NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details - Narrative) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) center	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) center segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Number of centers | center	349		349
Number of reportable segments | segment			2
BRMG and NY Groups revenues	$ 48,900	$ 43,800	$ 141,400	$ 141,400
BRMG and NY Groups operating expenses	48,900	43,800	135,000	135,000
Management services provided to BRMG and NY Groups	190,600	186,800	584,000	556,400
BRMG and NY Groups accounts receivable	2,247,164		2,247,164		$ 2,058,474
BRMG and NY Groups accounts payable	$ 1,788,774		$ 1,788,774		1,712,317
ScriptSender LLC
Business Acquisition [Line Items]
Ownership percentage	49.00%		49.00%
Book value of RadNet joint venture interests	$ 3,500		$ 3,500
ScriptSender LLC | Operating Expense | Equity Method Investee
Business Acquisition [Line Items]
Expenses from transactions with related party	500	$ 600	1,500	$ 1,800
Variable Interest Entity, Primary Beneficiary
Business Acquisition [Line Items]
BRMG and NY Groups accounts receivable	102,100		102,100		89,200
BRMG and NY Groups accounts payable	$ 14,800		$ 14,800		$ 14,400