Business - Additional Information (Details) $ / shares in Units, $ in Thousands				1 Months Ended	12 Months Ended
	Apr. 19, 2021 USD ($) $ / shares shares	Apr. 15, 2021 shares	Apr. 14, 2021 shares	Apr. 30, 2021 USD ($) shares	Dec. 31, 2021 USD ($) Medicare shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)
Subsidiary Sale Of Stock [Line Items]
Number Of Medicare Advantage Members Enrolled With Private Health Plans | Medicare					186,300
Number of shares issued and sold | shares				11,700,000		1,200,000
Shares sold, price per share | $ / shares	$ 23.00
Proceeds from initial public offering					$ 1,170,942	$ 0	$ 0
Number of shares issued under share-based awards | shares	11,700,000				9,300,000	2,340,000
Stock-based compensation expense				$ 2,600	$ 292,394	$ 6,472	$ 4,399
Former Chief Executive Officer | Employee Severance
Subsidiary Sale Of Stock [Line Items]
Severance Costs				3,700
Options Vesting
Subsidiary Sale Of Stock [Line Items]
Stock-based compensation expense				$ 268,500
loan to partner for taxes payable on share distribution					76,800
Common Stock
Subsidiary Sale Of Stock [Line Items]
Number of shares issued and sold | shares						1,235,000
Common Stock | Two Thousand And Twenty One Omnibus Equity Incentive Plan
Subsidiary Sale Of Stock [Line Items]
Number of shares issued under share-based awards | shares				1,900,000
IPO
Subsidiary Sale Of Stock [Line Items]
Number of shares issued and sold | shares	53,590,000
Estimated offering costs	$ 7,800
Stock-based compensation expense				$ 268,500	$ 2,600
IPO | Common Stock
Subsidiary Sale Of Stock [Line Items]
Number of shares issued and sold | shares					53,590,000
Proceeds from initial public offering	$ 1,200,000
Number of shares issued under share-based awards | shares	53,590,000	6,990,000	46,600,000