Medical Claims and Related Payables - Summary Changes in Medical Claims and Related Payables (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 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	490,840
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	1,756,943	1,217,386
Prior years	14,692	(347)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	1,771,635	1,216,280
Claims paid related to:
Current year	(1,283,242)	(939,588)
Prior years	(236,413)	(148,327)
Claims paid related	(1,519,809)	(1,092,320)
Medical claims and related payables, end of the period	490,840	288,121
Discontinued Operations | Medical Claims and Related Payables
Components of incurred costs related to:
Current year		1,241
Prior years	(154)	(3,164)
Claims paid related to:
Current year		(1,241)
Prior years	$ 0	$ (2,000)