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Common Stock and Preferred Stock - Additional Information (Detail) (USD $) | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  | 0 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Maximum | Sep. 30, 2013 Maximum | Sep. 30, 2014 Maximum | Sep. 30, 2013 Maximum | Sep. 30, 2014 Dividend and Distribution Reinvestment and Share Purchase Plan | Sep. 30, 2014 Dividend and Distribution Reinvestment and Share Purchase Plan Common Stock | Sep. 30, 2014 Restricted Stock | Sep. 30, 2013 Restricted Stock | Sep. 30, 2014 Restricted Stock Maximum | Sep. 30, 2013 Restricted Stock Units (RSUs) | Oct. 01, 2014 Restricted Stock Units (RSUs) Subsequent Event | Sep. 30, 2014 Unitil Energy Systems Inc Series 6 | Sep. 30, 2013 Unitil Energy Systems Inc Series 6 | Dec. 31, 2013 Unitil Energy Systems Inc Series 6
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 13,906,964 | 13,831,624 | 13,841,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, share issued | 28,958 | 29,783 |  |  |  |  |  |  | 28,958 |  |  |  |  |  |  |  |
Common stock price per share |  |  |  |  |  |  |  | $ 32.20 |  |  |  |  |  |  |  |  |
Proceed from issuance of common stock | $ 900,000 | $ 900,000 |  |  |  |  |  | $ 932,000 |  |  |  |  |  |  |  |  |
Restricted stock available for awards |  |  |  |  |  |  |  |  |  |  |  | 677,500 |  |  |  |  |
Restricted stock that may be awarded in any one calendar year to any one participant |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |
Restricted stock vesting period |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Restricted stock vesting percentage annually |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Restricted stock issue date |  |  |  |  |  |  |  |  |  | Jan. 31, 2014 |  |  |  |  |  |  |
Restricted stock issued | 35,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock grant date market value | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock non-vested |  |  |  |  |  |  |  |  |  | 67,334 | 53,480 |  |  |  |  |  |
Restricted stock weighted average grant date fair value |  |  |  |  |  |  |  |  |  | $ 28.51 | $ 25.99 |  |  |  |  |  |
Share based compensation expense | 1,300,000 | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized share based compensation |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |
Share compensation recognition period |  |  |  |  |  |  |  |  |  | 2 years 7 months 6 days |  |  |  |  |  |  |
Forfeitures or cancellations under the stock plan |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Fair value of liabilities associated with cash portion of fully vested RSUs | 200,000 | 100,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Stock Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.44 |  |  |  |
Restricted stock units outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 4,024 |  |  |  |
Fully-vested restricted stock units issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,969 |  |  |
Preferred stock, outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,250 | 2,250 | 2,250
Preferred Stock | 200,000 | 200,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 200,000 | 200,000
Dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% | 6.00%
Dividend declared |  |  |  | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000 |  |  |  |  |  |  |  |  |  |

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