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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended 57 Months Ended
Apr. 30, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2018
Dec. 31, 2015
Mar. 31, 2015
Nov. 09, 2014
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               $ 25,000  
Value of remaining shares authorized for repurchase   $ 13,000       $ 13,000      
Partnership Units                  
Equity-Based Compensation                  
Compensation expenses   1,123 $ 2,137 $ 3,132          
Unrecognized compensation expenses   $ 250       $ 250      
Weighted average period to recognize unrecognized compensation expense   4 months 24 days              
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   163,082       163,082      
RSUs                  
Equity-Based Compensation                  
Compensation expenses   $ 120,012 $ 91,598 $ 70,303          
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   8,761,224 9,357,999 8,504,190   8,761,224 5,123,481    
Unrecognized compensation expenses   $ 114,395       $ 114,395      
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   $ 1,902 $ 2,560 $ 3,615          
Unrecognized compensation expenses   $ 630       $ 630      
Grants (in shares) 3,501,881                
Special dividends paid (in dollars per share)           $ 7.05      
Reduction to exercise price of options outstanding due to special dividend paid (in dollars per share)           7.05      
Exercise price (in dollars per share)   $ 17.95 $ 17.95 $ 17.95   $ 17.95 $ 17.95   $ 25.00
Weighted average remaining period for recognition of unrecognized compensation cost   3 months 18 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