SIGNIFICANT ACCOUNTING POLICIES - Schedule of Service Fee Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue from External Customer [Line Items]
Revenue	$ 390,564	$ 341,767
Imaging Center Segment Revenue
Revenue from External Customer [Line Items]
Revenue	388,431	341,168
Commercial insurance
Revenue from External Customer [Line Items]
Revenue	217,209	188,465
Medicare
Revenue from External Customer [Line Items]
Revenue	86,624	70,999
Medicaid
Revenue from External Customer [Line Items]
Revenue	10,153	9,087
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Revenue	12,675	12,449
Other patient revenue
Revenue from External Customer [Line Items]
Revenue	9,745	7,123
Management fee revenue
Revenue from External Customer [Line Items]
Revenue	4,248	5,508
Teleradiology and Software revenue
Revenue from External Customer [Line Items]
Revenue	4,333	3,399
Other
Revenue from External Customer [Line Items]
Revenue	5,300	5,647
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Revenue	38,144	38,491
AI Segment Revenue
Revenue from External Customer [Line Items]
Revenue	$ 2,133	$ 599