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Relationship with Universal Health Realty Income Trust and Other Related Party Transactions - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jan. 01, 2023 | Sep. 30, 2023 USD ($) Facility SquareFoot | Mar. 31, 2023 USD ($) Bed SquareFoot | Sep. 30, 2022 USD ($) | Dec. 31, 2013 | Sep. 30, 2023 USD ($) Bed Facility Hospital | Sep. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) Facility | Dec. 31, 2021 USD ($) Bed | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ 3,562,774,000 |  | $ 3,336,027,000 |  | $ 10,578,430,000 | $ 9,952,390,000 |  |  |  |
Lease and rental expense |  | $ 35,466,000 |  | 33,264,000 |  | $ 105,775,000 | 97,075,000 |  |  |  |
Number of hospital facilities | Hospital |  |  |  |  |  | 5 |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  |  |  |  |  | true |  |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated payments to acquire life insurance policies |  |  |  |  |  | $ 28,000,000 |  |  |  |  |
Payments to acquire life insurance policies, net |  |  |  |  |  |  |  |  | $ 1,000,000.0 |  |
Chief Executive Officer | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire life insurance policies, net |  |  |  |  |  |  |  | $ 1,000,000.0 |  |  |
Chief Executive Officer | Trust Owned by CEO |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated payments to acquire life insurance policies |  |  |  |  |  | $ 9,000,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Real estate leases option to extend lease term |  | 5 years |  |  |  | 5 years |  |  |  |  |
Lease initial terms |  | 5 years |  |  |  | 5 years |  |  |  |  |
Minimum | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated death benefit proceeds |  |  |  |  |  | $ 37,000,000 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Real estate leases option to extend lease term |  | 10 years |  |  |  | 10 years |  |  |  |  |
Lease initial terms |  | 10 years |  |  |  | 10 years |  |  |  |  |
Acute Care Hospital Services |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ 2,017,288,000 |  | 1,919,678,000 |  | $ 5,993,899,000 | $ 5,707,510,000 |  |  |  |
Canyon Creek Behavioral Health |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of annual rental increase on cumulative and compound basis | 2.25% |  |  |  |  |  |  |  |  |  |
Asset Purchase and Sale Agreement | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate assets |  |  |  |  |  |  |  |  |  | $ 4,000,000 |
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 |  | 100,000 |  | 275,000 |  | $ 670,000 | $ 882,000 |  |  |  |
Dividends received from the Trust |  | 567,000 |  | 559,000 |  | 1,700,000 | 1,700,000 |  |  |  |
Carrying value of investment in Trust |  | 7,300,000 |  |  |  | 7,300,000 |  |  | $ 8,400,000 |  |
Market value of investment in Trust |  | 31,800,000 |  |  |  | 31,800,000 |  |  | 37,600,000 |  |
Financial liability included in debt |  | 78,000,000 |  |  |  | 78,000,000 |  |  | 81,000,000 |  |
Lease and rental expense |  | $ 5,000,000 |  | 5,000,000 |  | $ 15,000,000 | 15,000,000 |  |  |  |
Number of square feet to be acquired | SquareFoot |  | 79,500 |  |  |  |  |  |  |  |  |
Notice period on renewal of lease |  |  |  |  |  | 90 days |  |  |  |  |
Number of free-standing emergency departments to be acquired | Facility |  | 2 |  |  |  | 2 |  |  |  |  |
Number of square feet to be constructed | SquareFoot |  |  | 86,000 |  |  |  |  |  |  |  |
Number of beds available in acute care hospital | Bed |  |  | 170 |  |  |  |  |  |  |  |
Percentage of master lease rentable square feet |  | 100.00% | 68.00% |  |  |  |  |  |  |  |
Relationship with Universal Health Realty Income Trust | Minimum |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease and rental expense |  | $ 624,000 | $ 1,300,000 |  |  |  |  |  |  |  |
Relationship with Universal Health Realty Income Trust | Minimum | Limited Liability Companies |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-controlling ownership interests by subsidiaries |  | 95.00% |  |  |  | 95.00% |  |  |  |  |
Relationship with Universal Health Realty Income Trust | Maximum | Limited Liability Companies |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-controlling ownership interests by subsidiaries |  | 100.00% |  |  |  | 100.00% |  |  |  |  |
