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Commitments and Contingencies - Additional Information (Detail) | 1 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  | 12 Months Ended
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Aug. 31, 2014 | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Nov. 30, 2010 Cygnet Health Care Limited Facility Patient | Sep. 30, 2014 Cygnet Health Care Limited Facility | Dec. 31, 2014 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 (£) | Dec. 31, 2014 Location 2 USD ($) | Dec. 31, 2014 Location 1 USD ($) | Dec. 31, 2014 Wind Storms Maximum USD ($) | Dec. 31, 2014 Wind Storms Minimum | Dec. 31, 2014 Earthquake USD ($) | Dec. 31, 2014 Earthquake Maximum USD ($) | Dec. 31, 2014 Earthquake UNITED STATES Maximum USD ($) | Dec. 31, 2014 Earthquake UNITED STATES Minimum | Dec. 31, 2014 Earthquake PUERTO RICO USD ($) | Dec. 31, 2014 Flood Location 2 USD ($) | Dec. 31, 2014 Flood Location 1 USD ($) | Nov. 30, 2010 Subsidiaries Professional Liability Maximum USD ($) | Nov. 30, 2010 Subsidiaries General Liability Maximum USD ($) | Dec. 31, 2014 Subsidiaries General and Professional Liability Insurance Policies | Dec. 31, 2014 Subsidiaries General and Professional Liability Insurance Policies Maximum USD ($) | Dec. 31, 2013 Subsidiaries General and Professional Liability Insurance Policies Maximum USD ($) | Dec. 31, 2014 Subsidiaries General and Professional Liability Insurance Policies Minimum USD ($) | Dec. 31, 2014 Psychiatric Solutions Inc General and Professional Liability Insurance Policies Maximum USD ($) | Oct. 31, 2012 Behavioral Health Facilities Acquired from Ascend Health Corporation General and Professional Liability Insurance Policies USD ($) | Dec. 31, 2014 Revenue Cycle Data Processing Services USD ($) | Dec. 31, 2014 Electronic Health Records Application USD ($) | Dec. 31, 2014 Estimated Minimum Liabilities For Physician Commitments USD ($) | Dec. 31, 2014 Construction Commitment USD ($) | Dec. 31, 2014 Related to Certain Equipment USD ($) | Dec. 31, 2014 Commercial Health Insurer and Self-insured Employee Benefit Plans USD ($) | Dec. 31, 2014 Professional And General Liability Psi Subsidiaries USD ($) | Dec. 31, 2013 Professional And General Liability Psi Subsidiaries USD ($) | Dec. 31, 2012 Professional And General Liability Psi Subsidiaries USD ($) | Dec. 31, 2011 Professional And General Liability Psi Subsidiaries
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  | $ 193,000,000 us-gaap_SelfInsuranceReserve | $ 206,000,000 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 |  |  |  | 16 uhs_NumberOfPatients / 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 nursing homes |  |  |  | 2 uhs_NumberOfNursingCentres / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember | 2 uhs_NumberOfNursingCentres / us-gaap_BusinessAcquisitionAxis = uhs_CygnetHealthCareLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability, current |  | 51,000,000 us-gaap_SelfInsuranceReserveCurrent | 44,000,000 us-gaap_SelfInsuranceReserveCurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in professional and general liability self-insurance reserves relating to prior years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 uhs_ReductionInProfessionalAndGeneralLiabilitySelfInsuranceReservesRelatingToPriorYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = uhs_ProfessionalAndGeneralLiabilityMember / us-gaap_StatementBusinessSegmentsAxis = uhs_PsiSubsidiariesMember | 81,000,000 uhs_ReductionInProfessionalAndGeneralLiabilitySelfInsuranceReservesRelatingToPriorYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = uhs_ProfessionalAndGeneralLiabilityMember / us-gaap_StatementBusinessSegmentsAxis = uhs_PsiSubsidiariesMember | 27,000,000 uhs_ReductionInProfessionalAndGeneralLiabilitySelfInsuranceReservesRelatingToPriorYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = uhs_ProfessionalAndGeneralLiabilityMember / us-gaap_StatementBusinessSegmentsAxis = uhs_PsiSubsidiariesMember |
Weighting given to company-specific metrics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%uhs_WeightingGivenToCompanySpecificMetrics / us-gaap_LossContingenciesByNatureOfContingencyAxis = uhs_ProfessionalAndGeneralLiabilityMember / us-gaap_StatementBusinessSegmentsAxis = uhs_PsiSubsidiariesMember | 75.00%uhs_WeightingGivenToCompanySpecificMetrics / us-gaap_LossContingenciesByNatureOfContingencyAxis = uhs_ProfessionalAndGeneralLiabilityMember / us-gaap_StatementBusinessSegmentsAxis = uhs_PsiSubsidiariesMember
General industry metrics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00%uhs_GeneralIndustryMetrics / us-gaap_LossContingenciesByNatureOfContingencyAxis = uhs_ProfessionalAndGeneralLiabilityMember / us-gaap_StatementBusinessSegmentsAxis = uhs_PsiSubsidiariesMember | 25.00%uhs_GeneralIndustryMetrics / us-gaap_LossContingenciesByNatureOfContingencyAxis = uhs_ProfessionalAndGeneralLiabilityMember / us-gaap_StatementBusinessSegmentsAxis = uhs_PsiSubsidiariesMember
Compensation liability claims |  | 67,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | 64,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and related benefits |  | 32,000,000 us-gaap_DeferredCompensationLiabilityCurrent | 34,000,000 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment suspension period increased | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined estimated future purchase obligations |  | 205,000,000 us-gaap_RecordedUnconditionalPurchaseObligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,000,000 us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_ProductOrServiceAxis = uhs_RevenueCycleDataProcessingServicesMember | 117,000,000 us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_ProductOrServiceAxis = uhs_ElectronicHealthRecordsApplicationMember | 2,000,000 us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_ProductOrServiceAxis = uhs_EstimatedMinimumLiabilitiesForPhysicianCommitmentsMember | 151,000,000 us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_ProductOrServiceAxis = us-gaap_ConstructionInProgressMember | 251,000,000 us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_ProductOrServiceAxis = uhs_EquipmentAndOtherRelatedMember | 58,000,000 us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_ProductOrServiceAxis = uhs_CommercialHealthInsurancePayorsMember |  |  |  |
Defined benefit pension plan estimated payments through 2089 |  | 234,000,000 us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other retirement plan liabilities |  | $ 17,000,000 us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This represents the entire liability recognized in the balance sheet that is associated with other postretirement defined benefit plans (excluding pension plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of property-casualty insurance premium revenue earned on insurance policies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 + Details
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