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SIGNIFICANT ACCOUNTING POLICIES - Narrative 4 (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) security jointVenture	Mar. 31, 2023 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of securities without readily determinable fair value | security	4
Book value of RadNet joint venture interests	$ 9.2
Number of unconsolidated joint ventures | jointVenture	13
Management service fees	$ 5.9	$ 4.2
Dignity Health | Minimum | Joint Venture | Glendale Advanced Imaging
Summary of Significant Accounting Policies [Line Items]
Variable interest entity, ownership percentage	35.00%
Dignity Health | Maximum | Joint Venture | Glendale Advanced Imaging
Summary of Significant Accounting Policies [Line Items]
Variable interest entity, ownership percentage	55.00%

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Summary of Significant Accounting Policies

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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-Name Accounting Standards Codification
-Section 45
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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