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INCENTIVE PLANS - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 29, 2021 shares | Apr. 24, 2018 shares | Sep. 30, 2023 USD ($) d $ / shares shares | Sep. 30, 2022 $ / shares | Aug. 31, 2023 tranche | Feb. 01, 2021 | Jan. 31, 2021
Lazard Fund Interests |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense (in years) |  |  | 10 months 24 days |  |  |  |
Non-Executive |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual compensation received by directors in the form of DSUs (as percent) |  |  | 55.00% |  |  |  |
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 |  |  | 515,420 |  |  |  |
Charges to retained earnings, net of estimated forfeitures | $ |  |  | $ 16,736 |  |  |  |
Units granted (in shares) |  |  | 5,496,350 |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  | $ 36.51 | $ 33.64 |  |  |
Unrecognized compensation expense | $ |  |  | $ 156,284 |  |  |  |
Unrecognized compensation expense (in years) |  |  | 1 year |  |  |  |
RSUs | Three Years Following Date of Grant |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage |  |  | 33.33% |  |  |  |
RSUs | Five Years Following Date of Grant |  |  |  |  |  |  |
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] |  |  |  |  |  |  |
Units granted (in shares) |  |  | 58,414 |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  | $ 29.87 | 35.53 |  |  |
DSUs | Non-Executive |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted (in shares) |  |  | 43,999 |  |  |  |
Units granted under the directors deferred unit plan (in shares) |  |  | 14,415 |  |  |  |
RSAs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted (in shares) |  |  | 646,979 |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  | $ 37.65 | 33.31 |  |  |
Dividend participation rights issued (in shares) |  |  | 71,900 |  |  |  |
Net of estimated forfeitures | $ |  |  | $ 2,358 |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 20,050 |  |  |  |
Unrecognized compensation expense (in years) |  |  | 10 months 24 days |  |  |  |
PRSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  |  | 35.44 |  |  |
Unrecognized compensation expense | $ |  |  | $ 1,754 |  |  |  |
Unrecognized compensation expense (in years) |  |  | 6 months |  |  |  |
Vesting period |  |  | 3 years |  |  |  |
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 |  |  |  |
SPRPUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted (in shares) |  |  | 2,250,000 |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  | $ 15.06 |  |  |  |
Award vesting, number of tranches | tranche |  |  |  |  | 3 |  |
Common stock price, number of consecutive days | d |  |  | 30 |  |  |  |
SPRPUs | Scenario, Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vested in period, fair value | $ |  |  | $ 33,900 |  |  |  |
SPRPUs | Three Years Following Date of Grant |  |  |  |  |  |  |
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% |  |  |  |
SPRPUs | Five Years Following Date of Grant |  |  |  |  |  |  |
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% |  |  |  |
SPRPUs | Seven Years Following Date of Grant |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock price, appreciation (as a percent) |  |  | 100.00% |  |  |  |
Profits Interest Participation Rights Excluding SPRPUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |
Profits Interest Participation Rights |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock conversion basis |  |  | one-for-one |  |  |  |
Units granted (in shares) |  |  | 3,488,074 |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  | $ 22.47 | $ 34.53 |  |  |
Unrecognized compensation expense | $ |  |  | $ 57,590 |  |  |  |
Unrecognized compensation expense (in years) |  |  | 1 year 10 months 24 days |  |  |  |
PRPUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted (in shares) |  |  | 0 |  |  |  |
PRPUs | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target number of shares, multiplier |  |  |  |  |  | 0 | 0
PRPUs | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target number of shares, multiplier |  |  |  |  |  | 2.4 | 2
Common Stock | RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Withholding taxes in lieu of share delivery (in shares) |  |  | 1,204,403 |  |  |  |
Delivery of common stock associated with stock awards (in shares) |  |  | 2,155,547 |  |  |  |
Common Stock | RSAs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Withholding taxes in lieu of share delivery (in shares) |  |  | 268,402 |  |  |  |
Delivery of common stock associated with stock awards (in shares) |  |  | 391,880 |  |  |  |
2018 Equity Incentive Plan | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate number of shares authorized (in shares) | 20,000,000 |  |  |  |  |  |
Common stock shares authorized (in shares) |  | 30,000,000 |  |  |  |  |
Awarded Under 2008 Plan | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Outstanding common stock available (as percent) |  | 30.00% |  |  |  |  |
Compensation plan expiration period |  | Apr. 24, 2018 |  |  |  |  |
2005 Equity Incentive Plan | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock shares authorized (in shares) |  |  | 25,000,000 |  |  |  |

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