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Prepetition Revolving Credit Facility, Senior Notes and Exit Debt - Additional Information (Detail) - USD ($)
4 Months Ended
Apr. 23, 2021
Sep. 30, 2021
Jan. 31, 2021
Dec. 31, 2020
Apr. 28, 2020
Apr. 26, 2020
Debt Instrument [Line Items]            
Borrowings outstanding       $ 436,000,000    
Accrued interest       $ 47,636,000    
Unamortized premium   $ 800,000        
Debt issuance costs   $ 3,500,000        
Senior Notes [Member]            
Debt Instrument [Line Items]            
Accrued interest $ 44,900,000          
Pre-tax gain on extinguishment of debt 1,100,000,000          
Prepetition Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Borrowings outstanding     $ 442,000,000.0     $ 436,000,000.0
Amount available for general purposes         $ 442,000,000.0 $ 950,000,000.0
Claims settled in cash 279,600,000          
Aggregate amount of rollover debt $ 200,000,000.0          
Prepetition Revolving Credit Facility [Member] | Financial Letter of Credit [Member]            
Debt Instrument [Line Items]            
Borrowings outstanding     $ 6,000,000.0