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Dispositions and Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended
--- | --- | ---
Dec. 31, 2012 Facility | Mar. 31, 2012 Hospital San Juan Capestrano Bed | Mar. 31, 2013 Previously Closed Facilities
Significant Acquisitions and Disposals [Line Items] |  |  |
Aggregate cash proceeds from divestiture of businesses |  | $ 53 | $ 7
Number of previously closed facilities | 2 |  |
Number of acute care hospital beds included in sale |  | 108 |

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- Definition Number of Beds + References No definition available. + Details
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Namespace Prefix: | uhs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Facilities Closed In Prior Years + References No definition available. + Details
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Namespace Prefix: | uhs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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=6943989&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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