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Long-Term Debt - Narrative (Details) - USD ($)
shares in Thousands
8 Months Ended 12 Months Ended
Mar. 23, 2020
Sep. 12, 2019
Dec. 31, 2020
Jun. 11, 2020
May 07, 2020
Mar. 20, 2020
Dec. 31, 2019
Sep. 13, 2019
Debt Instrument [Line Items]                
Shares issued during the period, value     $ 852,407,000          
Credit Agreement                
Debt Instrument [Line Items]                
Mandatory prepayment as a percentage of assets sold     100.00%          
Mandatory prepayment, no prepayment required if net proceeds are invested (or committed to be invested), period post receipt of net proceeds     12 months          
Credit Agreement | Prepayment Percentage One                
Debt Instrument [Line Items]                
Prepayment as a percentage of principal amount outstanding     50.00%          
Credit Agreement | Prepayment Percentage One | Minimum                
Debt Instrument [Line Items]                
Net debt to leverage ratio     4.50          
Credit Agreement | Prepayment Percentage Two                
Debt Instrument [Line Items]                
Prepayment as a percentage of principal amount outstanding     25.00%          
Credit Agreement | Prepayment Percentage Two | Minimum                
Debt Instrument [Line Items]                
Net debt to leverage ratio     4.00          
Credit Agreement | Prepayment Percentage Two | Maximum                
Debt Instrument [Line Items]                
Net debt to leverage ratio     4.50          
Credit Agreement | Prepayment Percentage Three                
Debt Instrument [Line Items]                
Prepayment as a percentage of principal amount outstanding     0.00%          
Credit Agreement | Prepayment Percentage Three | Maximum                
Debt Instrument [Line Items]                
Net debt to leverage ratio     4.00          
Credit Agreement | LIBOR                
Debt Instrument [Line Items]                
Debt instrument variable interest rate spread     6.50%          
Credit Agreement | Class B common stock                
Debt Instrument [Line Items]                
Shares issued during the period (in shares) 6,667              
Shares issued during the period, value $ 10,000,000.0              
Credit Agreement | Term Loan Facility | Alternate Base Rate                
Debt Instrument [Line Items]                
Debt instrument variable interest rate spread     5.50%          
Secured debt                
Debt Instrument [Line Items]                
Debt Instrument, effective interest rate     7.50%       8.40%  
Secured debt | Term Loan Facility                
Debt Instrument [Line Items]                
Credit facility, aggregate principal amount               $ 300,000,000.0
Debt issuance costs     $ 9,300,000          
Amount outstanding     $ 296,300,000          
Mandatory prepayment as a percentage of amount raised on debt issue     100.00%          
Debt instrument periodic payment percentage     0.25%          
Secured debt | Incremental Term Loan Facility                
Debt Instrument [Line Items]                
Credit facility, aggregate principal amount           $ 117,000,000.0    
Debt issuance costs     $ 6,000,000.0          
Amount outstanding     $ 116,100,000          
Mandatory prepayment as a percentage of amount raised on debt issue     100.00%          
Debt instrument periodic payment percentage     0.25%          
Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit remaining borrowing capacity     $ 58,000,000.0          
Revolving Credit Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Credit facility, aggregate principal amount               $ 30,000,000.0
Amount outstanding     $ 0          
Commitment fee percentage due to unused commitments     0.50%          
Revolving Credit Facility | Incremental Revolving Credit Facility                
Debt Instrument [Line Items]                
Credit facility, aggregate principal amount         $ 20,000,000.0      
Debt issuance costs     $ 200,000          
Amount outstanding     $ 0          
Commitment fee percentage due to unused commitments     0.50%          
Revolving Credit Facility | Incremental No.3 Revolving Credit Facility                
Debt Instrument [Line Items]                
Credit facility, aggregate principal amount       $ 8,000,000.0        
Debt issuance costs     $ 100,000          
Amount outstanding     $ 0          
Commitment fee percentage due to unused commitments     0.50%          
Revolving Credit Facility | Predecessor Credit Facility | Norvax                
Debt Instrument [Line Items]                
Line of credit current borrowing capacity   $ 16,000,000.0            
Line of credit current borrowing capacity as a percentage of trade receivables   80.00%            
Line of credit current borrowing capacity as a percentage of enrollment/commission fees earned   40.00%            
Revolving Credit Facility | Predecessor Credit Facility | LIBOR | Norvax                
Debt Instrument [Line Items]                
Debt instrument variable interest rate spread   2.50%            
Revolving Credit Facility | Predecessor Credit Facility | Prime Rate | Norvax                
Debt Instrument [Line Items]                
Debt instrument variable interest rate spread   (0.50%)