GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 999,656	$ 787,972
Acquisitions	124,414	213,218
Reallocation	0	0
Foreign currency translation	(94)	(1,534)
Goodwill, ending balance	1,123,976	999,656
Credit Group
Goodwill [Roll Forward]
Goodwill, beginning balance	32,196	32,196
Acquisitions	0	0
Reallocation	224,587	0
Foreign currency translation	(104)	0
Goodwill, ending balance	256,679	32,196
Private Equity Group
Goodwill [Roll Forward]
Goodwill, beginning balance	48,070	58,600
Acquisitions	124,392	0
Reallocation	0	(10,530)
Foreign currency translation	0	0
Goodwill, ending balance	172,462	48,070
Real Assets Group
Goodwill [Roll Forward]
Goodwill, beginning balance	277,183	53,339
Acquisitions	22	213,314
Reallocation	0	10,530
Foreign currency translation	0	0
Goodwill, ending balance	277,205	277,183
Secondaries Group
Goodwill [Roll Forward]
Goodwill, beginning balance	417,620	417,738
Acquisitions	0	(96)
Reallocation	0	0
Foreign currency translation	10	(22)
Goodwill, ending balance	417,630	417,620
Other
Goodwill [Roll Forward]
Goodwill, beginning balance	224,587	226,099
Acquisitions	0	0
Reallocation	(224,587)	0
Foreign currency translation	0	(1,512)
Goodwill, ending balance	$ 0	$ 224,587