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Equity-based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract]      
Shares, Outstanding, Beginning Balance 7,782,437    
Shares, Granted 2,182,773 2,832,784 2,209,597
Shares, Exercised (1,517,735)    
Shares, Cancelled or forfeited (345,495)    
Shares, Outstanding, Ending Balance 8,101,980 7,782,437  
Shares, Exercisable 3,838,372    
Shares, Vested or expected to vest 8,101,980    
Weighted-Average Exercise Price, Outstanding, Beginning Balance $ 31.30    
Weighted-Average Exercise Price, Granted 68.91 $ 39.16 $ 51.73
Weighted-Average Exercise Price, Exercised 23.53    
Weighted-Average Exercise Price, Cancelled or forfeited 41.61    
Weighted-Average Exercise Price, Outstanding, Ending Balance 42.44 $ 31.30  
Weighted-Average Exercise Price, Exercisable 30.43    
Weighted-Average Exercise Price, Vested or expected to vest $ 42.44    
Weighted-Average Remaining Contractual Term 7 years 9 months 18 days 8 years 2 months 12 days  
Weighted-Average Remaining Contractual Term, Exercisable 7 years    
Weighted-Average Remaining Contractual Term, Vested or expected to vest 7 years 9 months 18 days    
Aggregate Intrinsic Value, Outstanding Balance $ 896,666 $ 231,554  
Aggregate Intrinsic Value, Exercisable 470,907    
Aggregate Intrinsic Value, Vested or expected to vest $ 896,666