SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Premium revenue	$ 502,918	$ 458,962
ACO REACH revenue	239,807	182,797
Service revenue	13,570	12,392
Investment income (loss)	46	(40,888)
Affiliated revenue		0
Total revenue	756,341	613,263
Operating income (loss)	(85,746)	(159,863)
Depreciation and amortization	9,891	12,897
Restructuring charges	3,357	6,864
Corporate & Eliminations
Segment Reporting Information [Line Items]
Premium revenue	0	0
ACO REACH revenue	0	0
Service revenue	0	0
Investment income (loss)	0	0
Affiliated revenue		(368,053)
Total revenue	0	(368,053)
Operating income (loss)	(58,746)	(58,426)
Depreciation and amortization	2,351	1,436
Restructuring charges	3,338	6,864
Bright HealthCare
Segment Reporting Information [Line Items]
Premium revenue	453,370	430,313
ACO REACH revenue	0	0
Service revenue	0	0
Investment income (loss)	46	80
Affiliated revenue		0
Total revenue	453,416	430,393
Restructuring charges	61	0
Bright HealthCare | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	(31,433)	(31,383)
Depreciation and amortization	4,408	4,459
Restructuring charges	60	0
Consumer Care
Segment Reporting Information [Line Items]
Premium revenue	49,548	28,649
ACO REACH revenue	239,807	182,797
Service revenue	13,570	12,392
Investment income (loss)	0	(40,968)
Affiliated revenue		368,053
Total revenue	302,925	550,923
Restructuring charges	(41)	0
Consumer Care | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	4,433	(70,054)
Depreciation and amortization	3,132	7,002
Restructuring charges	$ (41)	$ 0