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Related-Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jul. 31, 2025	Jul. 01, 2025	May 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Related Party Transaction [Line Items]
Revenue	$ 956,048	$ 478,710	$ 2,231,243	$ 1,369,331
Operating lease right-of-use assets	33,936		33,936					$ 32,601
Expenses payable	700	400	3,900	2,100
Investments in privately held entities	8,896		8,896					8,896
Operating lease liabilities	37,352		37,352
Operating lease liabilities	7,181		7,181					5,350
Payments for repurchase of shares			10,600	0
Third Way Health \| Agreement for Future Equity Fund
Related Party Transaction [Line Items]
Investments in privately held entities	6,000		6,000					6,000
Risk pool settlements and incentives
Related Party Transaction [Line Items]
Revenue	30,798	21,779	60,691	57,564
Related Party \| Management Fee and Provider Services \| Equity Method Investments
Related Party Transaction [Line Items]
Related party transaction, amount of transaction	1,100	1,700
Related Party \| Management Fee Services, Provider Services, and Interest Expense \| Equity Method Investments
Related Party Transaction [Line Items]
Related party transaction, amount of transaction			4,900	4,100
Allied Pacific Holdings Investment Management, LLC \| Chief Executive Officer
Related Party Transaction [Line Items]
Operating lease right-of-use assets	6,600		6,600					2,700
Operating lease liabilities	7,000		7,000					2,700
AHMC
Related Party Transaction [Line Items]
Amount outstanding under agreement	59,400		59,400					$ 47,700
AHMC \| Related Party \| Risk pool settlements and incentives
Related Party Transaction [Line Items]
Revenue	5,200	9,400	13,100	28,500
APC \| Board Members \| Provider Services
Related Party Transaction [Line Items]
Related party transaction, amount of transaction	5,300	4,600	14,500	14,100
APC \| Board Members Who Are Also Officers \| Provider Services
Related Party Transaction [Line Items]
Related party transaction, amount of transaction	1,200	800	2,400	2,200
AMG \| Allied Pacific Holdings Investment Management, LLC \| Office Lease
Related Party Transaction [Line Items]
Related party transaction, amount of transaction	$ 1,200	$ 1,300	$ 3,700	$ 3,000
I Health, Inc.
Related Party Transaction [Line Items]
Equity interest (as a percent)	25.00%		25.00%		62.50%	62.50%	37.50%		25.00%