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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]      
Fees receivable $ 136,541   $ 111,784
Due from related parties 30,400   34,814
Redeemable non-controlling interests, Related Party 392,326   440,604
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds (11,156) $ (9,105)  
Employees      
Related Party Transaction [Line Items]      
Redeemable non-controlling interests, Related Party 21,700   28,200
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds (2,900) (1,900)  
Employee Loans      
Related Party Transaction [Line Items]      
Due from employees 12,100   11,100
Forgivable Loan Balances 6,800   4,800
Amortization on Forgivable Loans $ 600 $ 400  
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 $ 17,700   13,500
Investor      
Related Party Transaction [Line Items]      
Due to Affiliate 600   600
Other Funds      
Related Party Transaction [Line Items]      
Due from related parties 9,900   9,700
Starboard Value LP      
Related Party Transaction [Line Items]      
Effective interest rate   5.00%  
Interest Income, Related Party 100 $ 200  
Due from related parties $ 8,300   $ 14,000
Finance Period 5 years