RISK ADJUSTMENT - Schedule of Risk Adjustment Receivables and Payables (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Changes In Risk Adjustment [Roll Forward]
Risk adjustment receivable, beginning balance	$ 56,066	$ 64,779
Risk adjustment payable, beginning balance	2,587,700	1,558,341
Net risk adjustment payable, beginning balance	2,531,634	1,493,562
Risk adjustment receivable, accrual, period increase (decrease)	39,689	22,838
Risk adjustment payable, accrual, period increase (decrease)	2,354,202	1,088,846
Net risk adjustment payable, period increase (decrease)	2,314,513	1,066,008
Risk adjustment receivable, ending balance	95,755	87,617
Risk adjustment payable, ending balance	4,941,902	2,647,187
Net risk adjustment payable, ending balance	4,846,147	2,559,570
Current year
Changes In Risk Adjustment [Roll Forward]
Risk adjustment receivable, accrual, period increase (decrease)	27,970	33,303
Risk adjustment payable, accrual, period increase (decrease)	2,401,634	1,021,779
Net risk adjustment payable, period increase (decrease)	2,373,664	988,476
Risk adjustment receivable, ending balance	27,970	33,303
Risk adjustment payable, ending balance	2,401,634	1,021,779
Net risk adjustment payable, ending balance	2,373,664	988,476
Prior Years
Changes In Risk Adjustment [Roll Forward]
Risk adjustment receivable, accrual, period increase (decrease)	11,719	(10,465)
Risk adjustment payable, accrual, period increase (decrease)	(47,432)	67,067
Net risk adjustment payable, period increase (decrease)	(59,151)	77,532
Risk adjustment receivable, ending balance	67,785	54,314
Risk adjustment payable, ending balance	2,540,268	1,625,408
Net risk adjustment payable, ending balance	$ 2,472,483	$ 1,571,094