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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Goodwill And Intangible Assets [Line Items]            
Goodwill $ 394,049 $ 375,784 $ 394,049 $ 375,784 $ 377,240 $ 379,421
Amortization and other acquisition-related costs 15 $ 15 45 $ 45    
Financial Advisory            
Goodwill And Intangible Assets [Line Items]            
Goodwill 312,779   312,779   312,699  
Asset Management            
Goodwill And Intangible Assets [Line Items]            
Goodwill $ 81,270   $ 81,270   $ 64,541