CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS (UNAUDITED) - USD ($) $ in Thousands	Total	Total Lazard Stockholders’ Equity	Common Stock	Additional Paid-In- Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net of Tax	Common Stock Held By Subsidiaries	Noncontrolling Interests	Redeemable Noncontrolling Interests
Balance at the beginning (in shares) at Dec. 31, 2022			112,766,091				26,814,213
Balance at the beginning at Dec. 31, 2022	$ 675,399	$ 556,463	$ 1,128	$ 167,890	$ 1,676,713	$ (295,854)	$ (993,414)	$ 118,936
Comprehensive income (loss):
Net income	(134,350)	(139,046)			(139,046)			4,696
Other comprehensive income (loss) - net of tax	2,795	2,795				2,795		0
Amortization of share-based incentive compensation	209,630	204,641		204,641				4,989
Dividend equivalents	(9,334)	(698)		19,094	(19,792)			(8,636)
Common stock dividends	$ (129,367)	(129,367)			(129,367)
Purchase of common stock (in shares)	2,782,662						2,782,662
Purchase of common stock	$ (102,051)	(102,051)					$ (102,051)
Delivery of common stock in connection with share-based incentive compensation and related tax expense (benefit) (in shares)							(4,203,791)
Delivery of common stock in connection with share-based incentive compensation and related tax expense (benefit)	(53,670)	(59,334)		(215,539)			$ 156,205	5,664
Business acquisitions and related equity transactions: Common stock issuable	1,775	1,775		1,775
Delivery of common stock (in shares)							(41,384)
Delivery of common stock	0	0		(1,533)			$ 1,533
Distributions to noncontrolling interests, net	(3,820)							(3,820)
LFI Consolidated Funds	(74,164)							(74,164)
Change in redemption value of redeemable noncontrolling interests	(589)	(412)		(412)				(177)
Reversal to net loss of amounts previously charged to additional paid-in-capital and noncontrolling interests	17,929	13,195		13,195				4,734
Reversal of deferred offering costs liability	20,125	14,087		14,087				6,038
Other (in shares)							5,240
Other	(747)	(730)		(581)			$ (149)	(17)
Balance at the end (in shares) at Sep. 30, 2023			112,766,091				25,356,940
Balance at the end at Sep. 30, 2023	419,561	361,318	$ 1,128	202,617	1,388,508	(293,059)	$ (937,876)	58,243
Balance at the beginning at Dec. 31, 2022									$ 583,471
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income									5,549
LFI Consolidated Funds									78,063
Change in redemption value of redeemable noncontrolling interests									589
Distribution to redeemable noncontrolling interests									(585,891)
Balance at the end at Sep. 30, 2023									81,781
Balance at the beginning (in shares) at Jun. 30, 2023			112,766,091				25,896,701
Balance at the beginning at Jun. 30, 2023	415,885	359,978	$ 1,128	167,622	1,431,181	(281,886)	$ (958,067)	55,907
Comprehensive income (loss):
Net income	10,025	7,139			7,139			2,886
Other comprehensive income (loss) - net of tax	(11,172)	(11,173)				(11,173)		1
Amortization of share-based incentive compensation	58,362	57,058		57,058				1,304
Dividend equivalents	(2,153)	(237)		6,133	(6,370)			(1,916)
Common stock dividends	(43,442)	(43,442)			(43,442)
Purchase of common stock (in shares)							85,035
Purchase of common stock	(2,954)	(2,954)					$ (2,954)
Delivery of common stock in connection with share-based incentive compensation and related tax expense (benefit) (in shares)							(624,796)
Delivery of common stock in connection with share-based incentive compensation and related tax expense (benefit)	(5,051)	(5,051)		(28,196)			$ 23,145
Contributions from noncontrolling interests, net	61	0						61
Balance at the end (in shares) at Sep. 30, 2023			112,766,091				25,356,940
Balance at the end at Sep. 30, 2023	419,561	361,318	$ 1,128	202,617	1,388,508	(293,059)	$ (937,876)	58,243
Balance at the beginning at Jun. 30, 2023									83,583
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income									(3,251)
LFI Consolidated Funds									1,449
Balance at the end at Sep. 30, 2023									81,781
Balance at the beginning (in shares) at Dec. 31, 2023			112,766,091				25,340,287
Balance at the beginning at Dec. 31, 2023	482,187	423,759	$ 1,128	247,204	1,402,636	(289,950)	$ (937,259)	58,428
Comprehensive income (loss):
Net income	199,757	193,602			193,602			6,155
Other comprehensive income (loss) - net of tax	18,139	18,106				18,106		33
Amortization of share-based incentive compensation	235,129	232,998		232,998				2,131
Dividend equivalents	(11,107)	(821)		23,896	(24,717)			(10,286)
Common stock dividends	$ (133,823)	(133,823)			(133,823)
Purchase of common stock (in shares)	1,123,413						1,123,413
Purchase of common stock	$ (43,928)	(43,928)					$ (43,928)
Delivery of common stock in connection with share-based incentive compensation and related tax expense (benefit) (in shares)							(4,167,528)
Delivery of common stock in connection with share-based incentive compensation and related tax expense (benefit)	(65,608)	(66,849)		(221,242)			$ 154,393	1,241
Business acquisitions and related equity transactions: Common stock issuable	1,235	1,235		1,235
Distributions to noncontrolling interests, net	(1,987)	0						(1,987)
Other (in shares)							144
Other	(6)	(6)					$ (6)
Balance at the end (in shares) at Sep. 30, 2024			112,766,091				22,296,316
Balance at the end at Sep. 30, 2024	679,988	624,273	$ 1,128	284,091	1,437,698	(271,844)	$ (826,800)	55,715
Balance at the beginning at Dec. 31, 2023									87,675
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income									8,655
LFI Consolidated Funds									(11,863)
Balance at the end at Sep. 30, 2024									84,467
Balance at the beginning (in shares) at Jun. 30, 2024			112,766,091				22,596,555
Balance at the beginning at Jun. 30, 2024	514,190	458,655	$ 1,128	218,455	1,382,703	(306,293)	$ (837,338)	55,535
Comprehensive income (loss):
Net income	110,558	107,938			107,938			2,620
Other comprehensive income (loss) - net of tax	34,482	34,449				34,449		33
Amortization of share-based incentive compensation	75,584	74,787		74,787				797
Dividend equivalents	(3,274)	(218)		7,633	(7,851)			(3,056)
Common stock dividends	(45,092)	(45,092)			(45,092)
Purchase of common stock (in shares)							67,500
Purchase of common stock	(3,112)	(3,112)					$ (3,112)
Delivery of common stock in connection with share-based incentive compensation and related tax expense (benefit) (in shares)							(367,739)
Delivery of common stock in connection with share-based incentive compensation and related tax expense (benefit)	(3,134)	(3,134)		(16,784)			$ 13,650
Distributions to noncontrolling interests, net	(214)							(214)
Balance at the end (in shares) at Sep. 30, 2024			112,766,091				22,296,316
Balance at the end at Sep. 30, 2024	$ 679,988	$ 624,273	$ 1,128	$ 284,091	$ 1,437,698	$ (271,844)	$ (826,800)	$ 55,715
Balance at the beginning at Jun. 30, 2024									80,931
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income									5,577
LFI Consolidated Funds									(2,041)
Balance at the end at Sep. 30, 2024									$ 84,467