Schedule I - Condensed Statements of Operations (Parent Company Only) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
REVENUE
Total revenue	$ 3,273,816	$ 2,646,769	$ 2,666,958
OPERATING EXPENSES
Professional services	77,702	66,304	71,852
Other	45,318	38,931	43,951
Total operating expenses	2,469,200	2,063,997	2,194,075
NET INCOME ATTRIBUTABLE TO LAZARD LTD	528,064	402,461	286,500
Parent Company [Member]
REVENUE
Equity in earnings of subsidiaries	410,550	274,461	153,450
Interest and other income	119,412	129,912	135,220
Total revenue	529,962	404,373	288,670
OPERATING EXPENSES
Professional services	1,792	1,851	2,017
Other	106	61	153
Total operating expenses	1,898	1,912	2,170
NET INCOME ATTRIBUTABLE TO LAZARD LTD	$ 528,064	$ 402,461	$ 286,500