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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% |

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