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Common Stock And Preferred Stock (Tables) | 9 Months Ended
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Sep. 30, 2012
Details on Preferred Stock | Details on preferred stock at September 30, 2012, September 30, 2011 and December 31, 2011 are shown below:
|  | September 30, |  |  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2011 |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Unitil Energy Preferred Stock, Non-Redeemable, Non-Cumulative: |  |  |  |  |  |  |  |  |  |  |  |
6.00% Series, $100 Par Value, |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Fitchburg Preferred Stock, Redeemable, Cumulative: |  |  |  |  |  |  |  |  |  |  |  |
5.125% Series, $100 Par Value |  |  | 0.8 |  |  |  | 0.8 |  |  |  | 0.8 |
8.00% Series, $100 Par Value |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 1.0 |
Total Preferred Stock |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 2.0 |
Shares Outstanding |  | September 30, |  |  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2011 |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Unitil Energy Preferred Stock, Non-Redeemable, Non-Cumulative: |  |  |  |  |  |  |  |  |  |  |  |
6.00% Series, $100 Par Value, |  |  | 2,250 |  |  |  | 2,250 |  |  |  | 2,250 |
Fitchburg Preferred Stock, Redeemable, Cumulative: |  |  |  |  |  |  |  |  |  |  |  |
5.125% Series, $100 Par Value |  |  | 7,823 |  |  |  | 7,861 |  |  |  | 7,861 |
8.00% Series, $100 Par Value |  |  | 9,654 |  |  |  | 9,696 |  |  |  | 9,696 |

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- Definition Preferred Stock Shares + References No definition available. + Details
Name: | utl_PreferredStockSharesTableTextBlock
Namespace Prefix: | utl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration