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Concentrations of Credit Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Risks and Uncertainties [Abstract]      
Investment Banking And Investment Management Receivables Collection Periods 90 days    
Placement Fees Receivables Collection Period 180 days    
Private Funds Capital Raising and Private Capital Receivables Collection Period 1 year    
Restructuring Receivables Collection Period 90 days    
Receivables Reflected in Other Assets in Excess of Period 1 year    
Accounts Receivable, after Allowance for Credit Loss $ 421,502 $ 371,606  
Contract with Customer, Receivable, Net, Noncurrent 101,314 93,689 $ 64,139
Bad Debt Expense 2,334 5,559 5,513
Contract with Customer, Asset, Gross, Current 62,379 85,401 110,468
Contract with Customer, Asset, Gross, Noncurrent 14,477 5,845 $ 8,028
Investment Securities $ 1,452,721 1,382,027  
Percentage Of Marketable Securities Related To U.S. Treasury Bills and Notes 88.00%    
Percentage Of Marketable Securities Related To Equity Securities and Exchange Traded Funds 12.00%    
Certificates of Deposit, at contract value $ 66,660 $ 54,856