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Other Noncurrent Liabilities and Redeemable/Noncontrolling Interests - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Redeemable non-controlling interest balances	$ 255us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount	$ 240us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
Non-controlling interest balances	$ 57us-gaap_MinorityInterestInJointVentures	$ 55us-gaap_MinorityInterestInJointVentures
Acute Care Hospital Services | Las Vegas, Nevada
Noncontrolling Interest [Line Items]
Percentage of noncontrolling, minority ownership interests held by outside owners	28.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember / us-gaap_StatementGeographicalAxis = uhs_LasVegasNevadaMember
Acute care facilities with outside owners holding non-controlling minority interest	5uhs_AcuteCareFacilitiesOutsideOwnersHoldingNoncontrollingMinorityInterest / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember / us-gaap_StatementGeographicalAxis = uhs_LasVegasNevadaMember
Acute Care Hospital Services | Washington, District of Columbia
Noncontrolling Interest [Line Items]
Percentage of noncontrolling, minority ownership interests held by outside owners	20.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember / us-gaap_StatementGeographicalAxis = stpr_DC
Acute Care Hospital Services | Laredo, Texas
Noncontrolling Interest [Line Items]
Percentage of noncontrolling, minority ownership interests held by outside owners	11.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_StatementBusinessSegmentsAxis = uhs_AcuteCareHospitalServicesMember / us-gaap_StatementGeographicalAxis = uhs_LaredoTexasMember
Behavioral Health Services | Philadelphia, Pennsylvania
Noncontrolling Interest [Line Items]
Percentage of noncontrolling, minority ownership interests held by outside owners	20.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_StatementBusinessSegmentsAxis = uhs_BehavioralHealthServicesMember / us-gaap_StatementGeographicalAxis = uhs_PhiladelphiaPennsylvaniaMember

X

- Definition

Acute Care Facilities Outside Owners Holding Noncontrolling Minority Interest

+ References

No definition available.

+ Details

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X

- Definition

Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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X

- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 14

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph (16)(c)

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 15

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph (12)(c)

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764

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- Details

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