Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	1 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)	Dec. 31, 2021 USD ($) segment unit	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | segment			1
Number of reportable segments | segment			1
Amount deposit accounts exceeded FDIC insured limit			$ 285,900,000	$ 294,900,000
Amount of short-term marketable securities			53,417,000	67,695,000
Marketable securities – certificates of deposit			25,024,000	67,637,000
Marketable securities - equity securities			24,000,000	36,200,000
Unrealized loss on investments			$ (10,745,000)	0	$ 0
Risk pool surplus or deficits, settlement period after performance year			18 months
Number of main reporting units | unit			3
Impairment of intangible assets			$ 0	0
Impairment of goodwill			0	0
Fiduciary accounts payable			10,534,000	9,642,000
Risk pool settlement				21,800,000	19,800,000
Payment of revenue, monthly amount			7,700,000	7,200,000
Payment of revenue, revenue recognized			59,200,000
Contract liabilities			$ 16,798,000	12,988,000
Voting rights held (more than)			50.00%
Contingent Equity Securities
Summary Of Significant Accounting Policies [Line Items]
Warrants			$ 4,270,000
Contingent equity securities			4,300,000
Accounts Payable and Accrued Expenses
Summary Of Significant Accounting Policies [Line Items]
Payment of revenue			92,400,000
Revenue recognized			400,000
Other Noncurrent Liabilities | Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument
Summary Of Significant Accounting Policies [Line Items]
Derivative liability, fair value, gross liability			1,100,000
Level 2
Summary Of Significant Accounting Policies [Line Items]
Marketable securities – certificates of deposit			0	0
Warrants			1,100,000
Level 2 | Contingent Equity Securities
Summary Of Significant Accounting Policies [Line Items]
Warrants			0
APC | UCAP
Summary Of Significant Accounting Policies [Line Items]
Ownership interest		100.00%
Certificates of Deposit
Summary Of Significant Accounting Policies [Line Items]
Marketable securities – certificates of deposit			$ 25,000,000	67,600,000
Clinigence Holdings, Inc.
Summary Of Significant Accounting Policies [Line Items]
Payments to acquire common stock and warrants	$ 3,000,000
CMS
Summary Of Significant Accounting Policies [Line Items]
Expected period of payment upon termination of agreement			30 days
PMPM
Summary Of Significant Accounting Policies [Line Items]
Contract term			one year
Management contracts
Summary Of Significant Accounting Policies [Line Items]
Contract term			ten years
NGACO
Summary Of Significant Accounting Policies [Line Items]
Contract liabilities			$ 16,300,000	12,600,000
Universal Care Inc | UCAP
Summary Of Significant Accounting Policies [Line Items]
Ownership interest disposed		48.90%
Contingent consideration, cash held in escrow		$ 15,600,000
Contingent consideration, preferred shares		6,400,000
Contingent consideration, fair value		22,000,000
Universal Care Inc | APC
Summary Of Significant Accounting Policies [Line Items]
Additional proceeds to be received from sale of equity method investments, if circumstances met		$ 15,700,000
PASC
Summary Of Significant Accounting Policies [Line Items]
Impairment of investments			0	$ 0	300,000
Trademarks
Summary Of Significant Accounting Policies [Line Items]
Indefinite-lived assets written off					$ 2,000,000
Impairment of intangible assets			$ 0
Minimum
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable, expected to be collected, period			2 years
Property and equipment, useful life			3 years
Minimum | Certificates of Deposit
Summary Of Significant Accounting Policies [Line Items]
Marketable securities, current, maturity period			4 months
Maximum
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable, expected to be collected, period			4 years
Property and equipment, useful life			39 years
Maximum | Certificates of Deposit
Summary Of Significant Accounting Policies [Line Items]
Marketable securities, current, maturity period			24 months