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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income (loss) attributable to Lazard	$ 49,909	$ (124,013)	$ 85,664	$ (146,185)
Adjustment for earnings attributable to participating securities	(873)	(763)	(2,152)	(1,888)
Net income (loss) attributable to Lazard - basic	49,036	(124,776)	83,512	(148,073)
Adjustment for earnings attributable to participating securities	206	0	401	0
Net income (loss) attributable to Lazard - diluted	$ 49,242	$ (124,776)	$ 83,913	$ (148,073)
Weighted average number of shares of common stock outstanding (in shares)	90,172,325	86,787,954	89,360,041	86,261,198
Weighted average number of shares of common stock issuable on a non-contingent basis (in shares)	2,714,039	1,941,700	2,713,373	1,899,555
Weighted average number of shares of common stock outstanding - basic (in shares)	92,886,364	88,729,654	92,073,414	88,160,753
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation (in shares)	7,741,503	0	7,916,403	0
Weighted average number of shares of common stock outstanding - diluted (in shares)	100,627,867	88,729,654	99,989,817	88,160,753
Net income (loss) attributable to Lazard per share of common stock:
Basic (in USD per share)	$ 0.53	$ (1.41)	$ 0.91	$ (1.68)
Diluted (in USD per share)	$ 0.49	$ (1.41)	$ 0.84	$ (1.68)
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		1,698,271
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)		3,427,886		4,737,193