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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 63 Months Ended
Apr. 30, 2014
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2014
Jun. 30, 2019
Feb. 28, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2015
Nov. 09, 2014
Equity-Based Compensation                        
Compensation expenses   $ 28,094 $ 25,553 $ 66,376 $ 56,733              
Class A Common Stock                        
Equity-Based Compensation                        
Number of shares of common stock to be issued upon exchange of a partnership unit   1   1     1          
Share value authorized for repurchase               $ 100,000     $ 25,000  
Value of remaining shares authorized for repurchase   $ 95,000   $ 95,000     $ 95,000          
Partnership and Employees                        
Equity-Based Compensation                        
Units held by partners and employees   12,991,529   12,991,529     12,991,529          
Unvested units held by partners and employees   48,084   48,084     48,084          
Class A Partnership Units                        
Equity-Based Compensation                        
Compensation expenses   $ 41 $ 243 $ 150 $ 702              
Unrecognized compensation expenses   $ 100   $ 100     $ 100          
Weighted average period to recognize unrecognized compensation expense       7 months 6 days                
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   8,521,695 9,220,346 8,521,695 9,220,346   8,521,695   8,761,224 9,357,999    
Unrecognized compensation expenses   $ 175,164   $ 175,164     $ 175,164          
Weighted average period to recognize unrecognized compensation expense       1 year 9 months 18 days                
Stock Options                        
Equity-Based Compensation                        
Vesting period           5 years            
Compensation expenses   $ 111 $ 295 $ 606 $ 900              
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   $ 16.70 $ 16.70   $ 25.00
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