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Relationship with Universal Health Realty Income Trust and Related Party Transactions - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2015 | Sep. 30, 2014
Related Party Transaction [Line Items] |  |  |  |  |
Lease renewal period, years | 5 uhs_LeaseRenewalPeriod |  |  |  |
Notice period on renewal of lease | 90 uhs_NoticePeriodOnRenewalOfLease |  |  |  |
Period of rights of refusal to leased facilities | 180 uhs_PeriodOfRightsOfRefusalToLeasedFacilities |  |  |  |
Chief Executive Officer |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Estimated payments to acquire life insurance policies | $ 25,000,000 uhs_EstimatedPaymentsToAcquireLifeInsurancePolicies / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |  |  |
Payments to acquire life insurance policies | 1,300,000 us-gaap_PaymentsToAcquireLifeInsurancePolicies / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 1,300,000 us-gaap_PaymentsToAcquireLifeInsurancePolicies / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 1,400,000 us-gaap_PaymentsToAcquireLifeInsurancePolicies / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |
Chief Executive Officer | Trust Owned by Chief Executive Officer |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Estimated payments to acquire life insurance policies | 8,000,000 uhs_EstimatedPaymentsToAcquireLifeInsurancePolicies / dei_LegalEntityAxis = uhs_TrustOwnedByChiefExecutiveOfficerMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |  |  |
Minimum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Lease initial terms | 13 uhs_LeaseInitialTerms / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Minimum | Chief Executive Officer |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Estimated death benefit proceeds | 33,000,000 uhs_EstimatedProceedsFromLifeInsurancePolicies / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |  |  |
Maximum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Lease initial terms | 15 uhs_LeaseInitialTerms / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Relationship with Universal Health Realty Income Trust |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Trust outstanding shares held, percentage | 5.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember |  |  |  |
Advisory fee earned | 2,500,000 us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember | 2,400,000 us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember | 2,100,000 us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember |  |
Pre-tax share of income from the Trust | 3,200,000 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember | 842,000 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember | 1,200,000 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember |  |
Share of gain on fair value recognition included in the share of trust | 2,300,000 uhs_ShareOfIncomeIncludedInShareOfTrust / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember |  | 500,000 uhs_ShareOfIncomeIncludedInShareOfTrust / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember |  |
Carrying value of investment in Trust | 9,300,000 us-gaap_EquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember | 8,100,000 us-gaap_EquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember |  |  |
Market value of investment in Trust | 37,900,000 us-gaap_EquityMethodInvestmentQuotedMarketValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember | 31,500,000 us-gaap_EquityMethodInvestmentQuotedMarketValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember |  |  |
Rent expense under operating leases | 16,800,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember | 16,400,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember | 16,300,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember |  |
Non-controlling ownership interests by subsidiaries | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember |  |  |  |
Estimated purchase price of The Bridgeway's real property |  |  |  |  | 17,300,000 us-gaap_PurchaseOptionsLand / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember
Relationship with Universal Health Realty Income Trust | Scenario, Forecast |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Aggregate construction cost/sales proceeds |  |  |  | 12,800,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Aggregate rent expense paid |  |  |  | $ 900,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Relationship with Universal Health Realty Income Trust | Scenario, Forecast | Texas |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of free-standing emergency departments to be acquired |  |  |  | 2 uhs_NumberOfFreestandingEmergencyDepartmentsToBeAcquiredInBusinessAcquisition / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhs_UniversalHealthRealtyIncomeTrustMember / us-gaap_StatementGeographicalAxis = stpr_TX / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |

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