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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
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Class A Common Stock      
Beginning balance (in shares) 1,627,890 1,698,582  
Granted (in shares) 1,065,755 934,502  
Vested (in shares) (957,944) (1,004,315)  
Forfeited (in shares) (29,580) (879) (17,565)
Ending balance (in shares) 1,706,121 1,627,890 1,698,582
Weighted-Average Grant Date Fair Value Per Share      
Beginning balance (in USD per share) $ 33.14 $ 34.52  
Granted (in USD per share) 29.93 31.83  
Vested (in USD per share) 33.08 34.26  
Forfeited (in USD per share) 31.52 34.57  
Ending balance (in USD per share) $ 31.19 $ 33.14 $ 34.52