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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 |  |

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