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Relationship with Universal Health Realty Income Trust and Related Party Transactions - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]      
Lease renewal period, years 5uhs_LeaseRenewalPeriod    
Notice period on renewal of lease 90uhs_NoticePeriodOnRenewalOfLease    
Period of rights of refusal to leased facilities 180uhs_PeriodOfRightsOfRefusalToLeasedFacilities    
Minimum      
Related Party Transaction [Line Items]      
Lease initial terms 13uhs_LeaseInitialTerms
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum      
Related Party Transaction [Line Items]      
Lease initial terms 15uhs_LeaseInitialTerms
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Chief Executive Officer      
Related Party Transaction [Line Items]      
Estimated payments to acquire life insurance policies $ 25,000,000uhs_EstimatedPaymentsToAcquireLifeInsurancePolicies
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
   
Payments to acquire life insurance policies     1,300,000us-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 8,000,000uhs_EstimatedPaymentsToAcquireLifeInsurancePolicies
/ dei_LegalEntityAxis
= uhs_TrustOwnedByChiefExecutiveOfficerMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
   
Chief Executive Officer | Minimum      
Related Party Transaction [Line Items]      
Estimated death benefit proceeds 33,000,000uhs_EstimatedProceedsFromLifeInsurancePolicies
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
   
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 700,000us-gaap_InvestmentAdvisoryFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
600,000us-gaap_InvestmentAdvisoryFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
 
Pre-tax share of income from the Trust 200,000us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
300,000us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
 
Carrying value of investment in Trust 9,000,000us-gaap_EquityMethodInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
  9,300,000us-gaap_EquityMethodInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
Market value of investment in Trust 44,300,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
  37,900,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
Aggregate construction cost/sales proceeds 13,000,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
   
Aggregate rent expense paid 900,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
  1,100,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
Estimated purchase price of The Bridgeway's real property     17,300,000us-gaap_PurchaseOptionsLand
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
Rent expense under operating leases $ 4,000,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
$ 4,000,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
 
Non-controlling ownership interests by subsidiaries 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
   
Relationship with Universal Health Realty Income Trust | Texas      
Related Party Transaction [Line Items]      
Number of free-standing emergency departments to be acquired 2uhs_NumberOfFreestandingEmergencyDepartmentsToBeAcquiredInBusinessAcquisition
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhs_UniversalHealthRealtyIncomeTrustMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX