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Stock-Based Incentive Plans - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
plan
shares
Dec. 31, 2023
shares
Jun. 30, 2022
plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of benefit plans | plan 2   9
Number of expired benefit plans | plan     7
Restricted Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted shares, vesting period (in years) 3 years    
Number of shares of restricted class A common stock outstanding (in shares) 1,627,201 2,180,181  
Unrecognized compensation cost relating to nonvested share-based compensation | $ $ 35.5    
Unrecognized compensation cost expected to be recognized over weighted average period (in years) 1 year    
Vest in 2024 | Restricted Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted class A common stock outstanding (in shares) 304,887    
Vest in 2025 | Restricted Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted class A common stock outstanding (in shares) 881,763    
Vest in 2026 | Restricted Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted class A common stock outstanding (in shares) 440,551    
Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares available under plan (in shares) 10,400,000    
Number of shares available under plan (in shares) 7,310,409