Number of lease renewal option exercised.

No definition available.

Name:	uhs_NumberOfLeaseRenewalOptionExercised
Namespace Prefix:	uhs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating leases additional renewal options at fair market value lease rates expiration year.

+ References

No definition available.

+ Details

Name:	uhs_OperatingLeasesAdditionalRenewalOptionsAtFairMarketValueLeaseRatesExpirationYear
Namespace Prefix:	uhs_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating leases additional renewal options term at fair market value lease rates.

+ References

No definition available.

+ Details

Name:	uhs_OperatingLeasesAdditionalRenewalOptionsTermAtFairMarketValueLeaseRates
Namespace Prefix:	uhs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating leases, renewal options at existing lease rates, expiration year.

+ References

No definition available.

+ Details

Name:	uhs_OperatingLeasesRenewalOptionsAtExistingLeaseRatesExpirationYear
Namespace Prefix:	uhs_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating leases, renewal options at fair market value lease rates, expiration year.

+ References

No definition available.

+ Details

Name:	uhs_OperatingLeasesRenewalOptionsAtFairMarketValueLeaseRatesExpirationYear
Namespace Prefix:	uhs_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating leases, renewal options term at existing lease rates.

+ References

No definition available.

+ Details

Name:	uhs_OperatingLeasesRenewalOptionsTermAtExistingLeaseRates
Namespace Prefix:	uhs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating leases, renewal options term at fair market value lease rates.

+ References

No definition available.

+ Details

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Namespace Prefix:	uhs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of annual rental increase on cumulative and compound basis.

+ References

No definition available.

+ Details

Name:	uhs_PercentageOfAnnualRentalIncreaseOnCumulativeAndCompoundBasis
Namespace Prefix:	uhs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481501/840-20-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorPropertyClassAxis=uhs_McAllenMedicalCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorPropertyClassAxis=uhs_WellingtonRegionalMedicalCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorPropertyClassAxis=uhs_AikenRegionalMedicalCenterAuroraPavilionBehavioralHealthServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorPropertyClassAxis=uhs_CanyonCreekBehavioralHealthMember
Namespace Prefix:
Data Type:	na
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Period Type:

- Details

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Summary of Details of Hospitals Leased from Trust (Parenthetical) (Detail) - RenewalOption		9 Months Ended
	Jan. 01, 2024	Sep. 30, 2024
Maximum
Property Subject to or Available for Operating Lease [Line Items]
Real estate leases option to extend lease term		10 years
Minimum
Property Subject to or Available for Operating Lease [Line Items]
Real estate leases option to extend lease term		5 years
McAllen Medical Center
Property Subject to or Available for Operating Lease [Line Items]
Renewal options term at existing lease rates		5 years
McAllen Medical Center \| Maximum
Property Subject to or Available for Operating Lease [Line Items]
Renewal options at existing lease rates expiration year		2031
Wellington Regional Medical Center
Property Subject to or Available for Operating Lease [Line Items]
Renewal options term at fair market lease rates		5 years
Percentage of annual rental increase on cumulative and compound basis	2.50%
Wellington Regional Medical Center \| Maximum
Property Subject to or Available for Operating Lease [Line Items]
Renewal options at fair market value lease rates expiration year		2031
Aiken Regional Medical Center/Aurora Pavilion Behavioral Health Services
Property Subject to or Available for Operating Lease [Line Items]
Renewal options term at fair market lease rates		5 years
Aiken Regional Medical Center/Aurora Pavilion Behavioral Health Services \| Maximum
Property Subject to or Available for Operating Lease [Line Items]
Renewal options at fair market value lease rates expiration year		2068
Aiken Regional Medical Center/Aurora Pavilion Behavioral Health Services \| Minimum
Property Subject to or Available for Operating Lease [Line Items]
Renewal options at fair market value lease rates expiration year		2034
Canyon Creek Behavioral Health
Property Subject to or Available for Operating Lease [Line Items]
Renewal options term at fair market lease rates		5 years
Percentage of annual rental increase on cumulative and compound basis	2.25%
Canyon Creek Behavioral Health \| Maximum
Property Subject to or Available for Operating Lease [Line Items]
Renewal options at fair market value lease rates expiration year		2068
Canyon Creek Behavioral Health \| Minimum
Property Subject to or Available for Operating Lease [Line Items]
Renewal options at fair market value lease rates expiration year		2034
Clive Behavioral Health Hospital
Property Subject to or Available for Operating Lease [Line Items]
Renewal options term at fair market lease rates		10 years
Percentage of annual rental increase on cumulative and compound basis		2.75%
Operating leases additional renewal options term at fair market value lease rates		10 years
Number of lease renewal option exercised		3
Clive Behavioral Health Hospital \| Maximum
Property Subject to or Available for Operating Lease [Line Items]
Renewal options at fair market value lease rates expiration year		2070
Operating leases additional renewal options at fair market value lease rates expiration year		2090
Clive Behavioral Health Hospital \| Minimum
Property Subject to or Available for Operating Lease [Line Items]
Renewal options at fair market value lease rates expiration year		2041
Operating leases additional renewal options at fair market value lease rates expiration year		2071