INVESTMENTS - Investments and Securities Sold, not yet Purchased (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Investments	$ 506,497	$ 614,947
Investments, at fair value	488,917	598,048
Equity method investments	17,580	16,899
Debt
Schedule of Investments [Line Items]
Investments	3,759	0
Equity
Schedule of Investments [Line Items]
Investments	49,396	58,623
Total funds
Schedule of Investments [Line Items]
Investments	435,762	539,425
Alternative investments
Schedule of Investments [Line Items]
Investments	50,340	59,230
Alternative investments | Lazard Fund Interests
Schedule of Investments [Line Items]
Investments	20,937	23,865
Debt
Schedule of Investments [Line Items]
Investments	111,751	147,173
Debt | Lazard Fund Interests
Schedule of Investments [Line Items]
Investments	90,688	126,407
Equity
Schedule of Investments [Line Items]
Investments	227,384	289,610
Equity | Lazard Fund Interests
Schedule of Investments [Line Items]
Investments	166,160	223,729
Private equity
Schedule of Investments [Line Items]
Investments	$ 46,287	$ 43,412