SIGNIFICANT ACCOUNTING POLICIES - Narrative 5 (Details) $ in Thousands		3 Months Ended
	Mar. 29, 2024 USD ($) location	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Feb. 23, 2024 location	Dec. 31, 2023 USD ($)
Summary of Significant Accounting Policies [Line Items]
Property and equipment, net		$ 618,926			$ 604,401
Goodwill		694,292			$ 679,463
Gain (loss) on disposition of property plant equipment		(186)	$ (579)
Book value of RadNet joint venture interests		$ 9,200
Tri Valley Imaging Group, LLC
Summary of Significant Accounting Policies [Line Items]
Number of location offering multi-modality services | location	4
Providence Health System
Summary of Significant Accounting Policies [Line Items]
Number of location offering multi-modality services | location	3
Providence Health System | Tri Valley Imaging Group, LLC
Summary of Significant Accounting Policies [Line Items]
Book value of RadNet joint venture interests	$ 7,800
Tri Valley Imaging Group, LLC
Summary of Significant Accounting Policies [Line Items]
Number of location offering multi-modality services | location				7
Ownership interest	52.00%
Tri Valley Imaging Group, LLC | Additional Paid-In Capital
Summary of Significant Accounting Policies [Line Items]
Gain (loss) on disposition of property plant equipment	$ 7,600
Tri Valley Imaging Group, LLC | Tri Valley Imaging Group, LLC
Summary of Significant Accounting Policies [Line Items]
Goodwill	6,500
Tri Valley Imaging Group, LLC | Tri Valley Imaging Group, LLC | Fixed Assets
Summary of Significant Accounting Policies [Line Items]
Property and equipment, net	600
Tri Valley Imaging Group, LLC | Providence Health System
Summary of Significant Accounting Policies [Line Items]
Goodwill	6,500
Limited partners' contributed capital	$ 9,600
Minority partner ownership percent	48.00%
Tri Valley Imaging Group, LLC | Providence Health System | Fixed Assets
Summary of Significant Accounting Policies [Line Items]
Property and equipment, net	$ 500
Tri Valley Imaging Group, LLC | Providence Health System | Equipment
Summary of Significant Accounting Policies [Line Items]
Property and equipment, net	$ 100