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Quarterly Results - Additional Information (Detail) (USD $) | 3 Months Ended
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Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013
Implementation of EHR applications |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction | $ 7,900,000 uhs_UnfavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | $ 7,100,000 uhs_UnfavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | $ 8,900,000 uhs_UnfavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | $ 8,900,000 uhs_UnfavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | $ 1,100,000 uhs_UnfavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember |  |  |
Unfavorable after-tax reduction | 4,500,000 uhs_UnfavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | 3,900,000 uhs_UnfavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | 4,900,000 uhs_UnfavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | 4,900,000 uhs_UnfavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | 327,000 uhs_UnfavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember |  |  |
Tax reduction per diluted share | $ 0.04 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | $ 0.04 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | $ 0.05 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | $ 0.05 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember | $ 0.01 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioThreeMember |  |  |
EHR applications |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Tax reduction per diluted share |  |  |  |  |  | $ 0.08 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioSixMember | $ 0.12 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioSixMember | $ 0.05 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioSixMember
Favorable pre-tax reduction |  |  |  |  |  | 13,800,000 uhs_FavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioSixMember | 19,400,000 uhs_FavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioSixMember | 8,400,000 uhs_FavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioSixMember
Favorable after-tax reduction |  |  |  |  |  | 8,600,000 uhs_FavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioSixMember | 11,800,000 uhs_FavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioSixMember | 5,100,000 uhs_FavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioSixMember
Resulting from the gain realized on the sale of a non-operating investment |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Tax reduction per diluted share |  |  | $ 0.07 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioTenMember |  |  |  |  |
Favorable pre-tax reduction |  |  | 10,100,000 uhs_FavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioTenMember |  |  |  |  |
Favorable after-tax reduction |  |  | 6,300,000 uhs_FavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioTenMember |  |  |  |  |
Related to extinguishment of debt from the early redemption of previously outstanding $250 million 7.00% senior unsecured notes and the repayment of $550 million of previously outstanding Term Loan B facility |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction | 36,200,000 uhs_UnfavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioElevenMember |  |  |  |  |  |  |
Unfavorable after-tax reduction | 22,700,000 uhs_UnfavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioElevenMember |  |  |  |  |  |  |
Tax reduction per diluted share | $ 0.23 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioElevenMember |  |  |  |  |  |  |
Incurred in connection with the previously disclosed $65 million settlement of the Garden City matter |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction | 44,000,000 uhs_UnfavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioTwelveMember |  |  |  |  |  |  |
Unfavorable after-tax reduction | 27,600,000 uhs_UnfavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioTwelveMember |  |  |  |  |  |  |
Tax reduction per diluted share | $ 0.27 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioTwelveMember |  |  |  |  |  |  |
Professional and general liability self-insurance reserves |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Tax reduction per diluted share |  |  |  | $ 0.38 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioNineMember |  | $ 0.12 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioNineMember | $ 0.09 uhs_TaxReductionPerDilutedShare / us-gaap_StatementScenarioAxis = uhs_ScenarioNineMember |
Favorable pre-tax reduction |  |  |  | 65,000,000 uhs_FavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioNineMember |  | 19,700,000 uhs_FavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioNineMember | 15,600,000 uhs_FavorablePreTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioNineMember |
Favorable after-tax reduction |  |  |  | $ 37,800,000 uhs_FavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioNineMember |  | $ 11,700,000 uhs_FavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioNineMember | $ 9,200,000 uhs_FavorableAfterTaxReduction / us-gaap_StatementScenarioAxis = uhs_ScenarioNineMember |

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