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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Goodwill [Line Items]      
Goodwill $ 471,636   $ 472,326
Other (690)    
Estimated future amortization expense after year four 39,726    
Amortization expense 8,996 $ 10,473  
Estimated future amortization expense remainder of fiscal year 24,664    
Estimated future amortization expense year one 30,002    
Estimated future amortization expense year two 26,874    
Estimated future amortization expense year three 24,648    
Estimated future amortization expense year four 21,161    
Operating Segments | Financial Consulting Segment      
Goodwill [Line Items]      
Goodwill 33,152   33,310
Other (158)    
Operating Segments | Capital Markets Segment      
Goodwill [Line Items]      
Goodwill 161,486   $ 162,018
Other $ (532)