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SIGNIFICANT ACCOUNTING POLICIES - Narrative 4 (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) security jointVenture | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) security jointVenture | Jun. 30, 2023 USD ($)
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 | $ 9.2 |  | $ 9.2 |
Number of unconsolidated joint ventures | jointVenture | 13 |  | 13 |
Management service fees | $ 6.1 | $ 4.0 | $ 12.0 | $ 8.2
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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