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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Favorable discrete tax items | $ 1,000,000 uhs_IncomeTaxReconciliationNondeductibleExpenseFavorableDiscreteTaxItems | $ 1,000,000 uhs_IncomeTaxReconciliationNondeductibleExpenseFavorableDiscreteTaxItems | $ 1,000,000 uhs_IncomeTaxReconciliationNondeductibleExpenseFavorableDiscreteTaxItems
Foreign pre-tax earnings | 15,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 6,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 38,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Effective income tax rate, foreign | 21.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential |  |
Undistributed foreign earnings | 10,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Unrecognizable deferred tax liability related to foreign earnings | 4,000,000 us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries |  |
Deferred federal and state tax benefit | 17,000,000 uhs_DeferredFederalAndStateIncomeTaxExpenseBenefit | 5,000,000 uhs_DeferredFederalAndStateIncomeTaxExpenseBenefit |
Future taxable income, amount | 1,110,000,000 uhs_IncomeTaxExpenseBenefitFutureTaxableIncome |  |
Deferred state tax benefit (net of the federal benefit) | 7,525,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 3,278,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (6,157,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Net operating losses | 60,521,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 57,204,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Deferred foreign tax benefit | 3,000,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit |  |
Valuation allowances | 52,764,000 us-gaap_DeferredTaxAssetsValuationAllowance | 46,841,000 us-gaap_DeferredTaxAssetsValuationAllowance |
Increase in estimated liabilities for uncertain tax positions | 1,000,000 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease | 1,000,000 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |
Decrease in estimated liabilities for uncertain tax positions due to the lapse of the statute of limitations | 1,000,000 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |  |
Impact of unrecognized tax benefits if recognized | 2,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 2,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Jurisdictions statutes of limitations expiration period | 12 months |  |
Period of expiration of the statute of limitations for certain jurisdictions | Within the next twelve months |  |
Allowance in relation to state tax benefit |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances | 50,000,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = uhs_ValuationAllowanceMember | 44,000,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = uhs_ValuationAllowanceMember |
Net Operating Losses |  |  |
Income Taxes [Line Items] |  |  |
Increase in valuation allowance | 6,000,000 us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = uhs_NetOperatingLossesMember |  |
Foreign Net Operating Losses |  |  |
Income Taxes [Line Items] |  |  |
Increase in valuation allowance | 3,000,000 us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = uhs_ForeignNetOperatingLossesMember | 3,000,000 us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = uhs_ForeignNetOperatingLossesMember |
Maximum |  |  |
Income Taxes [Line Items] |  |  |
Accrued interest and penalties | 1,000,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued / us-gaap_RangeAxis = us-gaap_MaximumMember | 1,000,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued / us-gaap_RangeAxis = us-gaap_MaximumMember |
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years | 4 years |  |
Minimum |  |  |
Income Taxes [Line Items] |  |  |
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years | 3 years |  |
State and Local Jurisdiction |  |  |
Income Taxes [Line Items] |  |  |
Deferred state tax benefit (net of the federal benefit) | 54,000,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Foreign Tax Authority |  |  |
Income Taxes [Line Items] |  |  |
Net operating losses | $ 7,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |

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