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Segment Reporting (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Gross inpatient revenues	$ 6,152,192uhs_GrossInpatientRevenues	$ 5,485,263uhs_GrossInpatientRevenues
Gross outpatient revenues	2,497,108uhs_GrossOutpatientRevenues	2,150,120uhs_GrossOutpatientRevenues
Total net revenues	2,225,353us-gaap_SalesRevenueNet	1,938,314us-gaap_SalesRevenueNet
Income/(loss) before allocation of corporate overhead and income taxes	297,017us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	235,783us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Allocation of corporate overhead	0uhs_OverheadAllocationsAdjustment	0uhs_OverheadAllocationsAdjustment
Income/(loss) after allocation of corporate overhead and before income taxes	297,017us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	235,783us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Total assets	9,084,355us-gaap_Assets	8,431,385us-gaap_Assets	8,974,443us-gaap_Assets
Acute Care Hospital Services
Segment Reporting Information [Line Items]
Gross inpatient revenues	4,328,767uhs_GrossInpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember	3,876,364uhs_GrossInpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember
Gross outpatient revenues	2,284,712uhs_GrossOutpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember	1,957,491uhs_GrossOutpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember
Total net revenues	1,145,940us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember	974,647us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember
Income/(loss) before allocation of corporate overhead and income taxes	155,200us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember	111,650us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember
Allocation of corporate overhead	(49,426)uhs_OverheadAllocationsAdjustment / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember	(44,697)uhs_OverheadAllocationsAdjustment / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember
Income/(loss) after allocation of corporate overhead and before income taxes	105,774us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember	66,953us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember
Total assets	3,431,688us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember	3,200,203us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember
Behavioral Health Services
Segment Reporting Information [Line Items]
Gross inpatient revenues	1,823,425uhs_GrossInpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember	1,608,899uhs_GrossInpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember
Gross outpatient revenues	204,569uhs_GrossOutpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember	184,115uhs_GrossOutpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember
Total net revenues	1,076,345us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember	960,347us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember
Income/(loss) before allocation of corporate overhead and income taxes	253,442us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember	221,148us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember
Allocation of corporate overhead	(29,666)uhs_OverheadAllocationsAdjustment / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember	(26,169)uhs_OverheadAllocationsAdjustment / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember
Income/(loss) after allocation of corporate overhead and before income taxes	223,776us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember	194,979us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember
Total assets	5,315,270us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember	5,004,478us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember
Other
Segment Reporting Information [Line Items]
Gross outpatient revenues	7,827uhs_GrossOutpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	8,514uhs_GrossOutpatientRevenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Total net revenues	3,068us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	3,320us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Income/(loss) before allocation of corporate overhead and income taxes	(111,625)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(97,015)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Allocation of corporate overhead	79,092uhs_OverheadAllocationsAdjustment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	70,866uhs_OverheadAllocationsAdjustment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Income/(loss) after allocation of corporate overhead and before income taxes	(32,533)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(26,149)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Total assets	$ 337,397us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ 226,704us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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