Medical Claims and Related Payables - Summary Changes in Medical Claims and Related Payables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Liability For Claims And Claims Adjustment Expense [Line Items]
Medical claims and related payables, beginning of the year	$ 346,727
Claims paid related to:
Medical claims and related payables, end of the period	745,557
Medical Claims and Related Payables
Liability For Claims And Claims Adjustment Expense [Line Items]
Medical claims and related payables, beginning of the year	339,748	$ 239,014
Components of incurred costs related to:
Current year	944,306	561,478
Prior years	28,521	4,730
Discontinued operations - prior years	(28,521)	(4,730)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	972,827	566,123
Claims paid related to:
Current year	(258,217)	(167,526)
Prior years	(320,828)	(165,316)
Discontinued operations - prior years	320,828	165,316
Claims paid related	(579,045)	(332,814)
Medical claims and related payables, end of the period	733,530	472,323
Discontinued Operations | Medical Claims and Related Payables
Components of incurred costs related to:
Prior years	0	(85)
Discontinued operations - prior years	0	85
Claims paid related to:
Prior years	0	(28)
Discontinued operations - prior years	$ 0	$ 28