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v3.25.3

Relationship with Universal Health Realty Income Trust and Other Related Party Transactions - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Net revenues | $ 4,495,245,000 | $ 3,963,027,000 | $ 12,878,781,000 | $ 11,714,213,000 |  |  |
Acute Care Hospital Services |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Net revenues | 2,630,065,000 | 2,253,819,000 | $ 7,380,328,000 | 6,617,586,000 |  |  |
Relationship with Universal Health Realty Income Trust |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Percentage of advisory fee on average invested real estate assets |  |  | 0.70% |  | 0.70% | 0.70% | 0.70%
Pre-tax share of income from the Trust | 260,000 | 300,000 | $ 828,000 | 914,000 |  |  |
Dividends received from the Trust | 583,000 | 575,000 | 1,700,000 | 1,700,000 |  |  |
Carrying value of investment in Trust | 4,800,000 |  | 4,800,000 |  | $ 5,800,000 |  |
Market value of investment in Trust | $ 30,800,000 |  | $ 30,800,000 |  | $ 29,300,000 |  |
Relationship with Universal Health Realty Income Trust | Other Related Party Transactions |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Trust outstanding shares held, percentage | 5.70% |  | 5.70% |  |  |  |
Relationship with Universal Health Realty Income Trust | Advisory Fee |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Net revenues | $ 1,400,000 | $ 1,400,000 | $ 4,200,000 | $ 4,100,000 |  |  |

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