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Estimated Cost of Providing Uncompensated Care (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Health Care Trust Funds [Line Items] |  |  |
Estimated cost of providing uncompensated care | $ 260,589 | $ 245,556 | $ 217,633
Charity Care |  |  |
Health Care Trust Funds [Line Items] |  |  |
Estimated cost of providing uncompensated care | 83,383 | 85,434 | 72,095
Uninsured Discounts |  |  |
Health Care Trust Funds [Line Items] |  |  |
Estimated cost of providing uncompensated care | $ 177,206 | $ 160,122 | $ 145,538

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- Definition Estimated cost of uncompensated care. + References No definition available. + Details
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Namespace Prefix: | uhs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Health care trust funds. + References No definition available. + Details
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Namespace Prefix: | uhs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=uhs_UninsuredDiscountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |