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NET INCOME (LOSS) 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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net income (loss) attributable to Lazard Ltd $ 7,139 $ 105,797 $ (139,046) $ 315,153
Add - adjustment for earnings attributable to participating securities (1,029) (1,903) (2,917) (4,726)
Net income (loss) attributable to Lazard Ltd - basic 6,110 103,894 (141,963) 310,427
Add - adjustment for earnings attributable to participating securities 0 635 0 2,318
Net income (loss) attributable to Lazard Ltd - diluted $ 6,110 $ 104,529 $ (141,963) $ 312,745
Weighted average number of shares of common stock outstanding (in shares) 87,067,104 91,742,376 86,529,833 96,585,793
Add - adjustment for shares of common stock issuable on a non-contingent basis (in share) 2,358,796 1,533,255 2,052,635 1,575,234
Weighted average number of shares of common stock outstanding - basic (in shares) 89,425,900 93,275,631 88,582,468 98,161,027
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation (in shares) 4,883,324 5,589,525 0 5,107,351
Weighted average number of shares of common stock outstanding - diluted (in shares) 94,309,224 98,865,156 88,582,468 103,268,378
Net income (loss) attributable to Lazard Ltd per share of common stock:        
Basic (in USD per share) $ 0.07 $ 1.11 $ (1.60) $ 3.16
Diluted (in USD per share) $ 0.06 $ 1.06 $ (1.60) $ 3.03
Weighted Average | Share-Based Incentives        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive shares excluded from calculation (in shares)     4,785,903