BUSINESS COMBINATIONS AND RELATED ACTIVITY - Additional Information (Details) $ in Thousands					12 Months Ended
	Oct. 14, 2024 USD ($)	Mar. 31, 2024 USD ($)	Mar. 29, 2024 USD ($) location	Sep. 01, 2023 USD ($) center location	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Feb. 23, 2024 location
Business Acquisition [Line Items]
Indefinite lived intangible assets					$ 13,000	$ 9,000
Contingent consideration to guarantee share value issued					10,400
Property and equipment, net					694,791	604,401
Goodwill					710,663	679,463	$ 677,665
Sale of economic interests in subsidiary					28,822	2,236	6,623
Equity method investments					8,000
Ventura County Imaging Group
Business Acquisition [Line Items]
Investment at cost		$ 5,100
Additional Paid-In Capital
Business Acquisition [Line Items]
Sale of economic interests in subsidiary					11,905	$ 2,236	$ 6,623
Tri Valley Imaging Group, LLC
Business Acquisition [Line Items]
Number of location | location			4
Providence Health System
Business Acquisition [Line Items]
Number of location | location			3
Providence Health System | Tri Valley Imaging Group, LLC
Business Acquisition [Line Items]
Equity method investments			$ 7,800
Tri Valley Imaging Group, LLC
Business Acquisition [Line Items]
Number of location | location								7
Economic interest			52.00%
Tri Valley Imaging Group, LLC | Additional Paid-In Capital
Business Acquisition [Line Items]
Sale of economic interests in subsidiary					0
Tri Valley Imaging Group, LLC | Tri Valley Imaging Group, LLC
Business Acquisition [Line Items]
Goodwill			$ 6,000
Tri Valley Imaging Group, LLC | Tri Valley Imaging Group, LLC | Fixed Assets
Business Acquisition [Line Items]
Property and equipment, net			1,400
Tri Valley Imaging Group, LLC | Providence Health System
Business Acquisition [Line Items]
Goodwill			6,000
Limited partners' contributed capital			$ 9,600
Minority partner ownership percent			48.00%
Ventura County Imaging Group | Ventura County Imaging Group
Business Acquisition [Line Items]
Percentage Ownership		47.50%
Los Angeles Imaging Group, LLC
Business Acquisition [Line Items]
Economic interest				65.00%
Los Angeles Imaging Group, LLC | Cedars Sinai Medical Center
Business Acquisition [Line Items]
Number of location | location				3
Limited partners' contributed capital				$ 5,900
Economic interest				35.00%
Number of centers contributed | center				3
Kheiron Medical Technologies LTD
Business Acquisition [Line Items]
Total purchase consideration	$ 2,300
Consideration transferred	$ 400
Business combination, contingent consideration, liability, period	18 months
Acquisition related costs	$ 400
Settlement of loan	1,000
Current assets acquired	1,200
Intangible assets	2,700
Current liabilities	(1,500)
Kheiron Medical Technologies LTD | Cash Holdback
Business Acquisition [Line Items]
Contingent consideration to guarantee share value issued	$ 500
Noncompete Agreements | 2024 Business Acquisitions
Business Acquisition [Line Items]
Indefinite lived intangible assets					1,200
Trade Names
Business Acquisition [Line Items]
Indefinite lived intangible assets					8,500
Trade Names | 2024 Business Acquisitions
Business Acquisition [Line Items]
Indefinite lived intangible assets					$ 1,400