Business Combinations and Goodwill - Assumption of Identifiable Assets Acquired and Liabilities (Details) - USD ($) $ in Thousands			12 Months Ended
	Aug. 30, 2019	May 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets acquired
Goodwill			$ 239,053	$ 238,505	$ 185,806
Liabilities assumed
Cash paid			$ 11,354	$ 49,403	$ 0
Dr. Jay | Accountable Health Care IPA
Assets acquired
Cash and cash equivalents	$ 582
Accounts receivable, net	5,150
Other current assets	198
Network relationship intangible assets	11,411
Goodwill	23,566
Liabilities assumed
Accounts payable	(3,759)
Medical liabilities	(12,154)
Subordinated loan	(15,327)
Net assets acquired	9,667
Less: equity investment contributed	2,417
APC and APC-LSMA | Acquisition of Alpha Care
Assets acquired
Cash and cash equivalents		$ 3,569
Accounts receivable, net		10,336
Other current assets		4,675
Network relationship intangible assets		22,636
Goodwill		28,585
Liabilities assumed
Accounts payable		(2,795)
Deferred tax liabilities		(6,334)
Medical liabilities		(15,616)
Net assets acquired		45,056
Cash paid		$ 45,056
APC and APC-LSMA | Dr. Jay | Accountable Health Care IPA
Liabilities assumed
Cash paid	$ 7,250