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General (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Organization And Description Of Business [Line Items]
Revenue from Medicaid programs	$ 2,380,101,000us-gaap_HealthCareOrganizationRevenue	$ 2,146,498,000us-gaap_HealthCareOrganizationRevenue
Increase (decrease) in net revenue		18,000,000uhs_IncreaseDecreaseOfRevenues
Increase (decrease) in other operating expense		18,000,000uhs_IncreaseDecreaseInOtherOperatingExpenses
State Medicaid programs
Organization And Description Of Business [Line Items]
Revenue from Medicaid programs	66,000,000us-gaap_HealthCareOrganizationRevenue / us-gaap_EquitySecuritiesByEntitySizeAxis = uhs_HealthcareMember	49,000,000us-gaap_HealthCareOrganizationRevenue / us-gaap_EquitySecuritiesByEntitySizeAxis = uhs_HealthcareMember
Revenue offset amount	$ 28,000,000us-gaap_EffectOnFutureEarningsOffsetAmount / us-gaap_EquitySecuritiesByEntitySizeAxis = uhs_HealthcareMember	$ 18,000,000us-gaap_EffectOnFutureEarningsOffsetAmount / us-gaap_EquitySecuritiesByEntitySizeAxis = uhs_HealthcareMember

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Increase (Decrease) in Other Operating Expenses

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- Definition

Increase Decrease Of Revenues

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- Definition

The amount that will be offset against future earnings by anticipated increases or decreases in other expenses or revenues.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4)

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- Definition

Amount of revenues recognized by the entity from providing services to in-patients, outpatients, residents in facilities owned or operated by the entity, from insurance premiums, or from goods provided or services performed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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