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Schedule of Information Related to Stock Repurchase Programs (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 31, 2014 | Dec. 31, 2011
Class of Stock [Line Items] |  |  |  |  |
Additional dollars authorized for repurchase | $ 400,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  | $ 400,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |
Total number of shares purchased | 1,889,646 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward |  |  |  |
Total number of shares cancelled | 767,704 uhs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsCancelledInPeriod |  |  |  |
Aggregate purchase price paid | 147,104 uhs_AggregatePurchasePricePaid |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program | 100,749 us-gaap_StockRepurchasedDuringPeriodValue | 27,201 us-gaap_StockRepurchasedDuringPeriodValue | 19,154 us-gaap_StockRepurchasedDuringPeriodValue |  |
Stock Repurchase Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total number of shares purchased as part of publicly announced programs | 548,192 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = uhs_StockRepurchaseProgramMember |  |  |  |
Average price pad per share for shares purchased as part of publicly announced program | $ 105.71 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = uhs_StockRepurchaseProgramMember |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program | 57,950 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = uhs_StockRepurchaseProgramMember |  |  |  |
Stock Repurchase Programs Twenty Eleven |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Maximum number of shares that may yet be purchased under the program |  |  |  |  | 767,704 uhs_MaximumNumberOfSharesThatMayYetBePurchasedUnderProgram / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwoThousandElevenMember
Stock Repurchase Programs Twenty Twelve |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total number of shares purchased |  |  | 433,312 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyTwelveMember |  |
Aggregate purchase price paid |  |  | 19,154 uhs_AggregatePurchasePricePaid / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyTwelveMember |  |
Maximum number of shares that may yet be purchased under the program |  |  | 767,704 uhs_MaximumNumberOfSharesThatMayYetBePurchasedUnderProgram / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyTwelveMember |  |
Stock Repurchase Programs Twenty Thirteen |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total number of shares purchased |  | 427,170 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyThirteenMember |  |  |
Aggregate purchase price paid |  | 27,201 uhs_AggregatePurchasePricePaid / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyThirteenMember |  |  |
Maximum number of shares that may yet be purchased under the program |  | 767,704 uhs_MaximumNumberOfSharesThatMayYetBePurchasedUnderProgram / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyThirteenMember |  |  |
Stock Repurchase Programs Twenty Fourteen |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Additional dollars authorized for repurchase | 400,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyFourteenMember |  |  |  |
Total number of shares purchased | 1,029,164 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyFourteenMember |  |  |  |
Total number of shares cancelled | 767,704 uhs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsCancelledInPeriod / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyFourteenMember |  |  |  |
Aggregate purchase price paid | 100,749 uhs_AggregatePurchasePricePaid / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyFourteenMember |  |  |  |
Maximum number of dollars that may yet be purchased under the program | 342,050 uhs_MaximumNumberOfSharesThatMayYetBePurchasedUnderProgramValue / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyFourteenMember |  |  |  |
Stock Repurchase Programs Twenty Fourteen | Stock Repurchase Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total number of shares purchased as part of publicly announced programs | 548,192 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyFourteenMember / us-gaap_ShareRepurchaseProgramAxis = uhs_StockRepurchaseProgramMember |  |  |  |
Average price pad per share for shares purchased as part of publicly announced program | $ 105.71 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyFourteenMember / us-gaap_ShareRepurchaseProgramAxis = uhs_StockRepurchaseProgramMember |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program | $ 57,950 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_PlanNameAxis = uhs_StockRepurchaseProgramsTwentyFourteenMember / us-gaap_ShareRepurchaseProgramAxis = uhs_StockRepurchaseProgramMember |  |  |  |

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- Definition Maximum number of shares that may yet be purchased under the program + References No definition available. + Details
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- Definition The number of shares purchased on the open market during the period for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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