SENIOR DEBT - Senior Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Principal	$ 1,700,000,000	$ 1,700,000,000
Unamortized Debt Costs	12,159,000	12,948,000
Carrying Value	1,687,841,000	1,687,052,000
Lazard Group 2027 Senior Notes
Debt Instrument [Line Items]
Initial Principal Amount	$ 300,000,000
Maturity Date	Mar. 01, 2027
Annual Interest Rate	3.625%
Effective Interest Rate	3.81%
Principal	$ 300,000,000	300,000,000
Unamortized Debt Costs	1,073,000	1,213,000
Carrying Value	298,927,000	298,787,000
Lazard Group 2028 Senior Notes
Debt Instrument [Line Items]
Initial Principal Amount	$ 500,000,000
Maturity Date	Sep. 19, 2028
Annual Interest Rate	4.50%
Effective Interest Rate	4.70%
Principal	$ 500,000,000	500,000,000
Unamortized Debt Costs	3,528,000	3,783,000
Carrying Value	496,472,000	496,217,000
Lazard Group 2029 Senior Notes
Debt Instrument [Line Items]
Initial Principal Amount	$ 500,000,000
Maturity Date	Mar. 11, 2029
Annual Interest Rate	4.375%
Effective Interest Rate	4.56%
Principal	$ 500,000,000	500,000,000
Unamortized Debt Costs	3,645,000	3,875,000
Carrying Value	496,355,000	496,125,000
Lazard Group 2031 Senior Notes
Debt Instrument [Line Items]
Initial Principal Amount	$ 400,000,000
Maturity Date	Mar. 15, 2031
Annual Interest Rate	6.00%
Effective Interest Rate	6.16%
Principal	$ 400,000,000	400,000,000
Unamortized Debt Costs	3,913,000	4,077,000
Carrying Value	$ 396,087,000	$ 395,923,000