NET INCOME 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
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Net income attributable to Lazard	$ 60,375	$ 35,755
Adjustment for earnings attributable to participating securities	(1,810)	(1,279)
Net income attributable to Lazard - basic	58,565	34,476
Adjustment for earnings attributable to participating securities	0	195
Net income attributable to Lazard - diluted	$ 58,565	$ 34,671
Weighted average number of shares of common stock outstanding (in shares)	91,311,188	88,547,757
Weighted average number of shares of common stock issuable on a non-contingent basis (in shares)	3,944,235	2,712,708
Weighted average number of shares of common stock outstanding - basic (in shares)	95,255,423	91,260,465
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation (in shares)	9,573,330	8,091,304
Weighted average number of shares of common stock outstanding - diluted (in shares)	104,828,753	99,351,769
Net income attributable to Lazard per share of common stock:
Basic (in USD per share)	$ 0.61	$ 0.38
Diluted (in USD per share)	$ 0.56	$ 0.35
Weighted Average | PIPRs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares excluded from calculation (in shares)	2,814,720	2,167,520