STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS - Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	$ 508,409	$ 969,628	$ 675,399	$ 1,077,964
Other comprehensive income (loss) before reclassifications	(107)	(53,413)	11,631	(67,964)
Adjustments for items reclassified to earnings, net of tax	1,176	1,010	2,336	1,781
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	1,069	(52,403)	13,967	(66,183)
Balance at the end	415,885	826,957	415,885	826,957
Currency Translation Adjustments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	(142,385)	(110,246)	(156,924)	(92,178)
Other comprehensive income (loss) before reclassifications	2,478	(61,700)	17,017	(79,690)
Adjustments for items reclassified to earnings, net of tax	0	205	0	127
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	2,478	(61,495)	17,017	(79,563)
Balance at the end	(139,907)	(171,741)	(139,907)	(171,741)
Employee Benefit Plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	(140,571)	(127,381)	(138,930)	(131,669)
Other comprehensive income (loss) before reclassifications	(2,585)	8,287	(5,386)	11,726
Adjustments for items reclassified to earnings, net of tax	1,176	805	2,336	1,654
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(1,409)	9,092	(3,050)	13,380
Balance at the end	(141,980)	(118,289)	(141,980)	(118,289)
Total AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	(282,956)	(237,627)	(295,854)	(223,847)
Balance at the end	(281,887)	(290,030)	(281,887)	(290,030)
Amount Attributable to Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	1	(1)	0	0
Other comprehensive income (loss) before reclassifications	(2)	0	(1)	(1)
Adjustments for items reclassified to earnings, net of tax	0	0	0	0
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(2)	0	(1)	(1)
Balance at the end	(1)	(1)	(1)	(1)
Total Lazard Ltd AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	(282,957)	(237,626)	(295,854)	(223,847)
Other comprehensive income (loss) before reclassifications	(105)	(53,413)	11,632	(67,963)
Adjustments for items reclassified to earnings, net of tax	1,176	1,010	2,336	1,781
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	1,071	(52,403)	13,968	(66,182)
Balance at the end	$ (281,886)	$ (290,029)	$ (281,886)	$ (290,029)