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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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net income (loss) attributable to Lazard $ 279,912 $ (75,479) $ 357,517
Adjustment for earnings attributable to participating securities (6,886) (4,440) (5,732)
Net income (loss) attributable to Lazard - basic 273,026 (79,919) 351,785
Adjustment for earnings attributable to participating securities 1,233 0 2,641
Net income (loss) attributable to Lazard - diluted $ 274,259 $ (79,919) $ 354,426
Weighted average number of shares of common stock outstanding (in shares) 89,858,730 86,751,822 93,994,663
Weighted average number of shares of common stock issuable on a non-contingent basis (in shares) 3,280,622 2,242,163 1,669,466
Weighted average number of shares of common stock outstanding - basic (in shares) 93,139,352 88,993,985 95,664,129
Weighted average number of incremental shares of common stock issuable from share-based incentive compensation (in shares) 9,252,819 0 5,333,545
Weighted average number of shares of common stock outstanding - diluted (in shares) 102,392,171 88,993,985 100,997,674
Net income (loss) attributable to Lazard per share of common stock:      
Basic (in usd per share) $ 2.93 $ (0.90) $ 3.68
Diluted (in usd per share) $ 2.68 $ (0.90) $ 3.51
Share-Based Incentives      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially dilutive shares excluded from calculation (in shares) 1,463,646,000 4,779,627,000