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Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Earnings Available to Common Shareholders	$ 41.4	$ 36.1	$ 32.2
Weighted Average Common Shares Outstanding - Basic	15,991	15,373	14,951
Plus: Diluted Effect of Incremental Shares	5	3	1
Weighted Average Common Shares Outstanding - Diluted	15,996	15,376	14,952
Earnings per Common Share - Basic	$ 2.59	$ 2.35	$ 2.15
Earnings per Common Share - Diluted	$ 2.59	$ 2.35	$ 2.15

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1448-109256

+ Details

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

X

- Definition

Schedule Of Computation Of Basic And Diluted Earnings Per Common Share Line Items

+ References

No definition available.

+ Details

Name:	utl_ScheduleOfComputationOfBasicAndDilutedEarningsPerCommonShareLineItems
Namespace Prefix:	utl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration