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Commitments and Contingencies - Additional Information (Detail) | 1 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2015 Letters of Credit and Surety Bonds USD ($) | Nov. 30, 2010 Cygnet Health Care Limited Facility Patient | Mar. 31, 2015 Cygnet Health Care Limited GBP (£) | Nov. 30, 2010 Professional Liability Cygnet Health Care Limited GBP (£) | Nov. 30, 2010 General Liability Cygnet Health Care Limited GBP (£) | Mar. 31, 2015 Location 2 USD ($) | Mar. 31, 2015 Location 1 USD ($) | Mar. 31, 2015 Illinois USD ($) | Dec. 31, 2014 Illinois USD ($) | Mar. 31, 2015 Illinois Uncompensated Care Program Revenues USD ($) | Mar. 31, 2015 Illinois Disproportionate Share Hospital Program Revenues USD ($) | Mar. 31, 2015 Wind Storms Maximum USD ($) | Mar. 31, 2015 Wind Storms Minimum | Mar. 31, 2015 Earthquake USD ($) | Mar. 31, 2015 Earthquake Maximum USD ($) | Mar. 31, 2015 Earthquake UNITED STATES Maximum USD ($) | Mar. 31, 2015 Earthquake UNITED STATES Minimum | Mar. 31, 2015 Earthquake PUERTO RICO USD ($) | Mar. 31, 2015 Flood Location 2 USD ($) | Mar. 31, 2015 Flood Location 1 USD ($) | Nov. 30, 2010 Subsidiaries Professional Liability Maximum USD ($) | Nov. 30, 2010 Subsidiaries General Liability Maximum USD ($) | Mar. 31, 2015 Subsidiaries General and Professional Liability Insurance Policies | Mar. 31, 2015 Subsidiaries General and Professional Liability Insurance Policies Maximum USD ($) | Dec. 31, 2013 Subsidiaries General and Professional Liability Insurance Policies Maximum USD ($) | Mar. 31, 2015 Subsidiaries General and Professional Liability Insurance Policies Minimum USD ($) | Mar. 31, 2015 Psychiatric Solutions Inc General and Professional Liability Insurance Policies Maximum USD ($) | Oct. 31, 2012 Behavioral Health Facilities Acquired from Ascend Health Corporation General and Professional Liability Insurance Policies USD ($) | Mar. 31, 2015 Self Insurance Programs Letters of Credit and Surety Bonds USD ($) | Mar. 31, 2015 Other Debt Guarantees Letters of Credit and Surety Bonds USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | $ 190,000,000 us-gaap_SelfInsuranceReserve | $ 193,000,000 us-gaap_SelfInsuranceReserve |  |  |  | £ 10,000,000 us-gaap_SelfInsuranceReserve / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = us-gaap_ProfessionalMalpracticeLiabilityMember | £ 25,000,000 us-gaap_SelfInsuranceReserve / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = us-gaap_GeneralLiabilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 us-gaap_SelfInsuranceReserve / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = us-gaap_ProfessionalMalpracticeLiabilityMember | $ 3,000,000 us-gaap_SelfInsuranceReserve / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = us-gaap_GeneralLiabilityMember |  |  |  |  | $ 3,000,000 us-gaap_SelfInsuranceReserve / uhs_InsurancePoliciesAxis = uhs_GeneralAndProfessionalLiabilityInsurancePoliciesMember / dei_LegalEntityAxis = uhs_PsychiatricSolutionsIncMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 12,000,000 us-gaap_SelfInsuranceReserve / uhs_InsurancePoliciesAxis = uhs_GeneralAndProfessionalLiabilityInsurancePoliciesMember / dei_LegalEntityAxis = uhs_BehavioralHealthFacilitiesAcquiredFromAscendHealthCorporationMember |  |
Purchased several excess policies through commercial insurance carriers per occurrence |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 uhs_SelfInsuredAmountPerOccurrence / uhs_InsurancePoliciesAxis = uhs_GeneralAndProfessionalLiabilityInsurancePoliciesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 200,000,000 uhs_SelfInsuredAmountPerOccurrence / uhs_InsurancePoliciesAxis = uhs_GeneralAndProfessionalLiabilityInsurancePoliciesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Percentage of liability for claims paid under commercially insured coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%uhs_PercentageOfLiabilityForClaimsPaidUnderCommerciallyInsuredCoverage / uhs_InsurancePoliciesAxis = uhs_GeneralAndProfessionalLiabilityInsurancePoliciesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |
Liability for claims paid under commercially insured coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 uhs_LiabilityForClaimsPaidUnderCommerciallyInsuredCoverage / uhs_InsurancePoliciesAxis = uhs_GeneralAndProfessionalLiabilityInsurancePoliciesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 10,000,000 uhs_LiabilityForClaimsPaidUnderCommerciallyInsuredCoverage / uhs_InsurancePoliciesAxis = uhs_GeneralAndProfessionalLiabilityInsurancePoliciesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Minimum Insurance Deductible |  |  |  |  |  |  |  | 250,000 uhs_MinimumInsuranceDeductible / us-gaap_StatementGeographicalAxis = uhs_LocationTwoMember | 50,000 uhs_MinimumInsuranceDeductible / us-gaap_StatementGeographicalAxis = uhs_LocationOneMember |  |  |  |  |  |  | 250,000 uhs_MinimumInsuranceDeductible / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_EarthquakeMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 uhs_MinimumInsuranceDeductible / uhs_InsurancePoliciesAxis = uhs_GeneralAndProfessionalLiabilityInsurancePoliciesMember / dei_LegalEntityAxis = uhs_BehavioralHealthFacilitiesAcquiredFromAscendHealthCorporationMember |  |
