Medical Claims and Related Payables - Summary Changes in Medical Claims and Related Payables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Liability For Claims And Claims Adjustment Expense [Line Items]
Medical claims and related payables, beginning of the year	$ 239,014
Claims paid related to:
Medical claims and related payables, end of the period	472,323
Medical Claims and Related Payables
Liability For Claims And Claims Adjustment Expense [Line Items]
Medical claims and related payables, beginning of the year	239,014	$ 164,161
Components of incurred costs related to:
Current year	561,478	359,988
Prior years	4,730	366
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	566,123	360,992
Claims paid related to:
Current year	(167,526)	(112,968)
Prior years	(165,316)	(131,363)
Claims paid related	(332,814)	(248,169)
Medical claims and related payables, end of the period	472,323	276,984
Discontinued Operations | Medical Claims and Related Payables
Components of incurred costs related to:
Current year	0	1,229
Prior years	(85)	(591)
Claims paid related to:
Current year	0	(298)
Prior years	$ (28)	$ (3,540)