BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ in Thousands			7 Months Ended	12 Months Ended
	Jul. 01, 2021	Jun. 02, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Asset Acquisition [Line Items]
Acquisition and merger-related expense		$ 5,100
Goodwill		$ 417,800	$ 787,972	$ 787,972	$ 371,047	$ 143,855
Total revenues			98,000
Net income			$ 51,200
Landmark Acquisition
Asset Acquisition [Line Items]
Business combination equity interest in acquiree, percentage		100.00%
Business combination, consideration transferred		$ 1,102,729
Goodwill		417,753
Total revenues				4,276,706	1,910,792
Net income				$ 380,169	$ 112,918
Landmark Acquisition | Management contracts
Asset Acquisition [Line Items]
Acquisition and merger-related expense		$ 425,900
Acquired finite lived intangible assets useful life		7 years 4 months 24 days
Landmark Acquisition | Client relationships
Asset Acquisition [Line Items]
Acquisition and merger-related expense		$ 197,200
Acquired finite lived intangible assets useful life		11 years 9 months 18 days
Landmark Acquisition | Trade name
Asset Acquisition [Line Items]
Acquisition and merger-related expense		$ 86,200
Landmark Partners XVI - GP
Asset Acquisition [Line Items]
Business combination equity interest in acquiree, percentage		60.00%
Black Creek Acquisition
Asset Acquisition [Line Items]
Business combination equity interest in acquiree, percentage	100.00%
Bargain purchase gain	$ 42,300
Black Creek Acquisition | Management contracts
Asset Acquisition [Line Items]
Acquisition and merger-related expense	$ 576,200
Acquired finite lived intangible assets useful life	6 years 1 month 6 days
Black Creek Acquisition | Client relationships
Asset Acquisition [Line Items]
Acquisition and merger-related expense	$ 7,200
Acquired finite lived intangible assets useful life	12 years