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Acquisitions and Divestitures - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 Facility | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Dec. 31, 2012 | Nov. 30, 2010 Facility | Sep. 30, 2014 Bed Hospital Facility | Jun. 30, 2014 Bed | Mar. 31, 2014 Bed | Dec. 31, 2014 Bed | Feb. 28, 2015 Bed
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of hospitals | 3 uhs_NumberOfHospitalFacilities |  |  |  |  |  |  |  |  |  |
Aggregate cash proceeds from divestiture of businesses | $ 15,000,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested |  |  |  |  |  |  |  |  |  |
Aggregate pre-tax net gain on the divestiture |  | 3,080,000 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 26,419,000 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax |  |  |  |  |  |  |  |
Auburn Regional Medical Center |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate pre-tax net gain on the divestiture |  |  | 26,000,000 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_ProductOrServiceAxis = uhs_AuburnRegionalMedicalCenterMember |  |  |  |  |  |  |  |
2012 Divestiture of Assets and Businesses |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from divestiture of assets and businesses |  |  | 149,000,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember |  |  |  |  |  |  |  |
2012 Divestiture of Assets and Businesses | Peak Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of beds |  |  | 104 uhs_NumberOfAvailableBeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_PeakBehavioralHealthServicesMember |  | 104 uhs_NumberOfAvailableBeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_PeakBehavioralHealthServicesMember |  |  |  |  |  |
2012 Divestiture of Assets and Businesses | Hospital San Juan Capestrano |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from divestiture of assets and businesses |  |  | 50,000,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_HospitalSanJuanCapestranoMember |  |  |  |  |  |  |  |
Number of acute care hospital beds included in acquisition |  |  | 108 uhs_NumberOfAcuteCareHospitalBedsIncludedInAcquisition / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_HospitalSanJuanCapestranoMember |  |  |  |  |  |  |  |
2012 Divestiture of Assets and Businesses | Auburn Regional Medical Center |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from divestiture of assets and businesses |  |  | 93,000,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_AuburnRegionalMedicalCenterMember |  |  |  |  |  |  |  |
Number of acute care hospital beds included in acquisition |  |  | 159 uhs_NumberOfAcuteCareHospitalBedsIncludedInAcquisition / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_AuburnRegionalMedicalCenterMember |  |  |  |  |  |  |  |
2012 Divestiture of Assets and Businesses | Behavioral Health Care Facility |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from divestiture of assets and businesses |  |  | 6,000,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_BehavioralHealthCareFacilityMember |  |  |  |  |  |  |  |
Number of non-operating behavioral health facilities |  |  | 2 uhs_HealthcareFacilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_BehavioralHealthCareFacilityMember |  | 2 uhs_HealthcareFacilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandTwelveDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_BehavioralHealthCareFacilityMember |  |  |  |  |  |
Two Thousand Thirteen Divestiture of Assets and Businesses | Peak Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from divestiture of assets and businesses |  | 37,000,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandThirteenDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_PeakBehavioralHealthServicesMember |  | 24,000,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandThirteenDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_PeakBehavioralHealthServicesMember |  |  |  |  |  |  |
Aggregate pre-tax net gain on the divestiture |  | 3,000,000 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandThirteenDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_PeakBehavioralHealthServicesMember |  | 3,000,000 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = uhs_TwoThousandThirteenDivestitureOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_PeakBehavioralHealthServicesMember |  |  |  |  |  |  |
2013 Acquisitions of Assets and Businesses |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition, cash paid |  | 13,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandThirteenAcquisitionsMember |  |  |  |  |  |  |  |  |
Pro forma net revenues |  | 7,620,000,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandThirteenAcquisitionsMember |  |  |  |  |  |  |  |  |
Pro forma net income attributable to UHS |  | 522,000,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandThirteenAcquisitionsMember |  |  |  |  |  |  |  |  |
Pro forma net income attributable to UHS per diluted share |  | $ 5.25 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandThirteenAcquisitionsMember |  |  |  |  |  |  |  |  |
2012 Acquisitions of Assets and Businesses |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition, cash paid |  |  | 528,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |  |  |  |  |  |  |
Net revenues |  |  |  |  | 42,000,000 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |  |  |  |  |
Pro forma net revenues |  |  | 7,110,000,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |  |  |  |  |  |  |
Pro forma net income attributable to UHS |  |  | 464,000,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |  |  |  |  |  |  |
Pro forma net income attributable to UHS per diluted share |  |  | $ 4.74 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |  |  |  |  |  |  |
2012 Acquisitions of Assets and Businesses | Ascend Health Corporation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition, cash paid |  |  | 503,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_AscendHealthCorporationMember |  |  |  |  |  |  |  |
2012 Acquisitions of Assets and Businesses | Physician Practices and Various Real Property |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition, cash paid |  |  | 25,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember / us-gaap_ProductOrServiceAxis = uhs_PhysicianPracticeMember |  |  |  |  |  |  |  |
2014 Acquisitions of Assets and Businesses |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition, cash paid | 431,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |  |  |  |  |  |  |  |  |  |
Pro forma net revenues | 8,280,000,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |  |  |  |  |  |  |  |  |  |
Pro forma net income attributable to UHS | 558,000,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |  |  |  |  |  |  |  |  |  |
Pro forma net income attributable to UHS per diluted share | $ 5.55 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |  |  |  |  |  |  |  |  |  |
Cygnet Health Care Limited |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of beds |  |  |  |  |  |  | 723 uhs_NumberOfBedsAvailableInAcquiredHospitalInBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |
Number of facilities |  |  |  |  |  | 18 uhs_NumberOfFacilities / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember | 17 uhs_NumberOfFacilities / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |
Number of hospitals |  |  |  |  |  |  | 15 uhs_NumberOfHospitalFacilities / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |
Number of nursing homes |  |  |  |  |  | 2 uhs_NumberOfNursingCentres / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember | 2 uhs_NumberOfNursingCentres / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |
Net revenues | $ 175,000,000 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |  |  |  |  |  |  |
Psychiatric Institute |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of beds |  |  |  |  |  |  |  | 124 uhs_NumberOfBedsAvailableInAcquiredHospitalInBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = uhs_AcquiredCompanyTwoMember |  |  |
Palo Verde Behavioral Health |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of beds |  |  |  |  |  |  |  |  | 48 uhs_NumberOfBedsAvailableInAcquiredHospitalInBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = uhs_AcquiredCompanyThreeMember |  |
The Bridgeway |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of beds |  |  |  |  |  |  |  |  |  | 103 uhs_NumberOfBedsAvailableInAcquiredHospitalInBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = uhs_AcquiredCompanyFourMember |
Cygnet Hospital-Harrow |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of beds |  |  |  |  |  |  |  |  |  | 44 uhs_NumberOfBedsAvailableInAcquiredHospitalInBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = uhs_AcquiredCompanyFiveMember |
Cygnet Hospital-Taunton | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of beds |  |  |  |  |  |  |  |  |  |  | 46 uhs_NumberOfBedsAvailableInAcquiredHospitalInBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = uhs_AcquiredCompanySixMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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