SIGNIFICANT ACCOUNTING POLICIES - Schedule of Service Fee Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from External Customer [Line Items]
Total service revenue	$ 522,869	$ 461,142	$ 1,492,498	$ 1,352,563
Commercial insurance
Revenue from External Customer [Line Items]
Total service revenue	287,769	255,376	829,295	752,515
Medicare
Revenue from External Customer [Line Items]
Total service revenue	123,254	102,853	347,641	298,001
Medicaid
Revenue from External Customer [Line Items]
Total service revenue	13,470	10,894	37,735	32,804
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Total service revenue	11,347	10,233	32,460	33,088
Other payors
Revenue from External Customer [Line Items]
Total service revenue	29,962	25,366	87,064	77,336
Management fee revenue
Revenue from External Customer [Line Items]
Total service revenue	7,044	6,241	20,011	18,255
Other revenue
Revenue from External Customer [Line Items]
Total service revenue	18,580	16,616	44,632	35,514
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Total service revenue	$ 31,443	$ 33,563	$ 93,660	$ 105,050