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Summary of Changes in the Fair Value of the Pension Plan Level 3 Assets (Detail) (SEI Core Property Collective Investment Trust Fund, USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Actual Return on Investments:
Plan Assets at End of Year	$ 8,172,378us-gaap_DefinedBenefitPlanFairValueOfPlanAssets	[1]	$ 1,125,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets	[1]
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Beginning of Year	1,125,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = utl_SeiCorePropertyCollectiveInvestmentTrustFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Actual Return on Investments:
Related to Investments Held at Year-End	672,378us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = utl_SeiCorePropertyCollectiveInvestmentTrustFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Related to Investments Sold During the Year	0us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsSoldDuringPeriod / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = utl_SeiCorePropertyCollectiveInvestmentTrustFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member		0us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsSoldDuringPeriod / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = utl_SeiCorePropertyCollectiveInvestmentTrustFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total Return on Investments	672,378us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = utl_SeiCorePropertyCollectiveInvestmentTrustFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Purchases, Sales and Settlements	6,375,000us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = utl_SeiCorePropertyCollectiveInvestmentTrustFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member		1,125,000us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = utl_SeiCorePropertyCollectiveInvestmentTrustFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Plan Assets at End of Year	$ 8,172,378us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = utl_SeiCorePropertyCollectiveInvestmentTrustFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member		$ 1,125,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = utl_SeiCorePropertyCollectiveInvestmentTrustFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
[1] The SEI Core Property Collective Investment Trust Fund, through the SEI Core Property Fund, seeks both current income and long-term capital appreciation through investing in underlying funds that acquire, manage, and dispose of commercial real estate properties.

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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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