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Concentrations of Credit Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
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 $ 555,812 $ 421,502  
Contract with Customer, Receivable, Net, Noncurrent 129,853 101,314 $ 93,689
Bad Debt Expense 5,635 2,334 5,559
Contract with Customer, Asset, Gross, Current 147,444 62,379 85,401
Contract with Customer, Asset, Gross, Noncurrent 27,905 14,477 $ 5,845
Investment Securities $ 1,540,217 1,452,721  
Percentage Of Marketable Securities Related To U.S. Treasury Bills and Notes 89.00%    
Percentage Of Marketable Securities Related To Equity Securities and Exchange Traded Funds 11.00%    
Certificates of Deposit, at contract value $ 40,421 $ 66,660