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Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Sep. 16, 2019
Jun. 30, 2020
Jun. 30, 2019
Subsidiary, Sale of Stock [Line Items]      
Deferred offering costs   $ 0 $ 1,946
Common Class A      
Subsidiary, Sale of Stock [Line Items]      
Proceeds from initial public offer $ 410,800    
IPO | Common Class A      
Subsidiary, Sale of Stock [Line Items]      
Common stock new issue shares (in shares) 11,500,000    
IPO offer price per share (in dollars per share) $ 39.00    
Deferred offering costs $ 37,700    
IPO | Common Class A | Underwriter Offer      
Subsidiary, Sale of Stock [Line Items]      
Common stock new issue shares (in shares) 1,500,000