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Equity-Based Compensation - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized common stock 8,200,000    
Equity incentive plan available for future grant 974,746    
Annual increments in employee grants 25.00%    
Stock options, contractual term 10 years    
Equity-based compensation expense $ 22,504,000 $ 17,307,000 $ 22,001,000
Vesting targets 500,000 (6,400,000) (5,500,000)
Unrecognized compensation expense related to unvested options $ 36,900,000    
Vesting period 1 year 2 months 12 days    
Warrant outstanding $ 0    
Deferred income tax benefit 53,108,000 1,089,000 (6,737,000)
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred income tax benefit $ 5,500,000 $ 4,000,000.0 $ 6,600,000
Restricted Stock Award [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock Award [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Restricted Stock Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
Number of shares issuable at the end of the vesting period, percentage 0.00%    
Restricted Stock Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Number of shares issuable at the end of the vesting period, percentage 200.00%