Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	12 Months Ended
	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