XML 58 R40.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Significant Segment Financial Data (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 115,400 | $ 84,000 | $ 80,800 | $ 126,000 | $ 104,300 | $ 78,800 | $ 74,500 | $ 125,800 | $ 406,200 | $ 383,400 | $ 426,800
Interest Income |  |  |  |  |  |  |  |  | 2,400 | 1,200 | 1,900
Interest Expense |  |  |  |  |  |  |  |  | 25,500 | 23,700 | 23,800
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 46,900 | 46,600 | 45,700
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 17,537 | 15,354 | 15,443
Segment Profit | 11,200 | $ 2,300 | $ 3,100 | $ 12,400 | 10,200 | $ 3,500 | $ 2,500 | $ 10,900 | 29,000 | 27,100 | 26,300
Segment Assets | 1,241,900 |  |  |  | 1,128,200 |  |  |  | 1,241,900 | 1,128,200 | 1,038,800
Capital Expenditures |  |  |  |  |  |  |  |  | 119,300 | 98,100 | 103,900
Gas Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 194,000 | 181,200 | 202,600
Interest Income |  |  |  |  |  |  |  |  | 700 | 200 | 800
Interest Expense |  |  |  |  |  |  |  |  | 13,700 | 13,300 | 13,300
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 22,400 | 21,900 | 20,700
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 10,700 | 9,200 | 10,200
Segment Profit |  |  |  |  |  |  |  |  | 16,400 | 14,500 | 15,300
Segment Assets | 714,300 |  |  |  | 645,200 |  |  |  | 714,300 | 645,200 | 590,900
Capital Expenditures |  |  |  |  |  |  |  |  | 72,100 | 57,000 | 64,900
Electric |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 206,200 | 196,100 | 218,000
Interest Income |  |  |  |  |  |  |  |  | 1,000 | 700 | 700
Interest Expense |  |  |  |  |  |  |  |  | 8,800 | 8,300 | 8,800
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 23,400 | 23,800 | 24,000
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 7,500 | 6,600 | 5,500
Segment Profit |  |  |  |  |  |  |  |  | 11,900 | 11,100 | 8,700
Segment Assets | 476,900 |  |  |  | 441,100 |  |  |  | 476,900 | 441,100 | 415,100
Capital Expenditures |  |  |  |  |  |  |  |  | 33,700 | 30,100 | 29,900
All Other Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Income |  |  |  |  |  |  |  |  | 600 | 200 | 300
Interest Expense |  |  |  |  |  |  |  |  | 3,000 | 2,100 | 1,700
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 1,000 | 800 | 900
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (1,400) | (1,200) | (1,100)
Segment Profit |  |  |  |  |  |  |  |  | (500) | 400 | 1,000
Segment Assets | 44,000 |  |  |  | 35,100 |  |  |  | 44,000 | 35,100 | 26,200
Capital Expenditures |  |  |  |  |  |  |  |  | 13,500 | 11,000 | 9,000
Unregulated Operation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,000 | 6,100 | 6,200
Interest Income |  |  |  |  |  |  |  |  | 100 | 100 | 100
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 100 | 100 | 100
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 700 | 800 | 800
Segment Profit |  |  |  |  |  |  |  |  | 1,200 | 1,100 | 1,300
Segment Assets | $ 6,700 |  |  |  | $ 6,800 |  |  |  | $ 6,700 | $ 6,800 | 6,600
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | $ 100

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
Name: | us-gaap_InterestAndOtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
Name: | us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of operating revenues recognized during the period. + References No definition available. + Details
Name: | us-gaap_RegulatedAndUnregulatedOperatingRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating expense for depreciation and amortization of regulated operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=utl_GasSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=utl_ElectricMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis=us-gaap_UnregulatedOperationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |