IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES - Schedule of Estimated Annual Amortization Expense (Details) $ in Thousands	Sep. 30, 2026 USD ($)
Below-Market Operating Lease Amortization
2024	$ 2,981
2025	11,846
2026	11,684
2027	11,366
2028	11,066
2029	10,916
Above-Market
Above-Market Operating Lease Amortization
2024	(369)
2025	(1,292)
2026	(1,220)
2027	(1,121)
2028	(444)
2029	(181)
In-Place Leases
2024	(369)
2025	(1,292)
2026	(1,220)
2027	(1,121)
2028	(444)
2029	(181)
In-Place Lease
Above-Market Operating Lease Amortization
2024	(5,142)
2025	(17,155)
2026	(12,977)
2027	(10,937)
2028	(7,911)
2029	(6,086)
In-Place Leases
2024	(5,142)
2025	(17,155)
2026	(12,977)
2027	(10,937)
2028	(7,911)
2029	$ (6,086)

Below Market Lease, Net Of Above Market Lease, Amortization Income, Reminder of Fiscal Year

No definition available.

Name:	ue_BelowMarketLeaseNetOfAboveMarketLeaseAmortizationIncomeReminderofFiscalYear
Namespace Prefix:	ue_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Below Market Lease, Net Of Above Market Lease, Amortization Income, Year Five

+ References

No definition available.

+ Details

Name:	ue_BelowMarketLeaseNetOfAboveMarketLeaseAmortizationIncomeYearFive
Namespace Prefix:	ue_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Below Market Lease, Net Of Above Market Lease, Amortization Income, Year Four

+ References

No definition available.

+ Details

Name:	ue_BelowMarketLeaseNetOfAboveMarketLeaseAmortizationIncomeYearFour
Namespace Prefix:	ue_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Below Market Lease, Net Of Above Market Lease, Amortization Income, Year One

+ References

No definition available.

+ Details

Name:	ue_BelowMarketLeaseNetOfAboveMarketLeaseAmortizationIncomeYearOne
Namespace Prefix:	ue_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Below Market Lease, Net Of Above Market Lease, Amortization Income, Year Three

+ References

No definition available.

+ Details

Name:	ue_BelowMarketLeaseNetOfAboveMarketLeaseAmortizationIncomeYearThree
Namespace Prefix:	ue_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Below Market Lease, Net Of Above Market Lease, Amortization Income, Year Two

+ References

No definition available.

+ Details

Name:	ue_BelowMarketLeaseNetOfAboveMarketLeaseAmortizationIncomeYearTwo
Namespace Prefix:	ue_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Below Market Lease, Net of Above Market Lease, Amortization Income, Fiscal Year Maturity [Abstract]

+ References

No definition available.

+ Details

Name:	ue_BelowMarketLeaseNetofAboveMarketLeaseAmortizationIncomeFiscalYearMaturityAbstractAbstract
Namespace Prefix:	ue_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 40
-SubTopic 30
-Topic 350
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_AboveMarketLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LeasesAcquiredInPlaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: