NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) center segment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Number of centers | center	363
Number of reportable segments | segment	2
BRMG and NY Groups revenues	$ 48,800	$ 45,700
BRMG and NY Groups operating expenses	48,800	45,700
Management services provided to BRMG and NY Groups	207,400	191,000
BRMG and NY Groups accounts receivable	2,414,069		$ 2,433,907
BRMG and NY Groups accounts payable	$ 1,920,968		1,942,455
ScriptSender LLC
Business Acquisition [Line Items]
Ownership percentage	49.00%
Book value of RadNet joint venture interests	$ 3,100
ScriptSender LLC | Operating Expense | Equity Method Investee
Business Acquisition [Line Items]
Expenses from transactions with related party	500	$ 400
Variable Interest Entity, Primary Beneficiary
Business Acquisition [Line Items]
BRMG and NY Groups accounts receivable	103,100		100,400
BRMG and NY Groups accounts payable	$ 18,800		$ 16,900