Net Income Per Share of Common Stock - Company's Basic and Diluted Net Income Per Share and Weighted Average Shares Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income attributable to Lazard Ltd	$ 357,517	$ 528,064	$ 402,461
Add - adjustment for earnings attributable to participating securities	(5,732)	(8,647)	(7,667)
Net income attributable to Lazard Ltd - basic	351,785	519,417	394,794
Add - adjustment for earnings attributable to participating securities	2,641	7,068	6,429
Net income attributable to Lazard Ltd - diluted	$ 354,426	$ 526,485	$ 401,223
Weighted average number of shares of common stock outstanding	93,994,663	104,166,347	104,803,849
Add - adjustment for shares of common stock issuable on a non-contingent basis	1,669,466	1,869,461	2,058,890
Weighted average number of shares of common stock outstanding - basic	95,664,129	106,035,808	106,862,739
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation	5,333,545	7,638,891	6,620,641
Weighted average number of shares of common stock outstanding - diluted	100,997,674	113,674,699	113,483,380
Net income attributable to Lazard Ltd per share of common stock:
Basic	$ 3.68	$ 4.90	$ 3.69
Diluted	$ 3.51	$ 4.63	$ 3.54