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Stockholders' Equity - Authorized and Outstanding Equity (Details)
Sep. 30, 2020
vote
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Class of Stock [Line Items]    
Common stock, shares, outstanding 78,575,100 77,801,854
Restricted Stock    
Class of Stock [Line Items]    
Unvested - Number of awards (in shares) 5,296,632 5,005,422
Holdings GP Units | Restricted Stock    
Class of Stock [Line Items]    
Unvested - Number of awards (in shares) 5,186,737  
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 61,425,521 56,429,825
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 5,519,415 7,803,364
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 11,630,164 13,568,665
Common stock votes per share | vote 1