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Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
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Mar. 01, 2022 | Apr. 29, 2021 | Apr. 24, 2018 | Feb. 28, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Deferred incentive compensation awards |  |  |  | $ 436,200 |  |  |
Award vesting description |  |  |  | The RSUs, RSAs and LFI granted generally provide for one-third vesting on the second anniversary of the grant date and the remaining two-thirds vesting on the third anniversary of the grant date, so long as applicable conditions have been satisfied. PRSUs and the profits interest participation rights, including PRPUs, granted generally provide for vesting on the third anniversary of the grant date, so long as applicable conditions have been satisfied. |  |  |
Lazard Fund Interests [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense, years |  |  |  |  | 9 months 18 days |  |
Non-Executive [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of annual compensation received by directors in the form of DSUs |  |  |  |  | 55.00% |  |
RSUs [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock conversion basis |  |  |  |  | one-for-one |  |
Grant date fair value, amortized periods |  |  |  |  | generally, one-third after two years and the remaining two-thirds after the third year |  |
Number of dividend participation rights issued |  |  |  |  | 455,287 |  |
Charges to retained earnings, net of estimated forfeitures |  |  |  |  | $ 15,611 |  |
Weighted-average grant date fair value of awards granted |  |  |  |  | $ 33.73 | $ 43.38 | $ 42.60
Unrecognized compensation expense |  |  |  |  | $ 115,641 |  |
Unrecognized compensation expense, years |  |  |  |  | 10 months 24 days |  |
DSUs [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grant date fair value of awards granted |  |  |  |  | $ 35.78 | 46.75 | 28.49
DSUs [Member] | Non-Executive [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual compensation received for service |  |  |  |  | 44,772 |  |
Units granted under the directors deferred unit plan |  |  |  |  | 17,640 |  |
RSAs [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grant date fair value of awards granted |  |  |  |  | $ 33.37 | 43.80 | 42.89
Unrecognized compensation expense |  |  |  |  | $ 19,897 |  |
Unrecognized compensation expense, years |  |  |  |  | 10 months 24 days |  |
Dividend participation rights |  |  |  |  | 67,261 |  |
Charges to retained earnings, net of estimated forfeitures |  |  |  |  | $ 2,414 |  |
PRSUs [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grant date fair value of awards granted |  |  |  |  | $ 35.44 | 46.63 | 50.74
Unrecognized compensation expense |  |  |  |  | $ 3,295 |  |
Unrecognized compensation expense, years |  |  |  |  | 9 months 18 days |  |
Descriptions of vesting period |  |  |  |  | PRSUs will vest on a single date approximately three years following the date of the grant |  |
Vesting period |  |  |  |  | 3 years |  |
PRSUs target share distribution for Class A common stock, description |  |  |  |  | The target number of shares of common stock subject to each PRSU is one; however, based on the achievement of both the performance-based and market-based criteria, the number of shares of common stock that may be received will range from zero to 2.4 times the target number. |  |
Profits Interest Participation Rights [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock conversion basis | one-for-one |  |  |  | one-for-one |  |
Weighted-average grant date fair value of awards granted |  |  |  |  | $ 34.53 | $ 44.73 | $ 42.89
Unrecognized compensation expense |  |  |  |  | $ 21,331 |  |
Unrecognized compensation expense, years |  |  |  |  | 10 months 24 days |  |
Descriptions of vesting period |  |  |  |  | Profits interest participation rights generally provide for vesting approximately three years following the grant date |  |
Vesting period |  |  |  |  | 3 years |  |
PRSUs target share distribution for Class A common stock, description |  |  |  |  | The target number of shares of common stock subject to each PRPU is one. Based on the achievement of performance criteria, as determined by the Compensation Committee, the number of shares of common stock that may be received in connection with the PRPU awards granted prior to February 2021 will range from zero to two times the target number. For the PRPU awards granted beginning in February 2021, subject to both performance-based and incremental market-based criteria, the number of shares that may be received will range from zero to 2.4 times the target number. |  |
Percentage of target number of shares subject to the applicable units no longer subject to forfeiture due to threshold level of performance being achieved |  |  |  |  | 25.00% |  |
Common Stock [Member] | RSUs [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Withholding taxes in lieu of share delivery |  |  |  |  | 1,527,476 |  |
Delivery of common stock associated with stock awards |  |  |  |  | 2,619,199 |  |
Common Stock [Member] | RSAs [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Withholding taxes in lieu of share delivery |  |  |  |  | 203,490 |  |
Delivery of common stock associated with stock awards |  |  |  |  | 384,431 |  |
2018 Equity Incentive Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized pertaining to share based compensation arrangements |  |  | 30,000,000 |  |  |  |
Share-based compensation arrangement by share-based payment award, number of additional shares authorized |  | 20,000,000 |  |  |  |  |
Awarded Under 2008 Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of outstanding Class A common stock available under the plan |  |  | 30.00% |  |  |  |
Compensation plan expiration period |  |  | Apr. 24, 2018 |  |  |  |
2005 Equity Incentive Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized pertaining to share based compensation arrangements |  |  |  |  | 25,000,000 |  |

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