Number of patients |  |  |  | 15 uhs_NumberOfPatients / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities |  |  |  | 17 uhs_NumberOfFacilities / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of nursing homes |  |  |  | 2 uhs_NumberOfNursingCentres / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability, current | 51,000,000 us-gaap_SelfInsuranceReserveCurrent | 51,000,000 us-gaap_SelfInsuranceReserveCurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation liability claims | 66,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | 67,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and related benefits | 32,000,000 us-gaap_DeferredCompensationLiabilityCurrent | 32,000,000 us-gaap_DeferredCompensationLiabilityCurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 us-gaap_LiabilityForCatastropheClaimsCarryingAmount / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = uhs_WindStormsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  | 250,000,000 us-gaap_LiabilityForCatastropheClaimsCarryingAmount / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_EarthquakeMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 100,000,000 us-gaap_LiabilityForCatastropheClaimsCarryingAmount / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_EarthquakeMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = country_US |  | 25,000,000 us-gaap_LiabilityForCatastropheClaimsCarryingAmount / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_EarthquakeMember / us-gaap_StatementGeographicalAxis = country_PR |  |  |  |  |  |  |  |  |  |  |  |
Percentage of insurance deductible |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%uhs_PercentageOfInsuranceDeductible / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = uhs_WindStormsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 3.00%uhs_PercentageOfInsuranceDeductible / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = uhs_WindStormsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  | 5.00%uhs_PercentageOfInsuranceDeductible / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_EarthquakeMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = country_US | 1.00%uhs_PercentageOfInsuranceDeductible / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_EarthquakeMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementGeographicalAxis = country_US |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum insurance deductible |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 uhs_LossContingencyEstimateOfPossibleLossMaximumInsuranceDeductible / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_EarthquakeMember / us-gaap_StatementGeographicalAxis = country_PR | 250,000 uhs_LossContingencyEstimateOfPossibleLossMaximumInsuranceDeductible / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_FloodMember / us-gaap_StatementGeographicalAxis = uhs_LocationTwoMember | 500,000 uhs_LossContingencyEstimateOfPossibleLossMaximumInsuranceDeductible / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_FloodMember / us-gaap_StatementGeographicalAxis = uhs_LocationOneMember |  |  |  |  |  |  |  |  |  |
Property insurance |  |  |  |  | 180,000,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 1,383,964,000 us-gaap_AccountsReceivableNetCurrent | 1,282,735,000 us-gaap_AccountsReceivableNetCurrent |  |  |  |  |  |  |  | 42,000,000 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementGeographicalAxis = stpr_IL | 44,000,000 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementGeographicalAxis = stpr_IL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable net greater than sixty days Past due |  |  |  |  |  |  |  |  |  | 22,000,000 uhs_AccountsReceivableNetGreaterThanSixtyDaysPastDue / us-gaap_StatementGeographicalAxis = stpr_IL | 23,000,000 uhs_AccountsReceivableNetGreaterThanSixtyDaysPastDue / us-gaap_StatementGeographicalAxis = stpr_IL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  | 105,000,000 us-gaap_AccountsReceivableNet / us-gaap_StatementGeographicalAxis = stpr_IL | 102,000,000 us-gaap_AccountsReceivableNet / us-gaap_StatementGeographicalAxis = stpr_IL | 61,000,000 us-gaap_AccountsReceivableNet / us-gaap_IncomeStatementLocationAxis = uhs_RevenueOneMember / us-gaap_StatementGeographicalAxis = stpr_IL | 44,000,000 us-gaap_AccountsReceivableNet / us-gaap_IncomeStatementLocationAxis = uhs_RevenueTwoMember / us-gaap_StatementGeographicalAxis = stpr_IL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Off-balance sheet contingent obligation |  |  | $ 114,000,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_ShortTermDebtTypeAxis = uhs_LettersOfCreditAndSuretyBondsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 93,000,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = uhs_SelfInsuranceProgramsMember / us-gaap_ShortTermDebtTypeAxis = uhs_LettersOfCreditAndSuretyBondsMember | $ 21,000,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = uhs_OtherDebtGuaranteesMember / us-gaap_ShortTermDebtTypeAxis = uhs_LettersOfCreditAndSuretyBondsMember
Payment suspension period increased | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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