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Remaining Renewal Options and Terms for Hospital Facilities Leased from Trust (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
RenewalOptions
McAllen Medical Center  
Property Subject to or Available for Operating Lease [Line Items]  
Number of renewal options at existing lease rates 3uhs_OperatingLeasesNumberOfRenewalOptionsAtExistingLeaseRates
/ us-gaap_MajorPropertyClassAxis
= uhs_McAllenMedicalCenterMember
Renewal options term at existing lease rates 5 years
Wellington Regional Medical Center  
Property Subject to or Available for Operating Lease [Line Items]  
Number of renewal options at existing lease rates 1uhs_OperatingLeasesNumberOfRenewalOptionsAtExistingLeaseRates
/ us-gaap_MajorPropertyClassAxis
= uhs_WellingtonRegionalMedicalCenterMember
Renewal options term at existing lease rates 5 years
Number of renewal options at fair market lease rates 2uhs_OperatingLeasesNumberOfRenewalOptionsAtFairMarketValueLeaseRates
/ us-gaap_MajorPropertyClassAxis
= uhs_WellingtonRegionalMedicalCenterMember
Renewal options term at fair market lease rates 5 years
Southwest Healthcare System, Inland Valley Campus  
Property Subject to or Available for Operating Lease [Line Items]  
Number of renewal options at existing lease rates 1uhs_OperatingLeasesNumberOfRenewalOptionsAtExistingLeaseRates
/ us-gaap_MajorPropertyClassAxis
= uhs_SouthwestHealthcareSystemInlandValleyCampusMember
Renewal options term at existing lease rates 5 years
Number of renewal options at fair market lease rates 2uhs_OperatingLeasesNumberOfRenewalOptionsAtFairMarketValueLeaseRates
/ us-gaap_MajorPropertyClassAxis
= uhs_SouthwestHealthcareSystemInlandValleyCampusMember
Renewal options term at fair market lease rates 5 years
Maximum | McAllen Medical Center  
Property Subject to or Available for Operating Lease [Line Items]  
Renewal options at existing lease rates expiration year 2031
Maximum | Wellington Regional Medical Center  
Property Subject to or Available for Operating Lease [Line Items]  
Renewal options at existing lease rates expiration year 2021
Renewal options at fair market value lease rates expiration year 2031
Maximum | Southwest Healthcare System, Inland Valley Campus  
Property Subject to or Available for Operating Lease [Line Items]  
Renewal options at existing lease rates expiration year 2021
Renewal options at fair market value lease rates expiration year 2031
Minimum | Wellington Regional Medical Center  
Property Subject to or Available for Operating Lease [Line Items]  
Renewal options at fair market value lease rates expiration year 2022
Minimum | Southwest Healthcare System, Inland Valley Campus  
Property Subject to or Available for Operating Lease [Line Items]  
Renewal options at fair market value lease rates expiration year 2022