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NET INCOME PER SHARE OF COMMON STOCK - Schedule of Company's Basic and Diluted Net Income Per Share and Weighted Average Shares Outstanding (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to Lazard $ 55,346 $ 49,909 $ 115,721 $ 85,664
Adjustment for earnings attributable to participating securities (904) (873) (2,713) (2,152)
Net income attributable to Lazard - basic 54,442 49,036 113,008 83,512
Adjustment for earnings attributable to participating securities 0 206 0 401
Net income attributable to Lazard - diluted $ 54,442 $ 49,242 $ 113,008 $ 83,913
Weighted average number of shares of common stock outstanding (in shares) 94,242,231 90,172,325 92,776,709 89,360,041
Weighted average number of shares of common stock issuable on a non-contingent basis (in shares) 3,292,088 2,714,039 3,618,162 2,713,373
Weighted average number of shares of common stock outstanding - basic (in shares) 97,534,319 92,886,364 96,394,871 92,073,414
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation (in shares) 7,377,314 7,741,503 8,475,322 7,916,403
Weighted average number of shares of common stock outstanding - diluted (in shares) 104,911,633 100,627,867 104,870,193 99,989,817
Net income attributable to Lazard per share of common stock:        
Basic (in USD per share) $ 0.56 $ 0.53 $ 1.17 $ 0.91
Diluted (in USD per share) $ 0.52 $ 0.49 $ 1.08 $ 0.84
Weighted Average | PIPRs        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive shares excluded from calculation (in shares) 1,570,105 1,229,021 2,192,413 1,698,271