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SENIOR DEBT - Senior Debt (Details) - USD ($)
 1 Months Ended 3 Months Ended
Mar. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]      
Principal $ 1,864,347,000 $ 1,864,347,000 $ 1,700,000,000
Unamortized Debt Costs 12,903,000 12,903,000 9,800,000
Carrying Value 1,851,444,000 1,851,444,000 1,690,200,000
Lazard Group 2025 Senior Notes      
Debt Instrument [Line Items]      
Initial Principal Amount $ 400,000,000 $ 400,000,000  
Maturity Date   Feb. 13, 2025  
Annual interest rate 3.75% 3.75%  
Principal $ 164,347,000 $ 164,347,000 400,000,000
Unamortized Debt Costs 170,000 170,000 531,000
Carrying Value 164,177,000 $ 164,177,000 399,469,000
Aggregate principal amount of debt purchased $ 235,653,000    
Effective interest rates of senior notes 3.79% 3.79%  
Lazard Group 2027 Senior Notes      
Debt Instrument [Line Items]      
Initial Principal Amount $ 300,000,000 $ 300,000,000  
Maturity Date   Mar. 01, 2027  
Annual interest rate 3.625% 3.625%  
Principal $ 300,000,000 $ 300,000,000 300,000,000
Unamortized Debt Costs 1,138,000 1,138,000 1,235,000
Carrying Value $ 298,862,000 $ 298,862,000 298,765,000
Effective interest rates of senior notes 3.76% 3.76%  
Lazard Group 2028 Senior Notes      
Debt Instrument [Line Items]      
Initial Principal Amount $ 500,000,000 $ 500,000,000  
Maturity Date   Sep. 19, 2028  
Annual interest rate 4.50% 4.50%  
Principal $ 500,000,000 $ 500,000,000 500,000,000
Unamortized Debt Costs 3,799,000 3,799,000 4,012,000
Carrying Value $ 496,201,000 $ 496,201,000 495,988,000
Effective interest rates of senior notes 4.67% 4.67%  
Lazard Group 2029 Senior Notes      
Debt Instrument [Line Items]      
Initial Principal Amount $ 500,000,000 $ 500,000,000  
Maturity Date   Mar. 11, 2029  
Annual interest rate 4.375% 4.375%  
Principal $ 500,000,000 $ 500,000,000 500,000,000
Unamortized Debt Costs 3,828,000 3,828,000 4,022,000
Carrying Value $ 496,172,000 $ 496,172,000 $ 495,978,000
Effective interest rates of senior notes 4.53% 4.53%  
Lazard Group 2031 Senior Notes      
Debt Instrument [Line Items]      
Initial Principal Amount $ 400,000,000 $ 400,000,000  
Maturity Date   Mar. 15, 2031  
Annual interest rate 6.00% 6.00%  
Principal $ 400,000,000 $ 400,000,000  
Unamortized Debt Costs 3,968,000 3,968,000  
Carrying Value $ 396,032,000 $ 396,032,000  
Effective interest rates of senior notes 6.14% 6.14%