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BUSINESS COMBINATIONS AND RELATED ACTIVITY - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 29, 2024 USD ($) location	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Feb. 23, 2024 location	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Valuation adjustment		$ 4,400
Increase in fair value assets acquired and liabilities assumed		4,400
Property and equipment, net		663,867		$ 663,867			$ 604,401
Goodwill		711,841		711,841			$ 679,463
Gain (loss) on disposition of property plant equipment		(148)	$ (527)	(735)	$ (1,183)
Book value of RadNet joint venture interests		$ 8,000		$ 8,000
Tri Valley Imaging Group, LLC
Business Acquisition [Line Items]
Number of location offering multi-modality services | location	4
Providence Health System
Business Acquisition [Line Items]
Number of location offering multi-modality services | location	3
Providence Health System | Tri Valley Imaging Group, LLC
Business Acquisition [Line Items]
Book value of RadNet joint venture interests	$ 7,800
Tri Valley Imaging Group, LLC
Business Acquisition [Line Items]
Number of location offering multi-modality services | location						7
Ownership interest	52.00%
Tri Valley Imaging Group, LLC | Additional Paid-In Capital
Business Acquisition [Line Items]
Gain (loss) on disposition of property plant equipment	$ 7,900
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%

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