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Computation of Basic and Diluted Earnings per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic and diluted: |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | $ 604,996 us-gaap_IncomeLossFromContinuingOperations | $ 554,023 us-gaap_IncomeLossFromContinuingOperations | $ 489,047 us-gaap_IncomeLossFromContinuingOperations
Less: Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (59,653)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (43,290)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (45,601)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
Less: Net income attributable to unvested restricted share grants |  |  |  |  |  |  |  |  | (236)uhs_NetIncomeAllocatedToUnvestedRestrictedShares | (294)uhs_NetIncomeAllocatedToUnvestedRestrictedShares | (497)uhs_NetIncomeAllocatedToUnvestedRestrictedShares
Net income attributable to UHS-basic and diluted |  |  |  |  |  |  |  |  | $ 545,107 uhs_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted | $ 510,439 uhs_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted | $ 442,949 uhs_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted
Weighted average number of common shares-basic |  |  |  |  |  |  |  |  | 98,826 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 98,033 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 96,821 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Total basic earnings per share | $ 1.75 us-gaap_EarningsPerShareBasic | $ 0.84 us-gaap_EarningsPerShareBasic | $ 1.53 us-gaap_EarningsPerShareBasic | $ 1.40 us-gaap_EarningsPerShareBasic | $ 1.27 us-gaap_EarningsPerShareBasic | $ 1.17 us-gaap_EarningsPerShareBasic | $ 1.55 us-gaap_EarningsPerShareBasic | $ 1.23 us-gaap_EarningsPerShareBasic | $ 5.52 us-gaap_EarningsPerShareBasic | $ 5.21 us-gaap_EarningsPerShareBasic | $ 4.57 us-gaap_EarningsPerShareBasic
Weighted average number of common shares |  |  |  |  |  |  |  |  | 98,826 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 98,033 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 96,821 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net effect of dilutive stock options and grants based on the treasury stock method |  |  |  |  |  |  |  |  | 1,718 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 1,328 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 890 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average number of common shares and equivalents-diluted |  |  |  |  |  |  |  |  | 100,544 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 99,361 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 97,711 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Total diluted earnings per share | $ 1.71 us-gaap_EarningsPerShareDiluted | $ 0.82 us-gaap_EarningsPerShareDiluted | $ 1.51 us-gaap_EarningsPerShareDiluted | $ 1.38 us-gaap_EarningsPerShareDiluted | $ 1.24 us-gaap_EarningsPerShareDiluted | $ 1.15 us-gaap_EarningsPerShareDiluted | $ 1.53 us-gaap_EarningsPerShareDiluted | $ 1.21 us-gaap_EarningsPerShareDiluted | $ 5.42 us-gaap_EarningsPerShareDiluted | $ 5.14 us-gaap_EarningsPerShareDiluted | $ 4.53 us-gaap_EarningsPerShareDiluted

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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