Relationship with Universal Health Realty Income Trust and Other Related Party Transactions - Additional Information 2 (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) Bed	Sep. 30, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Lease and rental expense	$ 37,295	$ 36,540	$ 109,348	$ 108,165
Financial liability	71,000		71,000			$ 74,000
Relationship with Universal Health Realty Income Trust
Related Party Transaction [Line Items]
Lease and rental expense	$ 5,000	$ 5,000	$ 16,000	$ 16,000
Notice period on renewal of lease			90 days
Behavioral Health Care Facility | Relationship with Universal Health Realty Income Trust
Related Party Transaction [Line Items]
Lease and rental expense						$ 2,800	$ 2,700
Notice period on renewal of lease			270 days
Number of bed available in behavioral health care facility | Bed			100
Period of rights of refusal to leased facilities			30 days
Behavioral Health Care Facility | Relationship with Universal Health Realty Income Trust | Scenario Forecast
Related Party Transaction [Line Items]
Lease and rental expense					$ 2,900