Schedule I - Condensed Statements of Comprehensive Income (Parent Company Only) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
NET INCOME	$ 357,517	$ 528,064	$ 402,461
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Currency translation adjustments before reclassification	(64,778)	(48,099)	52,862
Adjustment for items reclassified to earnings	32	23,645
Employee benefit plans:
Actuarial gain (loss) (net of tax expense (benefit) of $(5,978), $13,263 and $(1,431) for the years ended December 31, 2022, 2021 and 2020, respectively)	(11,413)	33,315	(3,626)
Adjustments for items reclassified to earnings (net of tax expense of $994, $1,609 and $1,476 for the years ended December 31, 2022, 2021 and 2020, respectively)	4,152	5,660	6,046
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(72,007)	14,521	55,282
COMPREHENSIVE INCOME ATTRIBUTABLE TO LAZARD LTD	285,510	542,585	457,741
Parent Company [Member]
NET INCOME	357,517	528,064	402,461
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Currency translation adjustments before reclassification	(64,778)	(48,099)	52,860
Adjustment for items reclassified to earnings	32	23,645
Employee benefit plans:
Actuarial gain (loss) (net of tax expense (benefit) of $(5,978), $13,263 and $(1,431) for the years ended December 31, 2022, 2021 and 2020, respectively)	(11,413)	33,315	(3,626)
Adjustments for items reclassified to earnings (net of tax expense of $994, $1,609 and $1,476 for the years ended December 31, 2022, 2021 and 2020, respectively)	4,152	5,660	6,046
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(72,007)	14,521	55,280
COMPREHENSIVE INCOME ATTRIBUTABLE TO LAZARD LTD	$ 285,510	$ 542,585	$ 457,741