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Estimated Cost of Providing Uncompensated Care (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Health Care Trust Fund [Line Items] |  |  |
Estimated cost of providing uncompensated care | $ 172,959 uhs_EstimatedCostOfUncompensatedCare | $ 161,013 uhs_EstimatedCostOfUncompensatedCare | $ 177,189 uhs_EstimatedCostOfUncompensatedCare
Charity Care |  |  |
Health Care Trust Fund [Line Items] |  |  |
Estimated cost of providing uncompensated care | 78,475 uhs_EstimatedCostOfUncompensatedCare / uhs_HealthCarePlanAxis = uhs_CharityCareMember | 95,675 uhs_EstimatedCostOfUncompensatedCare / uhs_HealthCarePlanAxis = uhs_CharityCareMember | 131,890 uhs_EstimatedCostOfUncompensatedCare / uhs_HealthCarePlanAxis = uhs_CharityCareMember
Uninsured Discounts |  |  |
Health Care Trust Fund [Line Items] |  |  |
Estimated cost of providing uncompensated care | $ 94,484 uhs_EstimatedCostOfUncompensatedCare / uhs_HealthCarePlanAxis = uhs_UninsuredDiscountsMember | $ 65,338 uhs_EstimatedCostOfUncompensatedCare / uhs_HealthCarePlanAxis = uhs_UninsuredDiscountsMember | $ 45,299 uhs_EstimatedCostOfUncompensatedCare / uhs_HealthCarePlanAxis = uhs_UninsuredDiscountsMember

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