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 | 25,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodOneMember
Aggregate Market Value | $ 700,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodOneMember
Period 2 |
Class of Stock [Line Items] |
Issuance Date | Feb. 04, 2013
Shares | 21,240 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodTwoMember
Aggregate Market Value | $ 600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodTwoMember
Period 3 |
Class of Stock [Line Items] |
Issuance Date | Jan. 31, 2014
Shares | 35,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / utl_CommonEquityOfferingProgramAxis = utl_RestrictedSharesMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = utl_PeriodThreeMember
Aggregate Market Value | $ 1,100,000 us-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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue
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