Goodwill and Amortizable Intangible Assets - Summary of amortizable Intangible assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 130,769	$ 108,699
Accumulated Amortization	(63,089)	(53,301)
Net Carrying Value	$ 67,680	$ 55,398
Minimum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Maximum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	30 years
Health Plan Contracts
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years
Gross Carrying Amount	$ 39,700	$ 39,700
Accumulated Amortization	(16,983)	(14,336)
Net Carrying Value	22,717	25,364
Trade Names
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	20,300	20,300
Accumulated Amortization	(4,342)	(3,665)
Net Carrying Value	$ 15,958	$ 16,635
Trade Names | Minimum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years
Trade Names | Maximum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	30 years	30 years
Provider Network
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8,400	$ 8,400
Accumulated Amortization	(3,593)	(3,033)
Net Carrying Value	$ 4,807	$ 5,367
Provider Network | Minimum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years	10 years
Provider Network | Maximum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years
Noncompete Agreements
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 59,669	$ 37,599
Accumulated Amortization	(36,100)	(30,355)
Net Carrying Value	$ 23,569	$ 7,244
Noncompete Agreements | Minimum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	2 years
Noncompete Agreements | Maximum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,700	$ 2,700
Accumulated Amortization	(2,071)	(1,912)
Net Carrying Value	$ 629	$ 788
Other Intangible Assets | Minimum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years	4 years
Other Intangible Assets | Maximum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years