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Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Apr. 29, 2021 | Apr. 24, 2018 | Jun. 30, 2022 | Jun. 30, 2021
Lazard Fund Interests [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense, years |  |  | 10 months 24 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 |  |  | 221,575 |
Charges to retained earnings, net of estimated forfeitures |  |  | $ 7,056 |
Weighted-average grant date fair value of awards granted |  |  | $ 33.49 | $ 43.11
Unrecognized compensation expense |  |  | $ 161,587 |
Unrecognized compensation expense, years |  |  | 1 year |
DSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value of awards granted |  |  | $ 35.19 | 46.51
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 |  |  | 8,563 |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value of awards granted |  |  | $ 33.21 | 43.27
Unrecognized compensation expense |  |  | $ 31,822 |
Unrecognized compensation expense, years |  |  | 1 year |
Dividend participation rights issued |  |  | 30,290 |
Charges to retained earnings, net of estimated forfeitures |  |  | $ 1,033 |
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
Unrecognized compensation expense |  |  | $ 4,418 |
Unrecognized compensation expense, years |  |  | 1 year 2 months 12 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 the performance criteria, the number of shares of common stock that may be received in connection with each PRSU generally can range from zero to two times the target number for awards granted prior to February 2021. For awards granted beginning in February 2021, based on both the performance-based and market-based criteria, the number of shares of common stock can 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 |
Weighted-average grant date fair value of awards granted |  |  | $ 34.53 | $ 44.73
Unrecognized compensation expense |  |  | $ 51,125 |
Unrecognized compensation expense, years |  |  | 8 months 12 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 in February 2019 and February 2020 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 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 |  |  | 1,493,598 |
Delivery of common stock associated with stock awards |  |  | 2,280,003 |
Common Stock [Member] | Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Withholding taxes in lieu of share delivery |  |  | 142,512 |
Delivery of common stock associated with stock awards |  |  | 229,865 |
Common Stock [Member] | 2018 Equity Incentive Plan [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 |  |  |
Common Stock [Member] | Awarded Under 2008 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of outstanding common stock available under the plan |  | 30.00% |  |
Compensation plan expiration period |  | Apr. 24, 2018 |  |
Common Stock [Member] | 2005 Equity Incentive Plan [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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