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Employee Equity-Based Compensation - Stock Option Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Options Outstanding    
Number of options (shares) 8,083,716 7,328,131
Weighted average remaining contractual term (in years) 6 years 4 months 6 days  
Weighted average exercise price (dollars per share) $ 11.94 $ 10.16
Weighted average fair value (dollars per share) $ 8.46  
Aggregate intrinsic value (in thousands) $ 93,003  
Options Exercisable    
Number of options (shares) 5,667,598  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 3 months 26 days  
Weighted average exercise price (dollars per share) $ 7.86  
Weighted average fair value (dollars per share) $ 5.59  
Aggregate intrinsic value (in thousands) $ 86,184