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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net Revenue	$ 643,114	$ 639,546	$ 1,185,550	$ 1,334,438
Operating Expenses	753,187	513,708	1,332,547	1,048,872
Operating Income (Loss)	(110,073)	125,838	(146,997)	285,566
Total Assets	4,602,937		4,602,937		$ 5,852,561
Operating Segments | Financial Advisory
Segment Reporting Information [Line Items]
Net Revenue	352,477	407,885	630,051	798,100
Operating Expenses	439,445	316,574	768,180	614,832
Operating Income (Loss)	(86,968)	91,311	(138,129)	183,268
Total Assets	1,122,573		1,122,573		1,099,921
Operating Segments | Asset Management
Segment Reporting Information [Line Items]
Net Revenue	288,313	289,151	572,357	627,652
Operating Expenses	269,219	232,546	517,270	474,062
Operating Income (Loss)	19,094	56,605	55,087	153,590
Total Assets	844,830		844,830		978,083
Corporate
Segment Reporting Information [Line Items]
Net Revenue	2,324	(57,490)	(16,858)	(91,314)
Operating Expenses	44,523	(35,412)	47,097	(40,022)
Operating Income (Loss)	(42,199)	$ (22,078)	(63,955)	$ (51,292)
Total Assets	$ 2,635,534		$ 2,635,534		$ 3,774,557