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v2.4.1.9

Provisions for Federal and State Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | $ 10,809 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | $ 10,052 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | $ 9,085 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Total Federal Tax Provision | 10,809 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 10,052 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 9,085 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State |  |  |
Current | (387)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 386 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 132 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred | 3,573 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 2,214 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,759 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total State Tax Provision | 3,186 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 2,600 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 1,891 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Total Provision for Federal and State Income Taxes | 13,995 us-gaap_IncomeTaxExpenseBenefit | 12,652 us-gaap_IncomeTaxExpenseBenefit | 10,976 us-gaap_IncomeTaxExpenseBenefit
Operating Income |  |  |
Current Federal Tax Provision (Benefit) |  |  |
Current Benefit of Operating Loss Carrybacks | 3,179 us-gaap_CurrentFederalTaxExpenseBenefit / utl_IncomeTaxesAxis = us-gaap_OperatingIncomeLossMember |  |
Current Benefit of Operating Loss Carrybacks |  |  |
Current Federal Tax Provision (Benefit) |  |  |
Current Benefit of Operating Loss Carrybacks | (3,179)us-gaap_CurrentFederalTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_OperatingLossCarrybacksMember |  |
Utility Plant Differences |  |  |
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | 10,649 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_UtilityPlantDifferencesMember | 28,907 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_UtilityPlantDifferencesMember | 6,019 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_UtilityPlantDifferencesMember
Net Operating Loss Carryforwards |  |  |
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | 2,589 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_NetOperatingLossCarryforwardsMember | (8,053)us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_NetOperatingLossCarryforwardsMember | 2,835 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_NetOperatingLossCarryforwardsMember
Regulatory Assets and Liabilities |  |  |
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | (5,946)us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_RegulatoryAssetsAndLiabilitiesMember | (11,483)us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_RegulatoryAssetsAndLiabilitiesMember | 472 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_RegulatoryAssetsAndLiabilitiesMember
Other, net |  |  |
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | $ 3,517 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_OtherNetMember | $ 681 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_OtherNetMember | $ (241)us-gaap_DeferredFederalIncomeTaxExpenseBenefit / utl_IncomeTaxesAxis = utl_OtherNetMember

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