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Relationship with Universal Health Realty Income Trust and Related Party Transactions - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Hospital Facility | Sep. 30, 2020 USD ($) Hospital | Dec. 31, 2013 | Sep. 30, 2021 USD ($) Hospital Bed Lease Facility | Sep. 30, 2020 USD ($) Hospital | Dec. 31, 2020 USD ($) | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net revenues | $ 3,155,999,000 | $ 2,912,541,000 |  | $ 9,366,866,000 | $ 8,471,962,000 |  |  |
Number of hospital facilities | Hospital |  |  |  | 3 |  |  |  |
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 |  | $ 1,100,000 |  |
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] |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Lease initial terms | 10 years |  |  | 10 years |  |  |  |
Relationship with Universal Health Realty Income Trust |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Trust outstanding shares held, percentage | 5.70% |  |  | 5.70% |  |  |  |
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 | $ 276,000 | 300,000 |  | $ 977,000 | $ 800,000 |  |  |
Dividends received from the Trust | 552,000 | 543,000 |  | 1,700,000 | 1,600,000 |  |  |
Carrying value of investment in Trust | 4,700,000 |  |  | 4,700,000 |  | $ 5,400,000 |  |
Market value of investment in Trust | 43,500,000 |  |  | $ 43,500,000 |  | 50,600,000 |  |
Lease renewal period, years |  |  |  | 5 years |  |  |  |
Rent expense under operating leases | $ 4,000,000 | $ 4,000,000 |  | $ 13,000,000 | $ 12,000,000 |  |  |
Notice period on renewal of lease |  |  |  | 90 days |  |  |  |
Period of rights of refusal to leased facilities |  |  |  | 180 days |  |  |  |
Number of hospital facilities | Hospital | 3 | 3 |  | 3 | 3 |  |  |
Number of free-standing emergency departments to be acquired | Facility | 2 |  |  | 2 |  |  |  |
Relationship with Universal Health Realty Income Trust | Behavioral Health Care Facility |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Lease initial terms | 20 years |  |  | 20 years |  |  |  |
Lease renewal period, years |  |  |  | 10 years |  |  |  |
Number of triple net lease | Lease |  |  |  | 5 |  |  |  |
Relationship with Universal Health Realty Income Trust | Clive, Iowa. | Behavioral Health Care Facility |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of bed available in behavioral health care facility | Bed |  |  |  | 100 |  |  |  |
Relationship with Universal Health Realty Income Trust | Minimum |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Lease initial terms | 13 years |  |  | 13 years |  |  |  |
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 |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Lease initial terms | 15 years |  |  | 15 years |  |  |  |
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 | Advisory Fee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net revenues | $ 1,100,000 | $ 1,000,000.0 |  | $ 3,300,000 | $ 3,100,000 |  |  |
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 |  |  |  | 87,000,000 |  | $ 78,000,000 |  |
Premier, Inc. | Other (Income) Expense, Net |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Dividend | $ 400,000 | $ 400,000 |  | $ 1,300,000 | $ 400,000 |  |  |

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