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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill, Long-lived assets, Leases, Uninsured risks (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Goodwill | $ 710,663,000 | $ 679,463,000 | $ 677,665,000
Indefinite lived intangible assets | 13,000,000.0 | 9,000,000.0 |
Loss on impairment | 1,275,000 | 3,949,000 | $ 0
Lease abandonment charges | 2,500,000 | 5,100,000 |
Workers' compensation liability, current | 5,600,000 | 3,400,000 |
Medical malpractice deductible per incidence | 10,000 |  |
Blue Shield | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Stop loss policy claim amount | 250,000 |  |
Blue Shield | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Stop loss policy claim amount | 1,000,000.0 |  |
Reinsurance Policy, Type [Axis]: Health Insurance Member |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Self-insurance accrual | 7,800,000 | 7,200,000 |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment of long lived asset | 700,000 | 2,500,000 |
Impairment loss | 1,800,000 | $ 2,700,000 |
Aidence |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Loss on impairment | $ 3,900,000 |  |

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- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-49 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(15)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482598/350-20-45-1 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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