Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax [Line Items]
Effective tax rate	23.11%	20.14%	233.99%
Increase (decrease) in net deferred tax liability	$ 7,900
Income tax expense for excess tax deficiencies	1,100	$ 1,000	$ 7,100
Net operating loss carryforwards for federal and state tax	46,700	61,700	35,400
Operating loss carryforwards subject to expiration	26,400
Operating loss carryforwards not subject to expiration		20,300
Uncertain tax position liability	2,838	4,928	6,168	$ 7,409
Unrecognized tax benefits that would impact effective tax rate	2,800
Increase (decrease) in uncertain tax position	500
Company's accrued liability for interest and penalties related to income tax liabilities	200	800
Net deferred tax assets	72,287	46,935
Capital losses incurred		25,900
Capital loss carryforwards	1,710,000
Income Tax , Penalties and Interest Expense	$ 300	400	$ 500
Benefit related to a change in estimate of an income tax receivable		$ 10,800
Federal tax rate	21.00%	21.00%	21.00%
Increase in net deferred tax assets	$ 25,400
Increase Decrease In Uncollectible Accounts	17,200
Increase decrease reserves and accruals	11,400
Increase decrease in valuation allowance	12,200
Radiology Services Medical Group [Member]
Income Tax [Line Items]
Capital losses incurred	$ 1,690
Earliest Tax Year [Member]
Income Tax [Line Items]
Increase (decrease) in uncertain tax position		$ 1,200
Federal and state income tax examinations	2019
Latest Tax Year [Member]
Income Tax [Line Items]
Increase (decrease) in uncertain tax position	$ 2,100
Federal and state income tax examinations		2021
2020 [Member]
Income Tax [Line Items]
Federal tax rate		35.00%
Minimum [Member]
Income Tax [Line Items]
Expiration period of operating loss carryforwards	2033
Minimum [Member] | Latest Tax Year [Member] | Radiology Services Medical Group [Member]
Income Tax [Line Items]
Expiration period of operating loss carryforwards	2025
Maximum [Member]
Income Tax [Line Items]
Expiration period of operating loss carryforwards	2042
Maximum [Member] | Earliest Tax Year [Member] | Radiology Services Medical Group [Member]
Income Tax [Line Items]
Expiration period of operating loss carryforwards		2027