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INCENTIVE PLANS - Additional Information (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Apr. 29, 2021
shares
Apr. 24, 2018
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
$ / shares
Feb. 01, 2021
Jan. 31, 2021
Lazard Fund Interests            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense (in years)     1 year      
Non-Executive            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Annual compensation received by directors in the form of DSUs (as percent)     55.00%      
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     352,254      
Charges to retained earnings, net of estimated forfeitures | $     $ 11,311      
Units granted (in shares)     4,996,312      
Weighted average grant date fair value, granted (in USD per share) | $ / shares     $ 36.75 $ 33.49    
Unrecognized compensation expense | $     $ 189,180      
Unrecognized compensation expense (in years)     1 year      
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]            
Units granted (in shares)     53,997      
Weighted average grant date fair value, granted (in USD per share) | $ / shares     $ 29.50 35.19    
DSUs | Non-Executive            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Units granted (in shares)     43,999      
Units granted under the directors deferred unit plan (in shares)     9,998      
RSAs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Units granted (in shares)     625,833      
Weighted average grant date fair value, granted (in USD per share) | $ / shares     $ 37.69 33.21    
Net of estimated forfeitures | $     $ 1,650      
Unrecognized compensation expense | $     $ 25,871      
Unrecognized compensation expense (in years)     10 months 24 days      
Dividend participation rights issued (in shares)     50,754      
PRSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average grant date fair value, granted (in USD per share) | $ / shares       35.44    
Unrecognized compensation expense | $     $ 2,322      
Unrecognized compensation expense (in years)     7 months 6 days      
Vesting period     3 years      
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      
Weighted average grant date fair value, granted (in USD per share) | $ / shares     $ 35.94 $ 34.53    
Unrecognized compensation expense | $     $ 34,515      
Unrecognized compensation expense (in years)     10 months 24 days      
Vesting period     3 years      
Target number of shares PRPUs (as percent)     25.00%      
Profits interest participation rights | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Target number of shares, multiplier         0 0
Profits interest participation rights | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Target number of shares, multiplier         2.4 2
Common Stock | RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Withholding taxes in lieu of share delivery (in shares)     1,121,423      
Delivery of common stock associated with stock awards (in shares)     1,711,773      
Common Stock | RSAs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Withholding taxes in lieu of share delivery (in shares)     202,120      
Delivery of common stock associated with stock awards (in shares)     271,239      
2018 Equity Incentive Plan | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate number of shares authorized (in shares) 20,000,000          
Common stock shares authorized (in shares)   30,000,000        
Awarded Under 2008 Plan | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Outstanding common stock available (as percent)   30.00%        
Compensation plan expiration period   Apr. 24, 2018        
2005 Equity Incentive Plan | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock shares authorized (in shares)     25,000,000