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Summary of Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance | $ 3,049,016 us-gaap_Goodwill |  | $ 3,036,765 us-gaap_Goodwill |
Goodwill acquired during the period | 250,212 us-gaap_GoodwillAcquiredDuringPeriod | [1] |  |
Adjustments to goodwill | (8,015)us-gaap_GoodwillTranslationAdjustments |  | 12,251 us-gaap_GoodwillTranslationAdjustments | [1]
Goodwill, Ending Balance | 3,291,213 us-gaap_Goodwill |  | 3,049,016 us-gaap_Goodwill |
Acute Care Services |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance | 383,011 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareServicesMember |  | 382,696 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareServicesMember |
Goodwill acquired during the period | 4,088 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareServicesMember | [1] |  |
Adjustments to goodwill | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareServicesMember |  | 315 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareServicesMember | [1]
Goodwill, Ending Balance | 387,099 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareServicesMember |  | 383,011 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareServicesMember |
Behavioral Health Services |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance | 2,666,005 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember |  | 2,654,069 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember |
Goodwill acquired during the period | 246,124 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember | [1] |  |
Adjustments to goodwill | (8,015)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember |  | 11,936 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember | [1]
Goodwill, Ending Balance | $ 2,904,114 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember |  | $ 2,666,005 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember |
[1] | The increase in the Behavioral Health Services' goodwill consists primarily of an amount that was reclassified from other assets.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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Period Type: |