Relationship with Universal Health Realty Income Trust | Aiken, South Carolina | Behavioral Health Care Facility |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease and rental expense |  |  |  |  |  | $ 2,700,000 | 2,600,000 |  |  |  |
Notice period on renewal of lease |  |  |  |  |  | 270 days |  |  |  |  |
Period of rights of refusal to leased facilities |  |  |  |  |  | 30 days |  |  |  |  |
Number of bed available in behavioral health care facility | Bed |  |  |  |  |  | 100 |  |  |  |  |
Relationship with Universal Health Realty Income Trust | Aiken Regional Medical Center |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease rent receivable |  |  |  |  |  |  |  |  | 3,900,000 |  |
Relationship with Universal Health Realty Income Trust | Canyon Creek Behavioral Health |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease rent receivable |  |  |  |  |  |  |  |  | 1,800,000 |  |
Relationship with Universal Health Realty Income Trust | Aiken Regional Medical Center and Canyon Creek Behavioral Health |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial lease term on property |  |  |  |  |  |  |  |  |  | 12 years |
Real estate leases option to extend lease term |  |  |  |  |  |  |  |  |  | 7 years |
Lease initial terms |  |  |  |  |  |  |  |  |  | 5 years |
Lease rent receivable |  |  |  |  |  |  |  |  | $ 5,700,000 |  |
Number of facilities leased | Facility |  |  |  |  |  |  |  |  | 2 |  |
Percentage of annual rental increase on cumulative and compound basis |  |  |  |  |  | 2.25% |  |  |  |  |
Lease Expiration Date |  |  |  |  |  |  |  |  |  | Dec. 31, 2033 |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  |  |  |  |  |  |  |  |  | true |
Relationship with Universal Health Realty Income Trust | Aiken Regional Medical Center and Canyon Creek Behavioral Health | Bonus Rental |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  | $ 0 |  |  |  |  |
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash received for sale of real estate asset |  |  |  |  |  |  |  |  |  | $ 4,100,000 |
Gain on sale of real estate assets |  |  |  |  |  |  |  |  |  | 68,400,000 |
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Inland Valley Campus of Southwest Healthcare System | Wildomar, California |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair market value of real estate assets received |  |  |  |  |  |  |  |  |  | 79,600,000 |
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Aiken Regional Medical Center | Aiken South Carolina |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair market value of real estate assets sold |  |  |  |  |  |  |  |  |  | $ 57,700,000 |
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Aiken Regional Medical Center | Aiken South Carolina | Behavioral Health Care Facility |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of beds available in acute care hospital | Bed |  |  |  |  |  |  |  |  |  | 62 |
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Aiken Regional Medical Center | Aiken South Carolina | Acute Care Hospital Services |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of beds available in acute care hospital | Bed |  |  |  |  |  |  |  |  |  | 211 |
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Canyon Creek Behavioral Health | Temple, Texas |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair market value of real estate assets sold |  |  |  |  |  |  |  |  |  | $ 26,000,000 |
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Aiken Regional Medical Center and Canyon Creek Behavioral Health |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair market value of real estate assets sold |  |  |  |  |  |  |  |  |  | $ 83,700,000 |
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 |  | $ 1,300,000 |  | 1,300,000 |  | $ 4,000,000.0 | 3,800,000 |  |  |  |
Premier, Inc. | Other (Income) Expense, Net |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend |  | $ 470,000 |  | $ 470,000 |  | 1,400,000 | $ 1,400,000 |  |  |  |
Premier, Inc. | Group Purchasing Organization Agreement | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares vesting period |  |  |  |  | 7 years |  |  |  |  |  |
Shares vesting period start year |  |  |  |  | 2014 |  |  |  |  |  |
Shares vesting period end year |  |  |  |  | 2020 |  |  |  |  |  |
Market value of retained vested shares |  |  |  |  |  | $ 48,000,000 |  |  | $ 78,000,000 |  |

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