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Uncompensated Care (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Health Care Trust Fund [Line Items]      
Uncompensated care $ 1,136,022uhs_UncompensatedCare $ 998,770uhs_UncompensatedCare $ 1,045,572uhs_UncompensatedCare
Uncompensated care, percentage 100.00%uhs_PercentageOfUncompensatedCare 100.00%uhs_PercentageOfUncompensatedCare 100.00%uhs_PercentageOfUncompensatedCare
Charity Care      
Health Care Trust Fund [Line Items]      
Uncompensated care 515,435uhs_UncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_CharityCareMember		 593,474uhs_UncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_CharityCareMember		 778,268uhs_UncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_CharityCareMember
Uncompensated care, percentage 45.00%uhs_PercentageOfUncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_CharityCareMember		 59.00%uhs_PercentageOfUncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_CharityCareMember		 74.00%uhs_PercentageOfUncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_CharityCareMember
Uninsured Discounts      
Health Care Trust Fund [Line Items]      
Uncompensated care $ 620,587uhs_UncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_UninsuredDiscountsMember		 $ 405,296uhs_UncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_UninsuredDiscountsMember		 $ 267,304uhs_UncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_UninsuredDiscountsMember
Uncompensated care, percentage 55.00%uhs_PercentageOfUncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_UninsuredDiscountsMember		 41.00%uhs_PercentageOfUncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_UninsuredDiscountsMember		 26.00%uhs_PercentageOfUncompensatedCare
/ uhs_HealthCarePlanAxis
= uhs_UninsuredDiscountsMember