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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]        
Net income (loss) attributable to Lazard Ltd $ (124,013) $ 95,480 $ (146,185) $ 209,356
Add - adjustment for earnings attributable to participating securities (763) (1,090) (1,888) (2,823)
Net income (loss) attributable to Lazard Ltd - basic (124,776) 94,390 (148,073) 206,533
Add - adjustment for earnings attributable to participating securities 0 554 0 1,683
Net income (loss) attributable to Lazard Ltd - diluted $ (124,776) $ 94,944 $ (148,073) $ 208,216
Weighted average number of shares of common stock outstanding (in shares) 86,787,954 97,380,282 86,261,198 99,007,501
Add - adjustment for shares of common stock issuable on a non-contingent basis (in share) 1,941,700 1,279,891 1,899,555 1,596,223
Weighted average number of shares of common stock outstanding - basic (in shares) 88,729,654 98,660,173 88,160,753 100,603,724
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation (in shares) 0 4,093,163 0 4,866,264
Weighted average number of shares of common stock outstanding - diluted (in shares) 88,729,654 102,753,336 88,160,753 105,469,988
Net income (loss) attributable to Lazard Ltd per share of common stock:        
Basic (in USD per share) $ (1.41) $ 0.96 $ (1.68) $ 2.05
Diluted (in USD per share) $ (1.41) $ 0.92 $ (1.68) $ 1.97
Weighted Average | Share-Based Incentives        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive shares excluded from calculation 3,427,886   4,737,193