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INVESTMENTS - Investments and Securities Sold, not yet Purchased (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Investments $ 657,880 $ 698,977
Investments, at fair value 657,880 683,496
Equity method investments 0 15,481
Debt    
Schedule of Investments [Line Items]    
Investments 4,481 0
Equities    
Schedule of Investments [Line Items]    
Investments 40,659 43,889
Funds Total    
Schedule of Investments [Line Items]    
Investments 612,740 639,607
Alternative investments    
Schedule of Investments [Line Items]    
Investments 60,210 56,947
Alternative investments | Lazard Fund Interests | Lazard Group LLC    
Schedule of Investments [Line Items]    
Investments 27,145 24,137
Debt    
Schedule of Investments [Line Items]    
Investments 183,790 178,556
Debt | Lazard Fund Interests | Lazard Group LLC    
Schedule of Investments [Line Items]    
Investments 168,624 142,632
Equity    
Schedule of Investments [Line Items]    
Investments 324,239 350,282
Equity | Lazard Fund Interests | Lazard Group LLC    
Schedule of Investments [Line Items]    
Investments 262,223 266,528
Private equity    
Schedule of Investments [Line Items]    
Investments $ 44,501 $ 53,822