Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUE
Interest income	$ 1,059	$ 3,962	$ 4,811	$ 11,775
Other	26,402	14,668	56,634	65,537
Total revenue	598,022	611,073	1,748,443	1,923,552
Interest expense	20,344	20,005	60,459	58,120
Net revenue	577,678	591,068	1,687,984	1,865,432
OPERATING EXPENSES
Compensation and benefits	354,625	391,363	1,025,948	1,136,087
Occupancy and equipment	31,318	29,856	94,090	89,104
Marketing and business development	7,562	27,318	34,265	84,086
Technology and information services	33,457	34,076	97,444	104,956
Professional services	14,701	15,105	45,974	48,466
Fund administration and outsourced services	26,196	28,425	76,639	85,848
Amortization and other acquisition-related costs	458	1,022	1,359	9,534
Other	4,681	11,530	27,623	33,630
Total operating expenses	472,998	538,695	1,403,342	1,591,711
OPERATING INCOME	104,680	52,373	284,642	273,721
Provision for income taxes	28,165	4,177	76,720	55,536
NET INCOME	76,515	48,196	207,922	218,185
LESS - NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1,423	1,492	(4,650)	8,662
NET INCOME ATTRIBUTABLE TO LAZARD LTD	$ 75,092	$ 46,704	$ 212,572	$ 209,523
WEIGHTED AVERAGE SHARES OF COMMON STOCK OUTSTANDING:
Basic	107,168,615	109,285,727	106,711,547	111,070,395
Diluted	113,181,564	113,881,690	112,929,830	116,959,041
NET INCOME PER SHARE OF COMMON STOCK:
Basic	$ 0.69	$ 0.42	$ 1.96	$ 1.87
Diluted	$ 0.66	$ 0.40	$ 1.88	$ 1.77
Investment Banking and Other Advisory Fees [Member]
REVENUE
Revenue	$ 304,999	$ 305,303	$ 906,927	$ 970,081
Asset Management Fees [Member]
REVENUE
Revenue	$ 265,562	$ 287,140	$ 780,071	$ 876,159