SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Service Fee Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenue from External Customer [Line Items]
Total revenue	$ 2,040,210	$ 1,829,664	$ 1,616,630
Commercial insurance
Revenue from External Customer [Line Items]
Total revenue	1,130,114	1,018,327	879,792
Medicare
Revenue from External Customer [Line Items]
Total revenue	476,987	410,072	356,506
Medicaid
Revenue from External Customer [Line Items]
Total revenue	51,736	44,736	42,302
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Total revenue	44,700	43,666	46,406
Other payors
Revenue from External Customer [Line Items]
Total revenue	118,599	104,888	87,675
Management fee revenue
Revenue from External Customer [Line Items]
Total revenue	27,516	24,676	17,936
Other revenue
Revenue from External Customer [Line Items]
Total revenue	65,021	46,724	32,580
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Total revenue	$ 125,537	$ 136,575	$ 153,433