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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to Lazard $ 71,247 $ 107,938 $ 186,968 $ 193,602
Adjustment for earnings attributable to participating securities (1,555) (2,579) (4,269) (4,732)
Net income attributable to Lazard - basic 69,692 105,359 182,699 188,870
Adjustment for earnings attributable to participating securities 0 463 0 864
Net income attributable to Lazard - diluted $ 69,692 $ 105,822 $ 182,699 $ 189,734
Weighted average number of shares of common stock outstanding (in shares) 94,527,248 90,276,294 93,360,222 89,665,458
Weighted average number of shares of common stock issuable on a non-contingent basis (in shares) 3,585,145 3,351,182 3,607,157 2,925,977
Weighted average number of shares of common stock outstanding - basic (in shares) 98,112,393 93,627,476 96,967,379 92,591,435
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation (in shares) 9,889,369 9,847,758 8,946,671 8,560,189
Weighted average number of shares of common stock outstanding - diluted (in shares) 108,001,762 103,475,234 105,914,050 101,151,624
Net income attributable to Lazard per share of common stock:        
Basic (in USD per share) $ 0.71 $ 1.13 $ 1.88 $ 2.04
Diluted (in USD per share) $ 0.65 $ 1.02 $ 1.72 $ 1.88
Weighted Average | PIPRs        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive shares excluded from calculation (in shares) 1,572,289 1,229,021 1,985,705 1,541,854