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INCENTIVE PLANS - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 09, 2024 shares | Jun. 30, 2024 USD ($) d tranche $ / shares shares | Jun. 30, 2023 $ / shares | Jan. 01, 2024 | Dec. 31, 2023 USD ($) | Feb. 01, 2021 | Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Conversion ratio |  |  |  | 1 |  |  |
Cash retention awards granted and paid | $ |  | $ 94,000 |  |  |  |  |
Service period |  | 3 years |  |  |  |  |
Amortization of prepaid compensation asset with clawback | $ |  | $ 32,000 |  |  |  |  |
Prepaid compensation asset | $ |  | $ 93,774 |  |  | $ 115,972 |  |
Lazard Fund Interests |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense (in years) |  | 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) |  | 443,272 |  |  |  |  |
Charges to retained earnings, net of estimated forfeitures | $ |  | $ 16,263 |  |  |  |  |
Units granted (in shares) |  | 8,351,633 |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  | $ 38.70 | $ 36.78 |  |  |  |
Unrecognized compensation expense | $ |  | $ 292,538 |  |  |  |  |
Unrecognized compensation expense (in years) |  | 1 year |  |  |  |  |
RSUs | Vesting One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage |  | 33.33% |  |  |  |  |
RSUs | Vesting Two |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage |  | 66.67% |  |  |  |  |
PRSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance period |  | 3 years |  |  |  |  |
Conversion ratio |  | 1 |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |
Units granted (in shares) |  | 0 |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  | $ 0 |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 390 |  |  |  |  |
Unrecognized compensation expense (in years) |  | 2 months 12 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 |  |  |  |  |
Profits Interest Participation Rights Excluding Stock Price PIPRs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |
PIPRs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock conversion basis |  | one-for-one |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 76,635 |  |  |  |  |
Unrecognized compensation expense (in years) |  | 1 year 4 months 24 days |  |  |  |  |
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, granted (in USD per share) | $ / shares |  | $ 0 |  |  |  |  |
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) |  | 0 |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  | $ 0 |  |  |  |  |
Award vesting, number of tranches | tranche |  | 3 |  |  |  |  |
Common stock price, number of consecutive days | d |  | 30 |  |  |  |  |
SP-PIPRs | Vesting One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage |  | 20.00% |  |  |  |  |
Common stock price, appreciation period |  | 3 years |  |  |  |  |
Common stock price, appreciation (as a percent) |  | 25.00% |  |  |  |  |
SP-PIPRs | Vesting Two |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage |  | 40.00% |  |  |  |  |
Common stock price, appreciation period |  | 5 years |  |  |  |  |
Common stock price, appreciation (as a percent) |  | 50.00% |  |  |  |  |
SP-PIPRs | Vesting Three |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage |  | 40.00% |  |  |  |  |
Common stock price, appreciation period |  | 7 years |  |  |  |  |
Common stock price, appreciation (as a percent) |  | 100.00% |  |  |  |  |
SP-PIPRs | Scenario, Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vested in period, fair value | $ |  | $ 33,900 |  |  |  |  |
Ordinary PIPRs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted (in shares) |  | 1,368,964 |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  | $ 38.26 | $ 35.94 |  |  |  |
Prepaid Compensation Asset Related to Cash Retention Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Prepaid compensation asset | $ |  | $ 61,000 |  |  |  |  |
Common Stock | RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Withholding taxes in lieu of share delivery (in shares) |  | 1,561,290 |  |  |  |  |
Delivery of common stock associated with stock awards (in shares) |  | 2,169,708 |  |  |  |  |
Common Stock | PRSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Withholding taxes in lieu of share delivery (in shares) |  | 29,690 |  |  |  |  |
Delivery of common stock associated with stock awards (in shares) |  | 33,479 |  |  |  |  |
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) |  | 70,000,000 |  |  |  |  |

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