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INVESTMENTS - Investments and Securities Sold, Not Yet Purchased (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Investments $ 690,199 $ 698,977
Investments, at fair value 690,199 683,496
Equity method investments 0 15,481
Securities sold, not yet purchased, at fair value (included in “other liabilities”) 1,550 4,651
Debt    
Schedule of Investments [Line Items]    
Investments 5,022 0
Equities    
Schedule of Investments [Line Items]    
Investments 44,603 43,889
Funds Total    
Schedule of Investments [Line Items]    
Investments 640,574 639,607
Alternative investments    
Schedule of Investments [Line Items]    
Investments 59,817 56,947
Alternative investments | Lazard Fund Interests | Lazard Group LLC    
Schedule of Investments [Line Items]    
Investments 27,181 24,137
Debt    
Schedule of Investments [Line Items]    
Investments 183,352 178,556
Debt | Lazard Fund Interests | Lazard Group LLC    
Schedule of Investments [Line Items]    
Investments 167,889 142,632
Equity    
Schedule of Investments [Line Items]    
Investments 354,223 350,282
Equity | Lazard Fund Interests | Lazard Group LLC    
Schedule of Investments [Line Items]    
Investments 288,098 266,528
Private equity    
Schedule of Investments [Line Items]    
Investments $ 43,182 $ 53,822