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Supplemental Condensed Consolidating Financial Information - Additional Information (Detail) | Dec. 31, 2015
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Guarantors |
Supplementary Information [Line Items] |
Percentage of ownership interests | 100.00%

X
- Definition Percentage of ownership interests. + References No definition available. + Details
Name: | uhs_PercentageOfOwnershipInterests
Namespace Prefix: | uhs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Supplementary information. + References No definition available. + Details
Name: | uhs_SupplementaryInformationLineItems
Namespace Prefix: | uhs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_GuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |