SIGNIFICANT ACCOUNTING POLICIES - Narrative 3 (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) security jointVenture	Mar. 31, 2024 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of securities without readily determinable fair value | security	3
Book value of RadNet joint venture interests	$ 8.3
Number of unconsolidated joint ventures | jointVenture	12
Management service fees	$ 6.1	$ 5.9
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%