  | 945 |  | 2,399 |  | 3,904 |  |
Income (loss) from operations | 33,659 | [1] | (26,498) | [1] | (140,545) | [2] | (80,039) | [2] |
Interest income (expense) | (61,716) |  | (82,109) |  | (209,211) |  | (217,909) |  |
Bargain purchase gain |  |  |  |  |  |  | 0 |  |
Loss on extinguishment of debt |  |  | (3,056) |  | (82,005) |  | (3,056) |  |
Other (expense) income, net | 1,049 |  | 1,502 |  | 1,920 |  | 1,879 |  |
(Loss) income before income taxes | (27,008) |  | (110,161) |  | (429,841) |  | (299,125) |  |
Capital expenditures | 10,192 | [3] | 24,892 | [3] | 38,043 | [3] | 90,875 | [3] |
Depreciation, depletion, amortization, accretion and impairment | 5,402 |  |  |  | 18,018 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  | 5,535 |  |  |  | 14,460 |  |
Total assets | 1,308,220 |  |  |  | 1,308,220 |  |  |  | 758,660
Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | 545,752 |  | 621,001 |  | 1,685,130 |  | 1,655,283 |  |
Operating Segments | Exploration and Production |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | 462,582 |  | 493,848 |  | 1,402,366 |  | 1,271,803 |  |
Operating Segments | Drilling and Oil Field Services |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | 44,527 |  | 95,307 |  | 141,364 |  | 297,715 |  |
Operating Segments | Midstream Services |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | 37,876 |  | 30,901 |  | 139,001 |  | 81,861 |  |
Operating Segments | All Other |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | 767 |  | 945 |  | 2,399 |  | 3,904 |  |
Intersegment Eliminations |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | (52,149) |  | (88,203) |  | (166,850) |  | (262,416) |  |
Intersegment Eliminations | Exploration and Production |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | (79) |  | (74) |  | (241) |  | (229) |  |
Intersegment Eliminations | Drilling and Oil Field Services |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | (28,335) |  | (67,547) |  | (91,713) |  | (207,014) |  |
Intersegment Eliminations | Midstream Services |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | (23,735) |  | (20,582) |  | (74,896) |  | (55,173) |  |
Intersegment Eliminations | All Other |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |
Total revenues | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  |
[1] | Exploration and production segment loss from operations includes losses due to changes in fair value of commodity derivative contracts of $119.6 million and $222.5 million for the three-month periods ended September 30, 2013 and 2012, respectively.
[2] | Exploration and production segment (loss) income from operations includes losses (gains) due to changes in fair value of commodity derivative contracts of $58.5 million and $(229.1) million for the nine-month periods ended September 30, 2013 and 2012, respectively. Exploration and production segment loss from operations also includes a loss on the sale of the Permian Properties of $398.9 million for the nine-month period ended September 30, 2013.
[3] | Presented on an accrual basis.

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