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Relationship with Universal Health Realty Income Trust and Other Related Party Transactions - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |  |  |
Net revenues | $ 3,843,582,000 | $ 3,467,518,000 |  |  |
Acute Care Hospital Services |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net revenues | $ 2,185,081,000 | $ 1,973,532,000 |  |  |
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% | 0.70%
Pre-tax share of income from the Trust | $ 300,000 | $ 300,000 |  |  |
Dividends received from the Trust | 571,000 | 563,000 |  |  |
Carrying value of investment in Trust | 6,700,000 |  | $ 7,000,000.0 |  |
Market value of investment in Trust | $ 28,900,000 |  | $ 34,100,000 |  |
Relationship with Universal Health Realty Income Trust | Other Related Party Transactions |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Trust outstanding shares held, percentage | 5.70% |  |  |  |
Relationship with Universal Health Realty Income Trust | Advisory Fee |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net revenues | $ 1,300,000 | $ 1,300,000 |  |  |

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