Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Population Health, LLC
Related Party Transaction [Line Items]
Other general expenses	$ 8,400	$ 6,700	$ 5,700
Percentage of ownership interest	49.00%
Outstanding payable	$ 1,000	1,100
CD&R
Related Party Transaction [Line Items]
Advisory consulting fee	800	1,500	$ 1,500
Outstanding payable	0	$ 400
Direct Contracting Entities
Related Party Transaction [Line Items]
Other general expenses	3,900
Outstanding receivable	$ 500