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Dispositions and Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015 Bed | Mar. 31, 2014
Significant Acquisitions and Disposals [Line Items] |  |
Cash paid/reserved related to acquisition of property and businesses | $ 34,500,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 3,301,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Number of beds | 24 uhs_NumberOfBedsAvailableInAcquiredHospitalInBusinessAcquisition |
Aggregate cash proceeds from divestiture of businesses |  | 11,000,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Pre-tax gain (loss) proceeds from divestiture of businesses |  | $ 10,000,000 uhs_GainLossOnSaleOfBusinessBeforeTax
Cygnet Hospital-Taunton |  |
Significant Acquisitions and Disposals [Line Items] |  |
Number of beds | 46 uhs_NumberOfBedsAvailableInAcquiredHospitalInBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = uhs_AcquiredCompanyFourMember |
Palo Verde Behavioral Health |  |
Significant Acquisitions and Disposals [Line Items] |  |
Number of beds |  | 48 uhs_NumberOfBedsAvailableInAcquiredHospitalInBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = uhs_AcquiredCompanyThreeMember

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- Definition Number Of Beds Available In Acquired Hospital In Business Acquisition + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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