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Business and Summary of Significant Accounting Policies - Additional Information (Detail) shares in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Dec. 31, 2020 USD ($) Facility | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2013 | Dec. 31, 2020 USD ($) Hospital Facility shares | Dec. 31, 2019 USD ($) Hospital shares | Dec. 31, 2018 USD ($) Hospital Facility shares | Dec. 31, 2015 USD ($)
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of change on after-tax net income |  | $ 307,734,000 | $ 244,092,000 | $ 256,504,000 | $ 144,460,000 | $ 248,010,000 | $ 100,870,000 | $ 241,265,000 | $ 237,398,000 |  | $ 952,790,000 | $ 827,543,000 | $ 797,883,000 |
Number of hospital facilities | Hospital |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Capitalized interest |  |  |  |  |  |  |  |  |  |  | $ 4,300,000 | 3,400,000 | 2,300,000 |
Depreciation expense |  |  |  |  |  |  |  |  |  |  | 478,800,000 | 455,600,000 | 410,000,000.0 |
Impairment of goodwill or indefinite-lived intangible assets | $ 0 |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Impairment of other and intangible assets | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for asset impairment |  |  |  |  |  |  |  |  |  |  | 0 | 97,631,000 | $ 49,310,000 |
Intangible assets net |  | $ 82,586,000 |  |  |  | 83,657,000 |  |  |  |  | $ 82,586,000 | $ 83,657,000 |  |
Number of inpatient facilities | Facility |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Number of outpatient facilities | Facility |  |  |  |  |  |  |  |  |  |  |  |  | 12 |
Behavioral health care facilities with outside owners holding non-controlling minority interest | Facility |  | 3 |  |  |  |  |  |  |  |  | 3 |  |  |
Redeemable non-controlling interest balances |  | $ 5,000,000 |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
Non-controlling interest balances |  | 85,000,000 |  |  |  |  |  |  |  |  | 85,000,000 |  |  |
Cash flow hedges |  | 0 |  |  |  |  |  |  |  |  | $ 0 |  |  |
Anti-dilutive weighted average stock options excluded from computation of earnings per share | shares |  |  |  |  |  |  |  |  |  |  | 6.4 | 5.5 | 7.9 |
Revenues |  | 3,086,935,000 | $ 2,912,541,000 | $ 2,729,754,000 | $ 2,829,667,000 | 2,896,247,000 | $ 2,822,453,000 | $ 2,855,168,000 | $ 2,804,391,000 |  | $ 11,558,897,000 | $ 11,378,259,000 | $ 10,772,278,000 |
CARES Act and other Governmental grants and Medicare accelerated payments received |  | 1,112,000,000 |  |  |  |  |  |  |  |  | 1,112,000,000 |  |  |
Revenues from grants |  |  |  |  |  |  |  |  |  |  | 413,000,000 |  |  |
Deferred revenues from grants |  | 4,000,000 |  |  |  |  |  |  |  |  | 4,000,000 |  |  |
Medicare accelerated payments received | 323,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Medicare accelerated payments and deferred CARES Act and other grants | 372,000,000 | 376,151,000 |  |  |  | 0 |  |  |  |  | 376,151,000 | 0 |  |
Public Health and Social Services Emergency Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Governmental grants received by CARES Act |  | 417,000,000 |  |  |  |  |  |  |  |  | 417,000,000 |  |  |
Medicare Accelerated and Advance Payment Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Medicare accelerated payments received | $ 695,000,000 |  |  |  |  |  |  |  |  |  | $ 695,000,000 |  |  |
Repayment period of Medicare accelerated payments received |  |  |  |  |  |  |  |  |  |  | beginning in the second quarter of 2021 through the third quarter of 2022 |  |  |
Tradename |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets net |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 | $ 124,000,000
Foundations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for asset impairment |  |  |  |  |  |  |  |  |  |  |  | 98,000,000 | $ 49,000,000 |
Impairment provision for tradename intangible asset |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |
Impairment charges for real property assets |  |  |  |  |  |  |  |  |  |  |  | 23,000,000 |  |
Commercial Insurance Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutorily required capital reserves |  | 73,000,000 |  |  |  | 62,000,000 |  |  |  |  | $ 73,000,000 | $ 62,000,000 |  |
Universal Health Realty Income Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of hospital facilities | Hospital |  |  |  |  |  |  |  |  |  |  | 3 | 3 | 3 |
