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Lease Accounting - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2023 Hospital
Lessee Lease Description [Line Items] |
Lessee, operating lease, existence of option to extend [true false] | true
Number of hospital facilities | 5
Two Hospital Facilities |
Lessee Lease Description [Line Items] |
Lease expiration term | 2026
Another Two Hospital Facilities |
Lessee Lease Description [Line Items] |
Lease expiration term | 2033
One Hospital Facility |
Lessee Lease Description [Line Items] |
Lease expiration term | 2040
Minimum |
Lessee Lease Description [Line Items] |
Initial term of real estate lease | 5 years
Real estate leases option to extend lease term | 5 years
Maximum |
Lessee Lease Description [Line Items] |
Initial term of real estate lease | 10 years
Real estate leases option to extend lease term | 10 years

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- Definition Lease expiration term. + References No definition available. + Details
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Namespace Prefix: | uhs_
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Balance Type: | na
Period Type: | duration

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- Definition Number of hospital facilities. + References No definition available. + Details
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Namespace Prefix: | uhs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Term of lessee's operating lease, 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
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- Details
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- Details
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- Details
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