Number of trading period.

No definition available.

Name:	uht_NumberOfTradingPeriod
Namespace Prefix:	uht_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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

No definition available.

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=uht_LimitedLiabilityCompanyOrLimitedPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=uht_MedicalOfficeBuildingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=uht_UnconsolidatedLimitedLiabilitiesOrLimitedPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=uht_ArlingtonMedicalPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Summarized Financial Information of Equity Affiliates - Additional Information (Detail) - Property	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Mar. 12, 2017
Limited Liability Companies \| Medical office buildings
Schedule Of Equity Method Investments [Line Items]
Number of real estate investments	4
Minimum
Schedule Of Equity Method Investments [Line Items]
Number of days for Non-Offering Member either to purchase or sell its entire ownership interest to or from Offering Member	60 days
Maximum
Schedule Of Equity Method Investments [Line Items]
Number of days for Non-Offering Member either to purchase or sell its entire ownership interest to or from Offering Member	90 days
4 Unconsolidated Limited Liability Companies / Limited Partner \| Minimum
Schedule Of Equity Method Investments [Line Items]
Non-controlling equity interest, ownership percentage	33.00%
4 Unconsolidated Limited Liability Companies / Limited Partner \| Maximum
Schedule Of Equity Method Investments [Line Items]
Non-controlling equity interest, ownership percentage	95.00%
Arlington Medical Properties
Schedule Of Equity Method Investments [Line Items]
Non-controlling equity interest, ownership percentage		85.00%
Remaining percentage owned by third party member			15.00%