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Stockholders' Equity - Authorized and Outstanding Equity (Details)
Sep. 30, 2021
vote
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Class of Stock [Line Items]    
Common stock, shares, outstanding (in shares) 79,039,639 78,572,110
Restricted Stock    
Class of Stock [Line Items]    
Unvested - Number of awards (in shares) 5,251,822 5,293,642
Class A Common Stock    
Class of Stock [Line Items]    
Common stock, par value per share (in dollars per share) | $ / shares $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares, outstanding (in shares) 65,215,891 63,131,007
Common stock votes per share | vote 1  
Class B Common Stock    
Class of Stock [Line Items]    
Common stock, par value per share (in dollars per share) | $ / shares $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares, outstanding (in shares) 3,632,687 4,457,958
Common stock votes per share | vote 1  
Class C Common Stock    
Class of Stock [Line Items]    
Common stock, par value per share (in dollars per share) | $ / shares $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares, outstanding (in shares) 10,191,061 10,983,145
Common stock votes per share | vote 1  
Holdings GP Units | Restricted Stock    
Class of Stock [Line Items]    
Unvested - Number of awards (in shares) 5,142,292