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	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income attributable to Lazard Ltd	$ (22,172)	$ 113,876
Add - adjustment for earnings attributable to participating securities	(1,125)	(1,733)
Net income attributable to Lazard Ltd - basic	(23,297)	112,143
Add - adjustment for earnings attributable to participating securities		1,129
Net income attributable to Lazard Ltd - diluted	$ (23,297)	$ 113,272
Weighted average number of shares of common stock outstanding	85,734,443	100,634,720
Add - adjustment for shares of common stock issuable on a non-contingent basis	1,857,409	1,912,557
Weighted average number of shares of common stock outstanding - basic	87,591,852	102,547,277
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation		5,639,365
Weighted average number of shares of common stock outstanding - diluted	87,591,852	108,186,642
Net income attributable to Lazard Ltd per share of common stock:
Basic	$ (0.27)	$ 1.09
Diluted	$ (0.27)	$ 1.05