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Stockholders' Equity (Details)
Sep. 30, 2019
vote
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Class of Stock [Line Items]    
Common stock, shares, outstanding 77,802,278 76,942,872
Unvested - Number of awards (in shares) 5,006,649 4,678,457
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 56,261,026  
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 7,853,364 8,645,249
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 13,687,888 14,226,435
Common stock votes per share | vote 1  
Restricted Stock | Holdings GP Units    
Class of Stock [Line Items]    
Unvested - Number of awards (in shares) 4,899,524