NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) center $ / shares	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) center segment $ / shares shares	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Number of centers | center	363		363
Number of reportable segments | segment			2
BRMG and NY Groups revenues	$ 51,400	$ 46,800	$ 100,200	$ 92,500
BRMG and NY Groups operating expenses	51,400	46,800	100,200	92,500
Management services provided to BRMG and NY Groups	216,200	202,400	423,600	393,400
BRMG and NY Groups accounts receivable	2,705,290		2,705,290		$ 2,433,907
BRMG and NY Groups accounts payable	1,944,286		1,944,286		1,942,455
Expenses from transactions with related party	$ 345,147	305,775	$ 697,012	620,813
Public Offering | Common Stock
Business Acquisition [Line Items]
Number of shares issued in transaction (in shares) | shares			8,711,250
Stock price (in dollars per share) | $ / shares	$ 29.75		$ 29.75
Gross proceeds			$ 259,200
Public offering expenses			$ 13,000
ScriptSender LLC
Business Acquisition [Line Items]
Ownership percentage	49.00%		49.00%
Book value of RadNet joint venture interests	$ 2,800		$ 2,800
ScriptSender LLC | Equity Method Investee
Business Acquisition [Line Items]
Expenses from transactions with related party	600	$ 600	1,100	$ 1,000
Variable Interest Entity, Primary Beneficiary
Business Acquisition [Line Items]
BRMG and NY Groups accounts receivable	101,900		101,900		100,400
BRMG and NY Groups accounts payable	$ 16,300		$ 16,300		$ 16,900