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Dividends Declared Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Schedule of Dividends Declared | The Company typically declares quarterly dividends twice in the first quarter, once in the second quarter and once in the third quarter.
Declaration Date |  | Date Paid (Payable) |  |  | Shareholder of Record Date |  |  | Dividend Amount |
03/28/13 |  |  | 05/15/13 |  |  |  | 05/01/13 |  |  | $ | 0.345 |
01/17/13 |  |  | 02/15/13 |  |  |  | 02/01/13 |  |  | $ | 0.345 |
09/19/12 |  |  | 11/15/12 |  |  |  | 11/01/12 |  |  | $ | 0.345 |
06/6/12 |  |  | 08/15/12 |  |  |  | 08/01/12 |  |  | $ | 0.345 |
03/22/12 |  |  | 05/15/12 |  |  |  | 05/01/12 |  |  | $ | 0.345 |
01/17/12 |  |  | 02/15/12 |  |  |  | 02/01/12 |  |  | $ | 0.345 |

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- Definition Dividends Declared + References No definition available. + Details
Name: | utl_DividendsDeclaredTableTextBlock
Namespace Prefix: | utl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration