NET INCOME (LOSS) PER SHARE OF COMMON STOCK - Schedule of Company's Basic and Diluted Net Income Per Share and Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income (loss) attributable to Lazard	$ 107,938	$ 7,139	$ 193,602	$ (139,046)
Adjustment for earnings attributable to participating securities	(2,579)	(1,029)	(4,732)	(2,917)
Net income (loss) attributable to Lazard - basic	105,359	6,110	188,870	(141,963)
Adjustment for earnings attributable to participating securities	463	0	864	0
Net income (loss) attributable to Lazard - diluted	$ 105,822	$ 6,110	$ 189,734	$ (141,963)
Weighted average number of shares of common stock outstanding (in shares)	90,276,294	87,067,104	89,665,458	86,529,833
Weighted average number of shares of common stock issuable on a non-contingent basis (in shares)	3,351,182	2,358,796	2,925,977	2,052,635
Weighted average number of shares of common stock outstanding - basic (in shares)	93,627,476	89,425,900	92,591,435	88,582,468
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation (in shares)	9,847,758	4,883,324	8,560,189	0
Weighted average number of shares of common stock outstanding - diluted (in shares)	103,475,234	94,309,224	101,151,624	88,582,468
Net income (loss) attributable to Lazard per share of common stock:
Basic (in USD per share)	$ 1.13	$ 0.07	$ 2.04	$ (1.60)
Diluted (in USD per share)	$ 1.02	$ 0.06	$ 1.88	$ (1.60)
Weighted Average | PIPRs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares excluded from calculation (in shares)	1,229,021		1,541,854
Weighted Average | RSUs, PRSUs and PIPRs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares excluded from calculation (in shares)				4,785,903