SIGNIFICANT ACCOUNTING POLICIES - Schedule of Service Fee Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from External Customer [Line Items]
Revenue	$ 401,968	$ 350,044	$ 1,196,247	$ 1,046,185
Imaging Center Segment Revenue
Revenue from External Customer [Line Items]
Revenue	399,081	349,144	1,188,849	1,043,129
Commercial insurance
Revenue from External Customer [Line Items]
Revenue	223,555	189,634	665,604	573,259
Medicare
Revenue from External Customer [Line Items]
Revenue	91,886	78,034	267,955	226,827
Medicaid
Revenue from External Customer [Line Items]
Revenue	10,742	9,669	30,882	28,456
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Revenue	9,952	13,200	35,478	38,785
Other patient revenue
Revenue from External Customer [Line Items]
Revenue	10,664	7,646	30,793	22,334
Management fee revenue
Revenue from External Customer [Line Items]
Revenue	3,957	6,099	12,203	17,199
Teleradiology and Software revenue
Revenue from External Customer [Line Items]
Revenue	2,111	3,430	7,327	9,849
Other
Revenue from External Customer [Line Items]
Revenue	6,173	3,431	20,625	12,054
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Revenue	40,041	38,001	117,982	114,366
AI Segment Revenue
Revenue from External Customer [Line Items]
Revenue	2,887	900	7,398	3,056
Service Revenue
Revenue from External Customer [Line Items]
Revenue	$ 401,968	$ 350,044	$ 1,196,247	$ 1,046,185