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Stock-Based Compensation Expense (Narrative) (Detail)
$ in Millions
12 Months Ended
Jun. 04, 2018
shares
Dec. 31, 2020
USD ($)
installment
shares
Dec. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Period of additional tranche conditional upon termination 1 year    
Period preceding change in control when terminated employee becomes vested in all unvested awards 3 months    
Period following change in control when terminated employee becomes vested in all unvested awards 12 months    
Stock-based compensation expense, tax   $ 0.9 $ 1.4
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested awards   $ 2.2 $ 2.2
Weighted-average recognition period   2 years 4 months 24 days 2 years 4 months 24 days
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested awards   $ 3.5 $ 5.5
Weighted-average recognition period   1 year 10 months 24 days 1 year 10 months 24 days
Accelerated Vesting Due To Termination      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accelerated vesting 50.00%    
Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) | shares 2,222,223    
Class A Common Stock | 2020 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant (in shares) | shares   2,100,000  
Management | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual term   5 years  
Vesting period   4 years  
Management | First and second anniversaries | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights   30.00%  
Management | Third and fourth anniversaries | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights   20.00%  
Non Employee Directors | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual term   5 years  
Number of annual award vesting installments | installment   4