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SIGNIFICANT ACCOUNTING POLICIES - Narrative 4 (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
jointVenture
security
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
jointVenture
security
Sep. 30, 2023
USD ($)
Summary of Significant Accounting Policies [Line Items]        
Number of securities without readily determinable fair value | security 4   4  
Book value of RadNet joint venture interests $ 8.0   $ 8.0  
Impairment loss on investment $ 1.2      
Number of unconsolidated joint ventures | jointVenture 13   13  
Management service fees $ 5.9 $ 3.9 $ 17.8 $ 12.2
Dignity Health | Minimum | Joint Venture | Glendale Advanced Imaging        
Summary of Significant Accounting Policies [Line Items]        
Variable interest entity, ownership percentage     33.00%  
Dignity Health | Maximum | Joint Venture | Glendale Advanced Imaging        
Summary of Significant Accounting Policies [Line Items]        
Variable interest entity, ownership percentage     55.00%