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Employee Equity-Based Compensation - Stock Option Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Options Outstanding    
Number of options (shares) 7,524,849 6,857,124
Weighted average remaining contractual term (in years) 6 years 8 months 27 days  
Weighted average exercise price (dollars per share) $ 9.48 $ 7.72
Weighted average fair value (dollars per share) $ 7.09  
Aggregate intrinsic value (in thousands) $ 98,899  
Options Exercisable    
Number of options (shares) 4,953,299  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 9 months 15 days  
Weighted average exercise price (dollars per share) $ 5.41  
Weighted average fair value (dollars per share) $ 4.12  
Aggregate intrinsic value (in thousands) $ 92,772