Investments - Investments and Securities Sold, not yet Purchased (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Investments	$ 701,964	$ 698,977
Investments, at fair value	701,964	683,496
Equity method investments	0	15,481
Lazard Group LLC
Schedule of Investments [Line Items]
Investments	113,174	115,666
Debt
Schedule of Investments [Line Items]
Investments	4,285	0
Equities
Schedule of Investments [Line Items]
Investments	54,717	43,889
Funds:
Schedule of Investments [Line Items]
Investments	642,962	639,607
Alternative investments funds
Schedule of Investments [Line Items]
Investments	61,680	56,947
Alternative investments funds | Lazard Fund Interests | Lazard Group LLC
Schedule of Investments [Line Items]
Investments	27,454	24,137
Debt funds
Schedule of Investments [Line Items]
Investments	191,325	178,556
Debt funds | Lazard Fund Interests | Lazard Group LLC
Schedule of Investments [Line Items]
Investments	175,449	142,632
Equity funds
Schedule of Investments [Line Items]
Investments	343,139	350,282
Equity funds | Lazard Fund Interests | Lazard Group LLC
Schedule of Investments [Line Items]
Investments	284,099	266,528
Private equity
Schedule of Investments [Line Items]
Investments	$ 46,818	$ 53,822