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Stock-Based Incentive Plans - Movement in Outstanding Shares of Restricted Class A Common Stock and Weighted-Average Grant Date Fair Value Per Share (Detail) - Restricted Class A Common Stock - $ / shares
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Restricted Class A Common Stock    
Beginning balance (in shares) 1,706,121  
Granted (in shares) 440,831  
Vested (in shares) (521,692)  
Forfeited (in shares) (4,000) (28,971)
Ending balance (in shares) 1,621,260  
Weighted-Average Grant Date Fair Value Per Share    
Beginning balance (in dollars per share) $ 31.19  
Granted (in dollars per share) 30.96  
Vested (in dollars per share) 32.05  
Forfeited (in dollars per share) 31.57  
Ending balance (in dollars per share) $ 30.85