SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) - EBP 002 [Member]
|
12 Months Ended |
|
Dec. 31, 2025
USD ($)
|
|---|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| Entity Tax Identification Number |
02-0381573
|
|
| EBP, Plan Number |
002
|
|
| EBP, Plan Name |
Unitil Corporation Tax Deferred Savings and Investment Plan
|
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
[1] |
| Employee Benefit Plan, Current Value |
$ 2,354,207
|
|
| Employee Benefit Plan, Current Value |
$ 165,547,500
|
|
| Maximum [Member] |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| Employee Benefit Plan, Percentage of Participant Loans |
9.50%
|
|
| Minimum [Member] |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| Employee Benefit Plan, Percentage of Participant Loans |
4.25%
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2020 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2020 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 2,377,950
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2025 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2025 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 4,165,647
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2030 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2030 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 8,053,191
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2035 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2035 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 4,130,552
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2040 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2040 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 5,811,710
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2045 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2045 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 5,914,450
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2050 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2050 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 4,519,806
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2055 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2055 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 7,554,615
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2060 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2060 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 1,251,974
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Amer Target 2065 Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Amer Target 2065 Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 925,276
|
|
| Investment, Identifier [Axis]: Investments at Fair Value American Balanced Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
American Balanced Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 20,093,099
|
|
| Investment, Identifier [Axis]: Investments at Fair Value American EUPAC R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
American EUPAC R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 3,614,657
|
|
| Investment, Identifier [Axis]: Investments at Fair Value American New World Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
American New World Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 1,489,854
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Cohen & Steers Inst Realty Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Cohen & Steers Inst Realty [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 985,013
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Dodge & Cox Income Fund Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Dodge & Cox Income Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 3,914,346
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Fid Advisor Mid Cap II Fund Z Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fid Advisor Mid Cap II Fund Z [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 2,478,731
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Goldman Intl SC Insights R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Goldman Intl SC Insights R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 1,172,814
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Invesco Growth & Income R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Invesco Growth & Income R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 5,229,768
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Invesco Value Opportunities R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Invesco Value Opportunities R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 3,959,150
|
|
| Investment, Identifier [Axis]: Investments at Fair Value JP Morgan Large Growth R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan Large Growth R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 20,104,237
|
|
| Investment, Identifier [Axis]: Investments at Fair Value JP Morgan US Govt MMkt Fund Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan US Govt MMkt Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 40,849
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Janus Henderson Enterprise (N) Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Janus Henderson Enterprise (N) [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 57,817
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Loomis Sayles Core Plus Bond N Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Loomis Sayles Core Plus Bond N [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 1,905,982
|
|
| Investment, Identifier [Axis]: Investments at Fair Value MFS Intntl Intrinsic Value R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
MFS Intntl Intrinsic Value R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 2,077,903
|
|
| Investment, Identifier [Axis]: Investments at Fair Value New York Life Stable Value Fund Type of Investment Pooled Separate Account |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanPooledSeparateAccountMember
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
New York Life Stable Value Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 9,815,758
|
|
| Investment, Identifier [Axis]: Investments at Fair Value PGIM Jennison Small Company R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
PGIM Jennison Small Company R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 3,016,146
|
|
| Investment, Identifier [Axis]: Investments at Fair Value PIMCO Income Fund Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
PIMCO Income Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 212,452
|
|
| Investment, Identifier [Axis]: Investments at Fair Value PIMCO Money Market Fund Admin Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
PIMCO Money Market Fund Admin [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 402,902
|
|
| Investment, Identifier [Axis]: Investments at Fair Value PIMCO Real Return Fund Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
PIMCO Real Return Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 1,781,723
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Principal High Yield Fund R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Principal High Yield Fund R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 2,896,715
|
|
| Investment, Identifier [Axis]: Investments at Fair Value The Investment Co of Amer R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
The Investment Co of Amer R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 4,955,633
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Total |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| Employee Benefit Plan, Current Value |
$ 177,717,465
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Undiscovered Mgrs Behav Val R6 Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Undiscovered Mgrs Behav Val R6 [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 2,149,968
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Unitil Corp Common Stock Type of Investment Common Stock |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
EBP, Employer, Common Stock [Member]
|
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
[1] |
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Unitil Corp Common Stock [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 11,150,064
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Vanguard Instit Index Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Instit Index [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 23,115,772
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Vanguard Mid Cap Index Adm Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Mid Cap Index Adm [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 567,380
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Vanguard Sm Cap Index Fd Adm Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Sm Cap Index Fd Adm [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 512,681
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Vanguard Total Bd Mkt Ind Adm Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Total Bd Mkt Ind Adm [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 1,246,173
|
|
| Investment, Identifier [Axis]: Investments at Fair Value Vanguard Total Int Idx Adm Type of Investment Registered Investment Company |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Total Int Idx Adm [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| Employee Benefit Plan, Current Value |
$ 1,710,500
|
|
| Investment, Identifier [Axis]: Total Investments on Financial Statements |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| Employee Benefit Plan, Current Value |
$ 175,363,258
|
|
|
|