SEGMENT REPORTING - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total consolidated revenues	$ (1,829,664)	$ (1,616,630)	$ (1,430,061)
Segment profit (loss)	104,621	98,697	46,363
Depreciation and amortization	(137,838)	(128,391)	(115,877)
Loss on sale and disposal of equipment	(2,276)	(2,187)	(2,529)
Severance costs	(1,902)	(3,778)	(946)
Interest expense	(79,849)	(64,483)	(50,841)
Equity in earnings in these joint ventures	14,472	6,427	10,390
Non-cash change in fair value of interest rate swaps	(8,006)	(8,185)	39,621
Debt restructuring and extinguishment expenses	(11,292)	0	(731)
Other income	24,916	6,354	(1,833)
Gain on contribution of imaging centers into joint venture	0	16,808	0
Income before income taxes	44,862	38,810	42,969
Total revenue
Segment Reporting Information [Line Items]
Total consolidated revenues	(1,792,319)	(1,590,564)	(1,413,419)
Digital Health
Segment Reporting Information [Line Items]
Total consolidated revenues	(37,345)	(26,066)	(16,642)
Operating Segments
Segment Reporting Information [Line Items]
Total consolidated revenues	(1,858,025)	(1,640,140)	(1,451,477)
Other segment items	1,583,027	1,400,385	1,264,346
Segment profit (loss)	246,637	216,245	165,715
Operating Segments | Total revenue
Segment Reporting Information [Line Items]
Total consolidated revenues	(1,792,319)	(1,590,564)	(1,413,419)
Other segment items	1,542,274	1,381,847	1,246,701
Segment profit (loss)	250,045	208,717	166,718
Operating Segments | Digital Health
Segment Reporting Information [Line Items]
Total consolidated revenues	(65,706)	(49,576)	(38,058)
Other segment items	40,753	18,538	17,645
Segment profit (loss)	(3,408)	7,528	(1,003)
Elimination of intersegment revenues
Segment Reporting Information [Line Items]
Total consolidated revenues	28,361	23,510	21,416
Elimination of intersegment revenues | Total revenue
Segment Reporting Information [Line Items]
Total consolidated revenues	0	0	0
Elimination of intersegment revenues | Digital Health
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 28,361	$ 23,510	$ 21,416