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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax benefit | $ (498,859,000) | $ (47,219,000) | $ 40,099,000 | $ 5,688,000 | $ (68,784,000) | $ 24,137,000 | $ (28,518,000) | $ 42,676,000 | $ (500,291,000) | $ (30,489,000) | $ (251,026,000)
Deferred tax liabilities | 160,196,000 |  |  |  | 666,668,000 |  |  |  | 160,196,000 | 666,668,000 |
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, 2020 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2037 |  |
State |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Valuation allowances | 158,296,000 |  |  |  | 101,372,000 |  |  |  | $ 158,296,000 | 101,372,000 |
Federal |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Valuation allowances | 32,530,000 |  |  |  | $ 18,975,000 |  |  |  | 32,530,000 | $ 18,975,000 |
Federal and State |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 2,100,000,000 |  |  |  |  |  |  |  | 2,100,000,000 |  |
Net operating loss carryforward subject to expiration | 1,400,000,000 |  |  |  |  |  |  |  | 1,400,000,000 |  |
Net operating loss carryforward not subject to expiration | 712,800,000 |  |  |  |  |  |  |  | 712,800,000 |  |
Pennsylvania |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 856,300,000 |  |  |  |  |  |  |  | $ 856,300,000 |  |
Pennsylvania | Minimum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2027 |  |
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 | $ 561,100,000 |  |  |  |  |  |  |  | $ 561,100,000 |  |
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, 2039 |  |

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