v3.25.2
SENIOR DEBT - Senior Debt (Details) - USD ($)
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Principal $ 1,700,000,000 $ 1,700,000,000
Unamortized Debt Costs 11,369,000 12,948,000
Carrying Value 1,688,631,000 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 934,000 1,213,000
Carrying Value 299,066,000 298,787,000
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 3,273,000 3,783,000
Carrying Value 496,727,000 496,217,000
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 3,414,000 3,875,000
Carrying Value 496,586,000 496,125,000
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 3,748,000 4,077,000
Carrying Value $ 396,252,000 $ 395,923,000