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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |
Income tax benefit | $ 9,743,000 | $ 25,552,000 | $ 500,291,000
Deferred tax liabilities | 117,642,000 | 135,267,000 |
Accrued interest or penalties related to tax amounts | 0 |  |
Total deferred tax assets | 786,425,000 | 720,191,000 |
Change in Valuation Allowances | $ 108,000,000.0 | 188,200,000 | $ 70,500,000
Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire | Dec. 31, 2030 |  |
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 | $ 203,085,000 | 226,520,000 |
Federal |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances | 67,984,000 | $ 152,499,000 |
Federal and State |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 2,900,000,000 |  |
Net operating loss carryforward subject to expiration | 1,200,000,000 |  |
Net operating loss carryforward not subject to expiration | 1,700,000,000 |  |
Pennsylvania |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | $ 861,000,000.0 |  |
Pennsylvania | Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire | Dec. 31, 2028 |  |
Pennsylvania | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire | Dec. 31, 2040 |  |
Louisiana |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforward not subject to expiration | $ 1,500,000,000 |  |

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