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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]      
Fees receivable $ 208,898   $ 160,349
Interest Income, Related Party 100 $ 100  
Due from related parties 20,921   21,068
Redeemable non-controlling interests, Related Party 0   0
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries and investment funds 0 (60,990)  
Employees      
Related Party Transaction [Line Items]      
Redeemable non-controlling interests, Related Party 34,800   84,300
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries and investment funds 10,100 100  
Employee Loans      
Related Party Transaction [Line Items]      
Due from employees 11,300   9,500
Forgivable Loan Balances 6,700   4,600
Amortization on Forgivable Loans $ 1,200 $ 1,100  
Employee Loans | Minimum      
Related Party Transaction [Line Items]      
Forgivable Loans, Vesting Period 1 year    
Employee Loans | Maximum      
Related Party Transaction [Line Items]      
Forgivable Loans, Vesting Period 3 years    
Affiliated Entity      
Related Party Transaction [Line Items]      
Fees receivable $ 29,300   28,400
Investor      
Related Party Transaction [Line Items]      
Due to Affiliate 200   200
Other Funds      
Related Party Transaction [Line Items]      
Due from related parties $ 9,600   7,900
Starboard Value LP      
Related Party Transaction [Line Items]      
Effective interest rate   5.00%  
Interest Income, Related Party   $ 100  
Due from related parties     $ 3,600
Finance Period 5 years