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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]                
Income tax benefit $ (36,509,000) $ (22,266,000) $ 28,998,000 $ 6,732,000 $ (29,777,000) $ (25,552,000) $ (500,291,000) $ (30,489,000)
Deferred tax liabilities           135,267,000 160,196,000  
Accrued interest or penalties related to tax amounts           $ 0    
Minimum                
Income Taxes [Line Items]                
Period during which net operating loss carryforwards and alternative minimum tax expire           Dec. 31, 2021    
Maximum                
Income Taxes [Line Items]                
Period during which net operating loss carryforwards and alternative minimum tax expire           Dec. 31, 2038    
State                
Income Taxes [Line Items]                
Valuation allowances           $ 226,520,000 158,296,000  
Federal                
Income Taxes [Line Items]                
Valuation allowances           152,499,000 32,530,000  
Federal and State                
Income Taxes [Line Items]                
Net operating loss carryforwards           3,200,000,000    
Net operating loss carryforward subject to expiration             $ 1,400,000,000  
Net operating loss carryforward not subject to expiration           1,800,000,000    
Pennsylvania                
Income Taxes [Line Items]                
Net operating loss carryforwards           $ 935,000,000.0    
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, 2040    
Louisiana                
Income Taxes [Line Items]                
Net operating loss carryforwards           $ 1,400,000,000    
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, 2040