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Common Stock - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Dividends declared and paid, per share | $ 0.30 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.60 us-gaap_CommonStockDividendsPerShareCashPaid |
Dividends declared and paid | $ 29,700,000 us-gaap_DividendsCommonStockCash | $ 19,600,000 us-gaap_DividendsCommonStockCash | $ 58,400,000 us-gaap_DividendsCommonStockCash |
Stock repurchase programs authorized to purchase, value | 400,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  | 400,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock repurchased, value | 100,749,000 us-gaap_StockRepurchasedDuringPeriodValue | 27,201,000 us-gaap_StockRepurchasedDuringPeriodValue | 19,154,000 us-gaap_StockRepurchasedDuringPeriodValue |
Compensation cost recognized | 31,092,000 us-gaap_ShareBasedCompensation | 27,783,000 us-gaap_ShareBasedCompensation | 22,518,000 us-gaap_ShareBasedCompensation |
Excess tax benefit from share based compensation | 33,912,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 20,121,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 16,040,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |
Stock options granted during period (net of cancellations) | 2,845,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 2,889,750 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 2,966,850 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |
Total in-the-money value of all stock options exercised during the year | 112,500,000 uhs_InMoneyValueOfStockOptions | 70,900,000 uhs_InMoneyValueOfStockOptions | 54,400,000 uhs_InMoneyValueOfStockOptions |
Stock issued during period, net of cancellations | 1,100,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation |  |  |
Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted during period (net of cancellations) | 2.8 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = uhs_StockIncentivePlanMember | 2.6 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = uhs_StockIncentivePlanMember | 2.6 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = uhs_StockIncentivePlanMember |
Weighted-average grant date fair value of option granted | $ 17.23 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = uhs_StockIncentivePlanMember | $ 13.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = uhs_StockIncentivePlanMember | $ 10.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = uhs_StockIncentivePlanMember |
Common Stock remain available for issuance | 3,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = uhs_StockIncentivePlanMember |  |  |
2005 Employees' Restricted Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost recognized | 75,303 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = uhs_EmployeeStockPurchasePlanTwentyZeroFiveMember | 90,587 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = uhs_EmployeeStockPurchasePlanTwentyZeroFiveMember | 117,901 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = uhs_EmployeeStockPurchasePlanTwentyZeroFiveMember |
Common Stock remain available for issuance | 4,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = uhs_EmployeeStockPurchasePlanTwentyZeroFiveMember |  |  |
Stock issued under employee stock purchase plan | 26,189 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_PlanNameAxis = uhs_EmployeeStockPurchasePlanTwentyZeroFiveMember | 10,000 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_PlanNameAxis = uhs_EmployeeStockPurchasePlanTwentyZeroFiveMember | 54,127 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_PlanNameAxis = uhs_EmployeeStockPurchasePlanTwentyZeroFiveMember |
Percentage of discount provided to eligible employees for purchase of shares under employee stock purchase plan | 10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate / us-gaap_PlanNameAxis = uhs_EmployeeStockPurchasePlanTwentyZeroFiveMember |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost recognized, pre-tax charge | 29,200,000 uhs_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostBeforeTax / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 25,800,000 uhs_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostBeforeTax / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 20,100,000 uhs_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostBeforeTax / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost recognized, after-tax | 1,900,000 uhs_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostNetOfTax / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 2,000,000 uhs_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostNetOfTax / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 2,400,000 uhs_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostNetOfTax / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Stock Repurchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchased, shares | 548,192 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = uhs_StockRepurchaseProgramMember |  |  |
Stock repurchased, value | 57,950,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = uhs_StockRepurchaseProgramMember |  |  |
Income Tax Withholding Obligations |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchased, shares | 480,972 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = uhs_IncomeTaxWithheldMember |  |  |
Stock repurchased, value | 42,700,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = uhs_IncomeTaxWithheldMember |  |  |
Special Cash Dividend |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Dividends declared and paid, per share |  |  | $ 0.40 us-gaap_CommonStockDividendsPerShareCashPaid / uhs_DividendsPaidAxis = uhs_SpecialDividendMember |
Dividends declared and paid |  |  | $ 38,900,000 us-gaap_DividendsCommonStockCash / uhs_DividendsPaidAxis = uhs_SpecialDividendMember |
Class B |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved | 6,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |
Issuance upon conversion of shares | 23,297,420 uhs_ShareBasedCompensationReservedForIssuanceUponConversionOfShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |
Class B | Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved | 23,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = uhs_StockIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |

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- Definition Share based compensation arrangement by share based payment award compensation cost before tax + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award compensation cost net of tax. + References No definition available. + Details
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- Definition Share Based Compensation Reserved For Issuance Upon Conversion Of Shares + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + 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 S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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 S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: 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 Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: 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 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 Amount of stock repurchase plan authorized. + References No definition available. + Details
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