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Aggregate Net Purchase Price Allocation to Assets and Liabilities based on Estimated Fair Values (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |
Goodwill | $ 3,036,765 us-gaap_Goodwill | $ 3,291,213 us-gaap_Goodwill | $ 3,049,016 us-gaap_Goodwill
2012 Acquisitions of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Working capital, net | 21,000 uhs_WorkingCapitalNet / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |
Property & equipment | 60,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |
Goodwill | 446,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |
Other assets | 9,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |
Income tax assets, net of deferred tax liabilities | (1,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |
Other | (7,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |
Cash paid in 2012 for acquisitions | 528,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandTwelveAcquisitionsOfAssetsAndBusinessesMember |  |
2014 Acquisitions of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Working capital, net |  | (41,000)uhs_WorkingCapitalNet / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |
Property & equipment |  | 174,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |
Goodwill |  | 250,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |
Other assets |  | 59,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |
Income tax assets, net of deferred tax liabilities |  | 4,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |
Debt |  | (16,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |
Other |  | 1,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |
Cash paid in 2012 for acquisitions |  | $ 431,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = uhs_TwoThousandFourteenAcquisitionsMember |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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