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Uncompensated Care (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Health Care Trust Fund [Line Items] |  |  |
Total uncompensated care | $ 2,184,064 | $ 1,894,594 | $ 1,768,401
Uncompensated care, percentage | 100.00% | 100.00% | 100.00%
Charity Care |  |  |
Health Care Trust Fund [Line Items] |  |  |
Total uncompensated care | $ 672,326 | $ 761,783 | $ 887,136
Uncompensated care, percentage | 31.00% | 40.00% | 50.00%
Uninsured Discounts |  |  |
Health Care Trust Fund [Line Items] |  |  |
Total uncompensated care | $ 1,511,738 | $ 1,132,811 | $ 881,265
Uncompensated care, percentage | 69.00% | 60.00% | 50.00%

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- Definition Percentage of uncompensated care. + References No definition available. + Details
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Namespace Prefix: | uhs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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: | us-gaap_HealthCareTrustFundAxis=uhs_UninsuredDiscountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |