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Investments - Investments and Securities Sold, not yet Purchased (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Investments $ 614,947 $ 701,964
Investments, at fair value 598,048 701,964
Equity method investments 16,899 0
Debt    
Schedule of Investments [Line Items]    
Investments 0 4,285
Equity    
Schedule of Investments [Line Items]    
Investments 58,623 54,717
Funds:    
Schedule of Investments [Line Items]    
Investments 539,425 642,962
Alternative investments    
Schedule of Investments [Line Items]    
Investments 59,230 61,680
Alternative investments | Lazard Fund Interests    
Schedule of Investments [Line Items]    
Investments 23,865 27,454
Debt    
Schedule of Investments [Line Items]    
Investments 147,173 191,325
Debt | Lazard Fund Interests    
Schedule of Investments [Line Items]    
Investments 126,407 175,449
Equity    
Schedule of Investments [Line Items]    
Investments 289,610 343,139
Equity | Lazard Fund Interests    
Schedule of Investments [Line Items]    
Investments 223,729 284,099
Private equity    
Schedule of Investments [Line Items]    
Investments $ 43,412 $ 46,818