INCENTIVE PLANS - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) d tranche $ / shares shares	Mar. 31, 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 | $	$ 92,000
Service period	3 years
Amortization of prepaid compensation asset with clawback | $	$ 11,000
Prepaid compensation asset | $	$ 122,235			$ 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)	230,377
Charges to retained earnings, net of estimated forfeitures | $	$ 8,814
Units granted (in shares)	8,012,750
Weighted average grant date fair value, granted (in USD per share) | $ / shares	$ 38.75	$ 37.44
Unrecognized compensation expense | $	$ 365,760
Unrecognized compensation expense (in years)	1 year 1 month 6 days
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%
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock conversion basis	one-for-one
Units granted (in shares)	3,146
Weighted average grant date fair value, granted (in USD per share) | $ / shares	$ 37.22	37.85
DSUs | Non-Executive
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	3,146
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	16,268
Weighted average grant date fair value, granted (in USD per share) | $ / shares	$ 36.13	37.75
Unrecognized compensation expense | $	$ 11,912
Unrecognized compensation expense (in years)	8 months 12 days
Dividend participation rights issued (in shares)	16,268
Net of estimated forfeitures | $	$ 627
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 | $	$ 704
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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock conversion basis	one-for-one
Unrecognized compensation expense | $	$ 100,467
Unrecognized compensation expense (in years)	1 year 3 months 18 days
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
Performance 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
Performance PIPRs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target number of shares, multiplier					0	0
Performance PIPRs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target number of shares, multiplier					2.4	2
Stock Price 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
Stock Price PIPRs | Scenario, Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested in period, fair value | $	$ 33,900
Stock Price 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%
Stock Price 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%
Stock Price 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%
Profits Interest Participation Rights Excluding Stock Price PIPRs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Prepaid Compensation Asset Related To Cash Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Prepaid compensation asset | $	$ 81,000
Common Stock | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Withholding taxes in lieu of share delivery (in shares)	1,240,025
Delivery of common stock associated with stock awards (in shares)	1,788,672
Common Stock | RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Withholding taxes in lieu of share delivery (in shares)	173,767
Delivery of common stock associated with stock awards (in shares)	238,221
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]
Common stock shares authorized (in shares)	50,000,000