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Long-term Debt (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 02, 2021
Jul. 31, 2021
May 31, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Nov. 30, 2018
Debt Instrument [Line Items]                    
Repayment of term loan             $ 524,300,000 $ 4,012,000    
Loss on debt extinguishment         $ (7,748,000) $ 0 (7,748,000) 0    
Proceeds from long term line of credit             0 40,000,000    
Repayment of long term line of credit             $ 0 $ 40,000,000    
2018 Term Loan                    
Debt Instrument [Line Items]                    
Debt instrument face value                   $ 535,000,000.0
Repayment of term loan $ 521,600,000 $ 521,600,000                
Loss on debt extinguishment   7,700,000                
Effective interest rate                 5.10%  
2018 Revolving Facility                    
Debt Instrument [Line Items]                    
Debt instrument face value                   $ 40,000,000.0
2018 Revolving Facility | Covid-19                    
Debt Instrument [Line Items]                    
Proceeds from long term line of credit       $ 40,000,000            
Repayment of long term line of credit     $ 40,000,000              
2018 Amended and Restated Revolving Facility                    
Debt Instrument [Line Items]                    
Line of credit maximum borrowing capacity   150,000,000.0                
Debt issuance costs   $ 800,000                
One month LIBOR floor   1.00%                
Rate added to one month LIBOR   1.00%                
LIBOR floor   0.00%                
Rate added to LIBOR   2.00%                
Basis spread on variable rate, initial reduction   0.25%                
Basis spread on variable rate, further reduction   0.25%                
Total net first lien leverage ratio, first reduction requirement   3.50                
Total net first lien leverage ratio, second reduction requirement   2.50                
Commitment fee   0.35%                
Commitment fee reduction   0.10%                
Total net first lien leverage ratio, maximum   3.50                
2018 Amended and Restated Revolving Facility | Federal Funds Effective Rate                    
Debt Instrument [Line Items]                    
Effective interest rate   0.50%                
Letter of Credit                    
Debt Instrument [Line Items]                    
Line of credit maximum borrowing capacity   $ 20,000,000.0                
Swingline Loan                    
Debt Instrument [Line Items]                    
Line of credit maximum borrowing capacity   $ 10,000,000.0