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Business and Summary of Significant Accounting Policies - Other Assets and Intangible Assets - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |
Impairment of intangible assets | $ 0 | $ 0 | $ 0
Provision for asset impairment | 0 | 0 | 57,550,000
Other (Income) Expense, Net |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |
Provision for asset impairment |  |  | $ 58,000,000
Commercial Insurance Subsidiary |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |
Statutorily required capital reserves | 118,000,000 | 113,000,000 |
Universal Health Realty Income Trust |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |
Investments | 6,000,000 | 7,000,000 |
Premier, Inc. |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |
Investments | $ 47,000,000 | $ 50,000,000 |

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