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Lease Commitments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Facility | Dec. 31, 2013 | Dec. 31, 2012
Leases Disclosure [Line Items] |  |  |
Number of hospital facilities | 3 uhs_NumberOfHospitalFacilities |  |
Additional capital lease obligations incurred | $ 16,000,000 us-gaap_CapitalLeaseObligationsIncurred | $ 0 us-gaap_CapitalLeaseObligationsIncurred | $ 0 us-gaap_CapitalLeaseObligationsIncurred

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- Details
Name: | uhs_LeasesDisclosureLineItems
Namespace Prefix: | uhs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of hospital facilities + References No definition available. + Details
Name: | uhs_NumberOfHospitalFacilities
Namespace Prefix: | uhs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase during the period in capital lease obligations due to entering into new capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_CapitalLeaseObligationsIncurred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration