The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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-Name Accounting Standards Codification
-Topic 220
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-Section S99
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Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

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Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Related-Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Net medical claims incurred	$ 436,422	$ 144,846	$ 1,109,375	$ 410,540	$ 590,468	$ 450,645
General and administrative expenses	45,749	29,847	129,983	79,798	120,444	94,757
CarePoint Health Contract
Related Party Transaction [Line Items]
Net medical claims incurred	1,700	1,900	9,200	5,300	$ 11,100	$ 9,700
Rogue Trading
Related Party Transaction [Line Items]
Marketing expense	300	100	300	100
Medical Records Exchange, LLC
Related Party Transaction [Line Items]
General and administrative expenses	$ 100	$ 100	$ 100	$ 100