SIGNIFICANT ACCOUNTING POLICIES - Schedule of Service Fee Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue from External Customer [Line Items]
Total service revenue	$ 471,399	$ 431,707
Commercial insurance
Revenue from External Customer [Line Items]
Total service revenue	262,488	240,629
Medicare
Revenue from External Customer [Line Items]
Total service revenue	108,199	93,525
Medicaid
Revenue from External Customer [Line Items]
Total service revenue	11,690	10,887
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Total service revenue	10,459	11,794
Other payors
Revenue from External Customer [Line Items]
Total service revenue	27,691	25,385
Management fee revenue
Revenue from External Customer [Line Items]
Total service revenue	6,279	5,908
Other revenue
Revenue from External Customer [Line Items]
Total service revenue	12,543	9,061
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Total service revenue	$ 32,050	$ 34,518