Related-Party Transactions - Fees Incurred and Income Received (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Related Party Transaction [Line Items]
Receipts, net	$ 12,588	$ 5,815	$ 25,533	$ 17,607
AHMC
Related Party Transaction [Line Items]
AHMC – Risk pool, capitation, claims payment	12,696	6,057	25,793	18,056
Receipts, net	14,200	31,200	10,200	21,000
HSMSO
Related Party Transaction [Line Items]
Management fees	(31)	(189)	(108)	(321)
Aurion
Related Party Transaction [Line Items]
Management fees	$ (77)	$ (53)	$ (152)	$ (128)