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Discontinued Operations - Components of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues and other income: |  |  |  |  |  |  |  |  |  |  |  |
Natural gas, NGLs and oil sales | $ 448,545 | $ 431,214 | $ 437,678 | $ 398,239 | $ 398,688 | $ 337,040 | $ 298,349 | $ 317,617 | $ 1,715,676 | $ 1,351,694 | $ 1,173,266 |
Gain on the sale of assets | 3,162 | 6,008 | 83,287 | (166) | 61,836 | 949 | (3,227) | (10,426) | 92,291 | 49,132 | 2,259 |
Total revenues and other income | 428,086 | 442,038 | 673,356 | 319,239 | 458,038 | 299,780 | 448,931 | 250,955 | 1,862,719 | 1,457,704 | 1,230,642 |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Direct operating | 34,360 | 30,907 | 32,636 | 30,188 | 30,214 | 29,628 | 27,041 | 29,022 | 128,091 | 115,905 | 112,972 |
Transportation, gathering and compression | 66,820 | 60,958 | 66,048 | 62,416 | 55,281 | 51,600 | 44,744 | 40,820 | 256,242 | 192,445 | 120,755 |
Production and ad valorem taxes | 11,290 | 11,454 | 11,113 | 11,383 | 9,881 | 8,819 | 11,786 | 36,634 | 45,240 | 67,120 | 27,666 |
Exploration | 14,065 | 20,496 | 13,068 | 16,780 | 18,022 | 14,752 | 15,517 | 21,516 | 64,409 | 69,807 | 81,367 |
Interest expense | 44,955 | 44,321 | 45,071 | 42,210 | 44,708 | 43,997 | 42,888 | 37,205 | 176,557 | 168,798 | 125,052 |
Depletion, depreciation and amortization | 126,958 | 130,343 | 119,995 | 115,101 | 113,216 | 123,059 | 108,802 | 100,151 | 492,397 | 445,228 | 341,221 |
Total costs and expenses | 428,238 | 410,994 | 431,879 | 442,029 | 375,112 | 382,690 | 354,248 | 320,598 | 1,713,140 | 1,432,648 | 1,152,379 |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |
Current | (143) |  | (25) | 25 | (1,778) |  |  |  | (143) | (1,778) | 637 |
Deferred | (28,180) | 11,866 | 97,519 | (47,205) | 31,742 | (29,074) | 39,007 | (27,843) | 34,000 | 13,832 | 34,920 |
Total income tax | (28,323) | 11,866 | 97,494 | (47,180) | 29,964 | (29,074) | 39,007 | (27,843) | 33,857 | 12,054 | 35,557 |
Net income from discontinued operations |  |  |  |  |  |  |  |  |  |  | 15,320 |
Discontinued operations |  |  |  |  |  |  |  |  |  |  |  |
Revenues and other income: |  |  |  |  |  |  |  |  |  |  |  |
Natural gas, NGLs and oil sales |  |  |  |  |  |  |  |  |  |  | 59,185 |
Gain on the sale of assets |  |  |  |  |  |  |  |  |  |  | 4,771 |
Other |  |  |  |  |  |  |  |  |  |  | 10 |
Total revenues and other income |  |  |  |  |  |  |  |  |  |  | 63,966 |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Direct operating |  |  |  |  |  |  |  |  |  |  | 10,080 |
Transportation, gathering and compression |  |  |  |  |  |  |  |  |  |  | 5,257 |
Production and ad valorem taxes |  |  |  |  |  |  |  |  |  |  | 1,309 |
Exploration |  |  |  |  |  |  |  |  |  |  | 37 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 14,791 | [1]
Depletion, depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 8,894 |
Total costs and expenses |  |  |  |  |  |  |  |  |  |  | 40,368 |
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 23,598 |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  |  |  |  |
Deferred |  |  |  |  |  |  |  |  |  |  | 8,278 |
Total income tax |  |  |  |  |  |  |  |  |  |  | 8,278 |
Net income from discontinued operations |  |  |  |  |  |  |  |  |  |  | $ 15,320 |
[1] | Interest expense is allocated to discontinued operations based on the ratio of net assets of discontinued operations to our consolidated net assets plus long-term debt.

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- Definition Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph 15 -Article 3 + Details
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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 Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64954-109465 Reference 2: 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=27015464&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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