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Concentrations of Credit Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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, Net of Allowance $ 351,668 $ 368,346  
Contract with Customer, Receivable, Net, Noncurrent 87,764 70,975 $ 63,554
Bad Debt Expense (60) 6,878 10,451
Contract with Customer, Asset, Gross, Current 14,092 29,327 31,525
Contract with Customer, Asset, Gross, Noncurrent 12,945 5,283 $ 2,504
Investment Securities $ 1,643,421 1,060,836  
Percentage Of Marketable Securities Related To U.S. Treasury Bills 91.00%    
Percentage Of Marketable Securities Related To Equity Securities and Exchange Traded Funds 9.00%    
Certificates of Deposit, at Carrying Value $ 141,218 $ 0