GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Roll Forward]
Beginning Balance	$ 394,898	$ 377,240
Acquisition of business	0	16,729
Foreign currency translation adjustments	(323)	80
Ending Balance	394,575	394,049
Financial Advisory
Goodwill [Roll Forward]
Beginning Balance	313,628	312,699
Acquisition of business	0	0
Foreign currency translation adjustments	(323)	80
Ending Balance	313,305	312,779
Asset Management
Goodwill [Roll Forward]
Beginning Balance	81,270	64,541
Acquisition of business	0	16,729
Foreign currency translation adjustments	0	0
Ending Balance	$ 81,270	$ 81,270