XML 31 R50.htm IDEA: XBRL DOCUMENT v2.4.1.9

Restricted Shares Issued in Conjunction with Stock Plan (Detail) (Restricted Shares, USD $)	12 Months Ended
	Dec. 31, 2014
Period 1
Class of Stock [Line Items]
Issuance Date	Feb. 03, 2012
Shares	25,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodOneMember
Aggregate Market Value	$ 700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodOneMember
Period 2
Class of Stock [Line Items]
Issuance Date	Feb. 04, 2013
Shares	21,240us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodTwoMember
Aggregate Market Value	$ 600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodTwoMember
Period 3
Class of Stock [Line Items]
Issuance Date	Jan. 31, 2014
Shares	35,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodThreeMember
Aggregate Market Value	$ 1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodThreeMember

X

- Details

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

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

X

- Definition

Per share weighted average intrinsic value of equity-based compensation awards granted. Excludes stock and unit options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share Issued Date

+ References

No definition available.

+ Details

Name:	utl_ShareIssuedDate
Namespace Prefix:	utl_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration