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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended 69 Months Ended
Apr. 30, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2014
Dec. 31, 2019
Feb. 28, 2019
Dec. 31, 2016
Mar. 31, 2015
Nov. 09, 2014
Equity-Based Compensation                    
Compensation expenses   $ 123,395 $ 120,012 $ 91,598            
Class A Common Stock                    
Equity-Based Compensation                    
Number of shares of common stock to be issued upon exchange of a partnership unit   1       1        
Partnership Units                    
Equity-Based Compensation                    
Compensation expenses   $ 211 $ 1,123 $ 2,137            
Unrecognized compensation expenses   $ 39       $ 39        
Weighted average period to recognize unrecognized compensation expense   3 months 18 days                
Partnership and Employees                    
Equity-Based Compensation                    
Units held by partners and employees   12,958,022       12,958,022        
Unvested units held by partners and employees   36,634       36,634        
Share Repurchase Plan | Class A Common Stock                    
Equity-Based Compensation                    
Share value authorized for repurchase             $ 100,000   $ 25,000  
Value of remaining shares authorized for repurchase   $ 86,400       $ 86,400        
RSUs | Minimum                    
Equity-Based Compensation                    
Vesting period   4 years                
RSUs | Maximum                    
Equity-Based Compensation                    
Vesting period   5 years                
Restricted Stock and RSUs                    
Equity-Based Compensation                    
Unvested units held by partners and employees   8,414,130 8,761,224 9,357,999   8,414,130   8,504,190    
Unrecognized compensation expenses   $ 124,064       $ 124,064        
Weighted average period to recognize unrecognized compensation expense   1 year 4 months 24 days                
Stock Options                    
Equity-Based Compensation                    
Vesting period         5 years          
Compensation expenses   $ 606 $ 1,902 $ 2,560            
Grants (in shares) 3,501,881                  
Special dividends paid (in dollars per share)           $ 8.30        
Reduction to exercise price of options outstanding due to special dividend paid (in dollars per share)           8.30        
Exercise price (in dollars per share)   $ 16.70 $ 16.70 $ 16.70   $ 16.70   $ 16.70   $ 25.00
Stock options expiration date   2020-04                
Managing Directors | Partnership Units | Minimum                    
Equity-Based Compensation                    
Vesting period   5 years                
Managing Directors | Partnership Units | Maximum                    
Equity-Based Compensation                    
Vesting period   8 years                
Non-Managing Director Employees | Partnership Units                    
Equity-Based Compensation                    
Vesting period   4 years