GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Goodwill [Roll Forward]
Beginning Balance	$ 373,574	$ 356,369
Acquisition of business	0	16,706
Foreign currency translation adjustments	(427)	248
Ending Balance	373,147	373,323
Financial Advisory
Goodwill [Roll Forward]
Beginning Balance	292,304	291,828
Acquisition of business	0	0
Foreign currency translation adjustments	(427)	248
Ending Balance	291,877	292,076
Asset Management
Goodwill [Roll Forward]
Beginning Balance	81,270	64,541
Acquisition of business	0	16,706
Foreign currency translation adjustments	0	0
Ending Balance	$ 81,270	$ 81,247