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Incentive Plans - Additional Information (Details)
$ / shares in Units, $ in Thousands
 2 Months Ended 12 Months Ended
Apr. 24, 2018
Feb. 22, 2024
USD ($)
Dec. 31, 2023
USD ($)
tranche
d
$ / shares
shares
Dec. 31, 2022
$ / shares
Dec. 31, 2021
$ / shares
Jan. 01, 2024
Feb. 01, 2021
Jan. 31, 2021
Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, conversion ratio           1    
Deferred incentive compensation awards | $   $ 374,000            
Cash retention awards granted | $   $ 95,000            
Required service period   3 years            
Lazard Fund Interests                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation expense, period     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)     711,673          
Charges to retained earnings, net of estimated forfeitures | $     $ 21,638          
Units granted (in shares)     5,700,485          
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares     $ 36.49 $ 33.73 $ 43.38      
Unrecognized compensation expense | $     $ 122,498          
Unrecognized compensation expense, period     10 months 24 days          
RSUs | Share-Based Payment Arrangement, Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage     33.33%          
RSUs | Share-Based Payment Arrangement, Tranche 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)     62,654          
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares     $ 29.71 35.78 46.75      
DSUs | Non-Executive                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Units granted (in shares)     62,654          
RSAs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Units granted (in shares)     670,064          
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares     $ 37.60 33.37 43.80      
Unrecognized compensation expense | $     $ 15,967          
Unrecognized compensation expense, period     9 months 18 days          
Dividend participation rights issued (in shares)     94,985          
Charges to retained earnings, net of estimated forfeitures | $     $ 2,977          
PRSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period     3 years          
Common stock, conversion ratio     1          
Vesting period     3 years          
Units granted (in shares)     0          
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares     $ 0 35.44 46.63      
Unrecognized compensation expense | $     $ 1,185          
Unrecognized compensation expense, period     4 months 24 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          
PIPRs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock conversion basis     one-for-one          
Unrecognized compensation expense | $     $ 57,954          
Unrecognized compensation expense, period     1 year 9 months 18 days          
PIPRs Excluding Stock Price PIPRs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period     3 years          
Ordinary PIPRs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Units granted (in shares)     1,521,458          
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares     $ 34.50 32.95 43.23      
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 of awards granted (in usd per share) | $ / shares     $ 0 $ 35.44 $ 46.63      
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)     2,250,000          
Weighted-average grant date fair value of awards granted (in usd per share) | $ / shares     $ 15.06          
Award vesting, number of tranches | tranche     3          
Common stock price, number of consecutive days | d     30          
SP-PIPRs | Scenario, Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vested in period, fair value | $     $ 33,900          
SP-PIPRs | Share-Based Payment Arrangement, Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage     20.00%          
Common stock price, appreciation (as a percent)     25.00%          
Common stock price, appreciation period following date of grant     3 years          
SP-PIPRs | Share-Based Payment Arrangement, Tranche Two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage     40.00%          
Common stock price, appreciation (as a percent)     50.00%          
Common stock price, appreciation period following date of grant     5 years          
SP-PIPRs | Share-Based Payment Arrangement, Tranche Three                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage     40.00%          
Common stock price, appreciation (as a percent)     100.00%          
Common stock price, appreciation period following date of grant     7 years          
Common Stock | RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Withholding taxes in lieu of share delivery (in shares)     1,213,264          
Delivery of common stock associated with stock awards (in shares)     2,158,820          
Common Stock | RSAs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Withholding taxes in lieu of share delivery (in shares)     279,385          
Delivery of common stock associated with stock awards (in shares)     405,260          
2018 Equity Incentive Plan | Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized pertaining to share based compensation arrangements     50,000,000          
Awarded Under 2008 Plan | Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Compensation plan expiration period Apr. 24, 2018