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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Goodwill [Line Items]          
Goodwill $ 502,341   $ 502,341   $ 472,326
Acquisition of other businesses     57,459    
Goodwill impairment 26,681   26,681    
Other     (763)    
Amortization expense 9,298 $ 10,103 18,294 $ 20,576  
Estimated future amortization expense remainder of fiscal year 16,728   16,728    
Estimated future amortization expense year one 32,066   32,066    
Estimated future amortization expense year two 28,939   28,939    
Estimated future amortization expense year three 26,694   26,694    
Estimated future amortization expense year four 23,188   23,188    
Estimated future amortization expense after year four 47,929   47,929    
Impairment of goodwill and tradenames 27,681 $ 1,733 27,681 $ 1,733  
Goodwill, fair value disclosure $ 0   $ 0    
Measurement Input, Growth Rate          
Goodwill [Line Items]          
Reporting unit, measurement input 0.04   0.04    
Measurement Input, Discount Rate          
Goodwill [Line Items]          
Reporting unit, measurement input 0.16   0.16    
Measurement Input, Royalty Rate          
Goodwill [Line Items]          
Reporting unit, measurement input 0.02   0.02    
Tradenames          
Goodwill [Line Items]          
Impairment of intangible assets (excluding goodwill) $ 1,000   $ 1,000    
Indefinite-lived intangible assets (excluding goodwill), fair value disclosure 18,500   18,500    
All Other          
Goodwill [Line Items]          
Goodwill 59,308   59,308   3,280
Acquisition of other businesses     56,028    
Goodwill impairment     0    
Other     0    
Operating Segments | Financial Consulting Segment          
Goodwill [Line Items]          
Goodwill 34,510   34,510   33,310
Acquisition of other businesses     1,431    
Goodwill impairment     0    
Other     (231)    
Operating Segments | Capital Markets Segment          
Goodwill [Line Items]          
Goodwill $ 161,486   161,486   $ 162,018
Acquisition of other businesses     0    
Goodwill impairment     0    
Other     $ (532)