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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax benefit | $ (68,784,000) | $ 24,137,000 | $ (28,518,000) | $ 42,676,000 | $ (349,080,000) | $ (71,992,000) | $ 57,651,000 | $ 112,395,000 | $ (30,489,000) | $ (251,026,000) | $ (280,750,000)
Corporate tax rate |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
Deferred tax liabilities | 666,668,000 |  |  |  | $ 693,356,000 |  |  |  | $ 666,668,000 | $ 693,356,000 |
Accrued interest or penalties related to tax amounts | 0 |  |  |  |  |  |  |  | $ 0 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2037 |  |
Amendment on Internal Revenue Code of 1986 |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Corporate tax rate |  |  |  |  |  |  |  |  | 21.00% | 35.00% |
One-time tax benefit related to tax law changes |  |  |  |  |  |  |  |  |  | $ 334,000,000 |
Louisiana, Oklahoma, Pennsylvania, Texas and West Virginia |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Valuation allowances | 101,400,000 |  |  |  |  |  |  |  | $ 101,400,000 |  |
Federal |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Valuation allowances | 19,000,000 |  |  |  |  |  |  |  | 19,000,000 |  |
Federal and State |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 2,000,000,000 |  |  |  |  |  |  |  | 2,000,000,000 |  |
Unexpired net operating loss carryforwards | 520,100,000 |  |  |  |  |  |  |  | 520,100,000 |  |
Pennsylvania |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 882,700,000 |  |  |  |  |  |  |  | $ 882,700,000 |  |
Pennsylvania | Minimum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2025 |  |
Pennsylvania | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2038 |  |
Louisiana |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | $ 338,600,000 |  |  |  |  |  |  |  | $ 338,600,000 |  |
Louisiana | Minimum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2034 |  |
Louisiana | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2038 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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