INVESTMENTS - Investments and Securities Sold, not yet Purchased (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Investments	$ 688,411	$ 701,964
Investments, at fair value	670,474	701,964
Equity method investments	17,937	0
Debt
Schedule of Investments [Line Items]
Investments	51,101	4,285
Equity
Schedule of Investments [Line Items]
Investments	57,798	54,717
Total funds
Schedule of Investments [Line Items]
Investments	561,575	642,962
Alternative investments
Schedule of Investments [Line Items]
Investments	59,558	61,680
Alternative investments | Lazard Fund Interests
Schedule of Investments [Line Items]
Investments	23,829	27,454
Debt
Schedule of Investments [Line Items]
Investments	150,924	191,325
Debt | Lazard Fund Interests
Schedule of Investments [Line Items]
Investments	133,925	175,449
Equity
Schedule of Investments [Line Items]
Investments	304,736	343,139
Equity | Lazard Fund Interests
Schedule of Investments [Line Items]
Investments	237,687	284,099
Private equity
Schedule of Investments [Line Items]
Investments	$ 46,357	$ 46,818