SEGMENT INFORMATION - Schedule of Segment's Contribution with Respect to Net Revenue, Operating Expenses, Operating Income (Loss) and Total Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net Revenue	$ 685,349	$ 643,114	$ 1,450,102	$ 1,185,550
Operating Expenses	621,709	753,187	1,331,901	1,332,547
Operating Income (Loss)	63,640	(110,073)	118,201	(146,997)
Total Assets	4,527,194		4,527,194		$ 4,635,781
Operating Segments | Financial Advisory
Segment Reporting Information [Line Items]
Net Revenue	411,308	352,477	864,815	630,051
Operating Expenses	370,824	439,445	798,832	768,180
Operating Income (Loss)	40,484	(86,968)	65,983	(138,129)
Total Assets	1,154,804		1,154,804		1,154,483
Operating Segments | Asset Management
Segment Reporting Information [Line Items]
Net Revenue	285,487	288,313	580,963	572,357
Operating Expenses	235,405	269,219	497,085	517,270
Operating Income (Loss)	50,082	19,094	83,878	55,087
Total Assets	1,126,422		1,126,422		1,232,364
Corporate
Segment Reporting Information [Line Items]
Net Revenue	(11,446)	2,324	4,324	(16,858)
Operating Expenses	15,480	44,523	35,984	47,097
Operating Income (Loss)	(26,926)	$ (42,199)	(31,660)	$ (63,955)
Total Assets	$ 2,245,968		$ 2,245,968		$ 2,248,934