Commitments and Contingencies (Details) - USD ($)	1 Months Ended	3 Months Ended
	Aug. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Business Acquisition, Contingent Consideration
Contingent consideration		$ 43,100,000	$ 41,400,000
Membership interest contingent on successful bid		15.00%
Credit line capacity		$ 197,411,000
Purchase obligation		82,500,000
Accrued Liabilities
Business Acquisition, Contingent Consideration
Contingent consideration		5,300,000	11,800,000
Other Noncurrent Liabilities
Business Acquisition, Contingent Consideration
Contingent consideration		$ 37,900,000	$ 29,600,000
Line of Credit | Veterans Accountable Care Group LLC
Business Acquisition, Contingent Consideration
Credit line capacity	$ 50,000,000.0
Line of credit maturity term	5 years
Interest rate on credit facility	6.50%