SIGNIFICANT ACCOUNTING POLICIES - Schedule of Service Fee Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total service revenue	$ 638,257	$ 522,869	$ 1,836,608	$ 1,492,498
Commercial insurance
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total service revenue	343,331	287,769	998,859	829,295
Medicare
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total service revenue	158,128	123,254	445,872	347,641
Medicaid
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total service revenue	14,759	13,470	43,239	37,735
Workers' compensation/personal injury
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total service revenue	13,245	11,347	39,091	32,460
Other payors
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total service revenue	37,557	29,962	107,932	87,064
Management fee revenue
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total service revenue	7,574	7,044	22,912	20,011
Other revenue
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total service revenue	32,421	18,580	86,917	44,632
Revenue under capitation arrangements
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total service revenue	$ 31,242	$ 31,443	$ 91,786	$ 93,660