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SENIOR DEBT - Senior Debt (Details) - USD ($)
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Principal $ 1,700,000,000 $ 1,700,000,000
Unamortized Debt Costs 10,421,000 12,286,000
Carrying Value 1,689,579,000 1,687,714,000
Lazard Group 2025 Senior Notes    
Debt Instrument [Line Items]    
Initial Principal Amount $ 400,000,000  
Maturity Date Feb. 13, 2025  
Annual interest rate 3.75%  
Principal $ 400,000,000 400,000,000
Unamortized Debt Costs 649,000 1,003,000
Carrying Value $ 399,351,000 398,997,000
Effective interest rates of senior notes 3.87%  
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%  
Principal $ 300,000,000 300,000,000
Unamortized Debt Costs 1,333,000 1,625,000
Carrying Value $ 298,667,000 298,375,000
Effective interest rates of senior notes 3.76%  
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%  
Principal $ 500,000,000 500,000,000
Unamortized Debt Costs 4,225,000 4,864,000
Carrying Value $ 495,775,000 495,136,000
Effective interest rates of senior notes 4.67%  
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%  
Principal $ 500,000,000 500,000,000
Unamortized Debt Costs 4,214,000 4,794,000
Carrying Value $ 495,786,000 $ 495,206,000
Effective interest rates of senior notes 4.53%