XML 96 R80.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Schedule of Measurement Dates (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Benefit Obligation |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Measurement Dates | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Of Plan Assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Measurement Dates | Dec. 31, 2018 | Dec. 31, 2017

X
- Definition Month-end measurement date applicable when an accounting policy election is made to measure plan assets and benefit obligations as of the month-end that is closest to the fiscal year-end, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (u) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAccountingPolicyElectionMeasurementDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=uhs_BenefitObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=uhs_FairValueOfPlanAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |