Related-Party Transactions - Fees Incurred and Income Received (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Related Party Transaction [Line Items]
Net total	$ 11,792	$ 10,850
AHMC
Related Party Transaction [Line Items]
AHMC – Risk pool and capitation	11,999	11,600
HSMSO
Related Party Transaction [Line Items]
Management fees	(132)	(650)
Aurion
Related Party Transaction [Line Items]
Management fees	$ (75)	$ (100)