Investments |  | 5,000,000 |  |  |  | 6,000,000 |  |  |  |  | $ 5,000,000 | $ 6,000,000 |  |
Premier, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | $ 78,000,000 |  |  |  | $ 70,000,000 |  |  |  |  | 78,000,000 | 70,000,000 |  |
Premier, Inc. | Group Purchasing Organization Agreement | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [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 |  |  |  |  |  |  |  |  |  |  | 78,000,000 | 70,000,000 |  |
Unrealized gain (loss) |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |
Additional vested shares, value |  |  |  |  |  |  |  |  |  |  | 12,000,000 | 12,000,000 |  |
Acute Care Hospital Services |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 6,337,304,000 | 6,164,560,000 | $ 5,719,905,000 |
Acute Care Hospital Services | Las Vegas, Nevada |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of hospital facilities | Hospital |  |  |  |  |  |  |  |  |  |  | 6 |  |  |
Acute Care Facility | Washington, District of Columbia | Outside Owners |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  | 20.00% |  |  |  |  |  |  |  |  | 20.00% |  |  |
Acute Care Facility | Texas | Outside Owners |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  | 11.00% |  |  |  |  |  |  |  |  | 11.00% |  |  |
Acute Care Facility | Nevada | Outside Owners |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  | 5.00% |  |  |  |  |  |  |  |  | 5.00% |  |  |
Behavioral Health Care Facility | Pennsylvania | Outside Owners |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  | 20.00% |  |  |  |  |  |  |  |  | 20.00% |  |  |
Behavioral Health Care Facility | Ohio | Outside Owners |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  | 30.00% |  |  |  |  |  |  |  |  | 30.00% |  |  |
Behavioral Health Care Facility | Washington | Outside Owners |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  | 20.00% |  |  |  |  |  |  |  |  | 20.00% |  |  |
State Medicaid programs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue offset amount |  |  |  |  |  |  |  |  |  |  | $ 185,000,000 | 194,000,000 | 179,000,000 |
Net aggregate benefit |  |  |  |  |  |  |  |  |  |  | 303,000,000 | 225,000,000 | 208,000,000 |
Net revenues |  |  |  |  |  |  |  |  |  |  | $ 73,000,000 | $ 78,000,000 | $ 64,000,000 |
Net Revenue | Las Vegas, Nevada | Geographic Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue |  |  |  |  |  |  |  |  |  |  | 15.00% | 16.00% | 15.00% |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patients treated at hospitals for non elective services gross income federal poverty guidelines |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |
Minimum | Building and Building Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful lives |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Minimum | Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful lives |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patients treated at hospitals for non elective services gross income federal poverty guidelines |  |  |  |  |  |  |  |  |  |  | 400.00% |  |  |
Maximum | Building and Building Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful lives |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |
Maximum | Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful lives |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |
Medicare |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 1,690,591,000 | $ 1,889,245,000 | $ 1,875,875,000 |
Medicare | Acute Care Hospital Services |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 1,242,268,000 | 1,336,200,000 | 1,296,152,000 |
Health Care | State Medicaid programs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 488,000,000 | $ 419,000,000 | $ 387,000,000 |
ASU 2014-09 | Revision of Prior Period Change in Accounting Principle Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of change on after-tax net income |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
ASU 2014-09 | Medicare |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of estimated net revenue adjustment |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% | 1.00% |
ASU 2016-01 | Premier, Inc. | Other (Income) Expense, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) |  |  |  |  |  |  |  |  |  |  | $ (4,000,000) | $ (4,000,000) |  |
Payments of cash dividends |  |  |  |  |  |  |  |  |  |  | $ 848,000 |  |  |

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