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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 | $ 1,136,022 uhs_UncompensatedCare | $ 998,770 uhs_UncompensatedCare | $ 1,045,572 uhs_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 | 515,435 uhs_UncompensatedCare / uhs_HealthCarePlanAxis = uhs_CharityCareMember | 593,474 uhs_UncompensatedCare / uhs_HealthCarePlanAxis = uhs_CharityCareMember | 778,268 uhs_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 | $ 620,587 uhs_UncompensatedCare / uhs_HealthCarePlanAxis = uhs_UninsuredDiscountsMember | $ 405,296 uhs_UncompensatedCare / uhs_HealthCarePlanAxis = uhs_UninsuredDiscountsMember | $ 267,304 uhs_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

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- Definition Percentage of Uncompensated Care + References No definition available. + Details
Name: | uhs_PercentageOfUncompensatedCare
Namespace Prefix: | uhs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Uncompensated Care + References No definition available. + Details
Name: | uhs_UncompensatedCare
Namespace Prefix: | uhs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_HealthCareTrustFundLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | uhs_HealthCarePlanAxis=uhs_CharityCareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | uhs_HealthCarePlanAxis=uhs_UninsuredDiscountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |