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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended
Apr. 30, 2014
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2014
Mar. 31, 2019
Feb. 28, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2015
Nov. 09, 2014
Equity-Based Compensation                    
Compensation expenses   $ 38,282 $ 31,180              
Class A Common Stock                    
Equity-Based Compensation                    
Number of shares of common stock to be issued upon exchange of a partnership unit   1     1          
Share value authorized for repurchase           $ 100,000     $ 25,000  
Value of remaining shares authorized for repurchase   $ 100,000     $ 100,000          
Partnership and Employees                    
Equity-Based Compensation                    
Units held by partners and employees   13,053,465     13,053,465          
Unvested units held by partners and employees   96,138     96,138          
Class A Partnership Units                    
Equity-Based Compensation                    
Compensation expenses   $ 109 $ 459              
Unrecognized compensation expenses   $ 141     $ 141          
Weighted average period to recognize unrecognized compensation expense   4 months 24 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   9,455,588 9,830,340   9,455,588   8,761,224 9,357,999    
Unrecognized compensation expenses   $ 208,908     $ 208,908          
Weighted average period to recognize unrecognized compensation expense   2 years                
Stock Options                    
Equity-Based Compensation                    
Vesting period       5 years            
Compensation expenses   $ 495 $ 605              
Unrecognized compensation expenses   $ 122     $ 122          
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
Weighted average remaining period for recognition of unrecognized compensation cost   1 month 6 days                
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