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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Joint venture investment contribution (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 01, 2023 | Jan. 01, 2019 | Apr. 01, 2017 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Gain on disposal of equipment and other |  |  |  | $ (2,276) | $ (2,187) | $ (2,529)
Santa Monica Imaging Group LLC |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Economic interest | 49.00% | 35.00% | 40.00% |  |  |
Limited partners' contributed capital | $ 11,300 |  |  |  |  |
Gain on disposal of equipment and other | $ 16,800 |  |  |  |  |
Cedars Sinai Medical Center |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Economic interest | 51.00% |  |  |  |  |
Beverly Hills Imaging Center |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Limited partners' contributed capital | $ 27,200 |  |  |  |  |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-3 + Details
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