XML 56 R42.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Restricted Stock Units Issued (Detail) - Restricted Stock Units (RSUs) | 9 Months Ended
--- | ---
Sep. 30, 2017 $ / shares shares
Restricted Stock Units |
Beginning Restricted Stock Units | shares | 43,345
Restricted Stock Units Granted | shares | 0
Dividend Equivalents Earned | shares | 998
Restricted Stock Units Settled | shares | 0
Ending Restricted Stock Units | shares | 44,343
Weighted-Average Stock Price |
Beginning Restricted Stock Units | $ / shares | $ 33.40
Restricted Stock Units Granted | $ / shares | 0
Dividend Equivalents Earned | $ / shares | 47.32
Restricted Stock Units Settled | $ / shares | 0
Ending Restricted Stock Units | $ / shares | $ 33.72

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=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Fully Vested Grants in Period, Weighted Average Grant Date Fair Value. + References No definition available. + Details
Name: | utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFullyVestedGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | utl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fully Vested Settled. + References No definition available. + Details
Name: | utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFullyVestedSettled
Namespace Prefix: | utl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Fully Vested Settled in Period, Weighted Average Grant Date Fair Value. + References No definition available. + Details
Name: | utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFullyVestedSettledInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | utl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Fully Vested, Weighted Average Grant Date Fair Value + References No definition available. + Details
Name: | utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFullyVestedWeightedAverageGrantDateFairValue
Namespace Prefix: | utl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share Based Payment Award Equity Instruments Other Than Options Dividend Equivalent Rights In Period. + References No definition available. + Details
Name: | utl_ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDividendEquivalentRightsInPeriod
Namespace Prefix: | utl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Payment Award Equity Instruments Other Than Options Fully Vested Dividend Equivalent Rights In Period Weighted Average Grant Date Fair Value. + References No definition available. + Details
Name: | utl_ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFullyVestedDividendEquivalentRightsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | utl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Fully Vested, Number + References No definition available. + Details
Name: | utl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsFullyVestedNumber
Namespace Prefix: | utl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |