PROPERTY AND EQUIPMENT - Additional Information (Details ) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 116,200	$ 105,600	$ 92,300
Construction in Progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	42,700	73,400
Medical Equipment
Property, Plant and Equipment [Line Items]
Construction in progress, gross	12,200	26,600
Computer and Office Equipment
Property, Plant and Equipment [Line Items]
Construction in progress, gross	1,900	5,300
Software costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	47,286	36,015
Construction in progress, gross	6,000	400
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	537,853	501,963
Construction in progress, gross	$ 22,600	$ 41,100