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Stock-Based Compensation - Summary of Restricted Stock Units Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Weighted Average Grant Date Fair Value      
Taxes paid related to net share settlement of equity $ 21.8 $ 17.9  
RSUs      
Number of Awards      
Balance as of the beginning of the period (in shares) 29,943,818    
Granted (in shares) 24,238,196    
Vested and converted to common stock (in shares) (18,204,182)    
Forfeited (in shares) (3,111,621)    
Balance as of the end of period (in shares) 32,866,211    
Weighted Average Grant Date Fair Value      
Balance as of the beginning of the period (in dollars per share) $ 4.52   $ 5.15
Granted (in dollars per share) 3.62    
Vested and converted to common stock (in dollars per share) 4.35    
Forfeited (in dollars per share) 4.61    
Balance as of the end of period (in dollars per share) $ 4.52    
Taxes paid related to net share settlement of equity $ 21.8    
Common Class A | RSUs      
Weighted Average Grant Date Fair Value      
Shares issued in period (in shares) 18,200,000    
Shares withheld for tax withholding obligation (in shares) 6,100,000