Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Nov. 30, 2019
Class of Stock [Line Items]          
Stock repurchase program, authorized amount         $ 5,000,000.0
Share repurchases $ 0 $ 0 $ 0 $ 0  
Economic interest percentage     39.60%    
Non-controlling interest holders          
Class of Stock [Line Items]          
Economic interest percentage     60.40%    
Class B Common Stock          
Class of Stock [Line Items]          
Antidilutive securities (in shares) 2,436,257 3,724,329 2,436,257 3,724,329  
Class C Common Stock          
Class of Stock [Line Items]          
Antidilutive securities (in shares) 70,301,343 77,791,218 70,301,343 77,791,218  
Stock Options          
Class of Stock [Line Items]          
Antidilutive securities (in shares) 1,388,350 1,078,154 1,388,350 1,078,154