STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS - Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	$ 514,190	$ 415,885	$ 482,187	$ 675,399
Other comprehensive income (loss) before reclassifications	32,594	(14,881)	13,364	(3,278)
Adjustments for items reclassified to earnings, net of tax	1,888	3,709	4,775	6,073
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	34,482	(11,172)	18,139	2,795
Balance at the end	679,988	419,561	679,988	419,561
Currency Translation Adjustments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	(144,825)	(139,907)	(123,991)	(156,924)
Other comprehensive income (loss) before reclassifications	41,627	(19,935)	20,793	(2,946)
Adjustments for items reclassified to earnings, net of tax	0	2,129	0	2,157
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	41,627	(17,806)	20,793	(789)
Balance at the end	(103,198)	(157,713)	(103,198)	(157,713)
Employee Benefit Plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	(161,467)	(141,980)	(165,958)	(138,930)
Other comprehensive income (loss) before reclassifications	(9,033)	5,054	(7,429)	(332)
Adjustments for items reclassified to earnings, net of tax	1,888	1,580	4,775	3,916
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(7,145)	6,634	(2,654)	3,584
Balance at the end	(168,612)	(135,346)	(168,612)	(135,346)
Total AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	(306,292)	(281,887)	(289,949)	(295,854)
Balance at the end	(271,810)	(293,059)	(271,810)	(293,059)
Amount Attributable to Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	1	(1)	1	0
Other comprehensive income (loss) before reclassifications	33	1	33	0
Adjustments for items reclassified to earnings, net of tax	0	0	0	0
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	33	1	33	0
Balance at the end	34	0	34	0
Total Lazard, Inc. AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning	(306,293)	(281,886)	(289,950)	(295,854)
Other comprehensive income (loss) before reclassifications	32,561	(14,882)	13,331	(3,278)
Adjustments for items reclassified to earnings, net of tax	1,888	3,709	4,775	6,073
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	34,449	(11,173)	18,106	2,795
Balance at the end	$ (271,844)	$ (293,059)	$ (271,844)	$ (293,059)