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Incentive Plans - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 2 Months Ended | 12 Months Ended |  |  |
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Apr. 24, 2018 | Feb. 22, 2024 USD ($) | Dec. 31, 2023 USD ($) tranche d $ / shares shares | Dec. 31, 2022 $ / shares | Dec. 31, 2021 $ / shares | Jan. 01, 2024 | Feb. 01, 2021 | Jan. 31, 2021
Subsequent Event |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock, conversion ratio |  |  |  |  |  | 1 |  |
Deferred incentive compensation awards | $ |  | $ 374,000 |  |  |  |  |  |
Cash retention awards granted | $ |  | $ 95,000 |  |  |  |  |  |
Required service period |  | 3 years |  |  |  |  |  |
Lazard Fund Interests |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation expense, period |  |  | 9 months 18 days |  |  |  |  |
RSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock conversion basis |  |  | one-for-one |  |  |  |  |
Number of dividend participation rights issued (in shares) |  |  | 711,673 |  |  |  |  |
Charges to retained earnings, net of estimated forfeitures | $ |  |  | $ 21,638 |  |  |  |  |
Units granted (in shares) |  |  | 5,700,485 |  |  |  |  |
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares |  |  | $ 36.49 | $ 33.73 | $ 43.38 |  |  |
Unrecognized compensation expense | $ |  |  | $ 122,498 |  |  |  |  |
Unrecognized compensation expense, period |  |  | 10 months 24 days |  |  |  |  |
RSUs | Share-Based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  | 33.33% |  |  |  |  |
RSUs | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  | 66.67% |  |  |  |  |
DSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock conversion basis |  |  | one-for-one |  |  |  |  |
Units granted (in shares) |  |  | 62,654 |  |  |  |  |
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares |  |  | $ 29.71 | 35.78 | 46.75 |  |  |
DSUs | Non-Executive |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Units granted (in shares) |  |  | 62,654 |  |  |  |  |
RSAs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Units granted (in shares) |  |  | 670,064 |  |  |  |  |
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares |  |  | $ 37.60 | 33.37 | 43.80 |  |  |
Unrecognized compensation expense | $ |  |  | $ 15,967 |  |  |  |  |
Unrecognized compensation expense, period |  |  | 9 months 18 days |  |  |  |  |
Dividend participation rights issued (in shares) |  |  | 94,985 |  |  |  |  |
Charges to retained earnings, net of estimated forfeitures | $ |  |  | $ 2,977 |  |  |  |  |
PRSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Performance period |  |  | 3 years |  |  |  |  |
Common stock, conversion ratio |  |  | 1 |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |
Units granted (in shares) |  |  | 0 |  |  |  |  |
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares |  |  | $ 0 | 35.44 | 46.63 |  |  |
Unrecognized compensation expense | $ |  |  | $ 1,185 |  |  |  |  |
Unrecognized compensation expense, period |  |  | 4 months 24 days |  |  |  |  |
PRSUs | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target number of shares, multiplier |  |  | 0 |  |  |  |  |
PRSUs | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target number of shares, multiplier |  |  | 2.4 |  |  |  |  |
PIPRs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock conversion basis |  |  | one-for-one |  |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 57,954 |  |  |  |  |
Unrecognized compensation expense, period |  |  | 1 year 9 months 18 days |  |  |  |  |
PIPRs Excluding Stock Price PIPRs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |
Ordinary PIPRs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Units granted (in shares) |  |  | 1,521,458 |  |  |  |  |
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares |  |  | $ 34.50 | 32.95 | 43.23 |  |  |
P-PIPRs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Performance period |  |  | 3 years |  |  |  |  |
Units granted (in shares) |  |  | 0 |  |  |  |  |
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares |  |  | $ 0 | $ 35.44 | $ 46.63 |  |  |
Target number of shares of common stock |  |  | 1 |  |  |  |  |
Minimum Value Condition, period |  |  | 5 years |  |  |  |  |
P-PIPRs | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target number of shares, multiplier |  |  |  |  |  |  | 0 | 0
P-PIPRs | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target number of shares, multiplier |  |  |  |  |  |  | 2.4 | 2
SP-PIPRs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Units granted (in shares) |  |  | 2,250,000 |  |  |  |  |
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares |  |  | $ 15.06 |  |  |  |  |
Award vesting, number of tranches | tranche |  |  | 3 |  |  |  |  |
Common stock price, number of consecutive days | d |  |  | 30 |  |  |  |  |
SP-PIPRs | Scenario, Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vested in period, fair value | $ |  |  | $ 33,900 |  |  |  |  |
SP-PIPRs | Share-Based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |  |  |  |
Common stock price, appreciation (as a percent) |  |  | 25.00% |  |  |  |  |
Common stock price, appreciation period following date of grant |  |  | 3 years |  |  |  |  |
SP-PIPRs | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  | 40.00% |  |  |  |  |
Common stock price, appreciation (as a percent) |  |  | 50.00% |  |  |  |  |
Common stock price, appreciation period following date of grant |  |  | 5 years |  |  |  |  |
SP-PIPRs | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  | 40.00% |  |  |  |  |
Common stock price, appreciation (as a percent) |  |  | 100.00% |  |  |  |  |
Common stock price, appreciation period following date of grant |  |  | 7 years |  |  |  |  |
Common Stock | RSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Withholding taxes in lieu of share delivery (in shares) |  |  | 1,213,264 |  |  |  |  |
Delivery of common stock associated with stock awards (in shares) |  |  | 2,158,820 |  |  |  |  |
Common Stock | RSAs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Withholding taxes in lieu of share delivery (in shares) |  |  | 279,385 |  |  |  |  |
Delivery of common stock associated with stock awards (in shares) |  |  | 405,260 |  |  |  |  |
2018 Equity Incentive Plan | Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized pertaining to share based compensation arrangements |  |  | 50,000,000 |  |  |  |  |
Awarded Under 2008 Plan | Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation plan expiration period | Apr. 24, 2018 |  |  |  |  |  |  |

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