INVESTMENTS - Investments and Securities Sold, not yet Purchased (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Investments	$ 620,615	$ 701,964
Investments, at fair value	620,615	701,964
Lazard Group LLC
Schedule of Investments [Line Items]
Investments	78,135	113,174
Debt
Schedule of Investments [Line Items]
Investments	546	4,285
Equity
Schedule of Investments [Line Items]
Investments	59,148	54,717
Funds Total
Schedule of Investments [Line Items]
Investments	560,921	642,962
Alternative investments
Schedule of Investments [Line Items]
Investments	59,418	61,680
Alternative investments | Lazard Fund Interests | Lazard Group LLC
Schedule of Investments [Line Items]
Investments	23,912	27,454
Debt
Schedule of Investments [Line Items]
Investments	156,269	191,325
Debt | Lazard Fund Interests | Lazard Group LLC
Schedule of Investments [Line Items]
Investments	140,132	175,449
Equity
Schedule of Investments [Line Items]
Investments	297,877	343,139
Equity | Lazard Fund Interests | Lazard Group LLC
Schedule of Investments [Line Items]
Investments	235,299	284,099
Private equity
Schedule of Investments [Line Items]
Investments	$ 47,357	$ 46,818