SIGNIFICANT ACCOUNTING POLICIES - Schedule of Service Fee Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from External Customer [Line Items]
Revenue	$ 403,715	$ 354,375	$ 794,279	$ 696,141
Imaging Center Segment Revenue
Revenue from External Customer [Line Items]
Revenue	401,337	352,818	789,768	693,985
Commercial insurance
Revenue from External Customer [Line Items]
Revenue	224,842	195,066	442,044	383,615
Medicare
Revenue from External Customer [Line Items]
Revenue	89,469	77,879	176,093	148,800
Medicaid
Revenue from External Customer [Line Items]
Revenue	9,985	9,704	20,145	18,788
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Revenue	12,821	13,138	25,500	25,586
Other patient revenue
Revenue from External Customer [Line Items]
Revenue	10,391	7,567	20,132	14,689
Management fee revenue
Revenue from External Customer [Line Items]
Revenue	3,998	5,592	8,246	11,100
Teleradiology and Software revenue
Revenue from External Customer [Line Items]
Revenue	4,819	2,421	9,152	6,419
Other
Revenue from External Customer [Line Items]
Revenue	5,215	3,577	10,515	8,623
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Revenue	39,797	37,874	77,941	76,365
AI Segment Revenue
Revenue from External Customer [Line Items]
Revenue	2,378	1,557	4,511	2,156
Service Revenue
Revenue from External Customer [Line Items]
Revenue	$ 403,715	$ 354,375	$ 794,279	$ 696,141