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