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Long Term Debt, Credit Arrangements and Guarantees - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  |  | 9 Months Ended |  |  | 1 Months Ended |  |  |
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Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2013 Senior Secured Notes Eight Point Zero Zero Percent Due Through August One Twenty Seventeen Unitil Realty Corp | Dec. 31, 2012 Senior Secured Notes Eight Point Zero Zero Percent Due Through August One Twenty Seventeen Unitil Realty Corp | Sep. 30, 2012 Senior Secured Notes Eight Point Zero Zero Percent Due Through August One Twenty Seventeen Unitil Realty Corp | Sep. 30, 2013 Senior Secured Notes Eight Point Zero Zero Percent Due Through August One Twenty Seventeen Debt Outstanding, Principal Amount Unitil Realty Corp | Sep. 30, 2013 Senior Notes Seven Point One Five Percent Due December Fifteen Twenty Eighteen Granite State Gas Transmission Inc | Dec. 31, 2012 Senior Notes Seven Point One Five Percent Due December Fifteen Twenty Eighteen Granite State Gas Transmission Inc | Sep. 30, 2012 Senior Notes Seven Point One Five Percent Due December Fifteen Twenty Eighteen Granite State Gas Transmission Inc | Sep. 30, 2013 Senior Notes Seven Point One Five Percent Due December Fifteen Twenty Eighteen Debt Outstanding, Principal Amount Granite State Gas Transmission Inc | Sep. 30, 2013 Revolving Credit Facility | Dec. 31, 2012 Revolving Credit Facility | Sep. 30, 2012 Revolving Credit Facility | Oct. 04, 2013 Revolving Credit Facility Subsequent Event | Oct. 04, 2013 Revolving Credit Facility Subsequent Event London Interbank Offered Rate | Sep. 30, 2013 Northern Utilities Inc | Dec. 31, 2012 Northern Utilities Inc | Sep. 30, 2012 Northern Utilities Inc
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 04, 2018 |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  | $ 60.0 | [1] | $ 60.0 | $ 60.0 | $ 120.0 |  |  |  |
Sublimit for the issuance of standby letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |
Credit facility, daily fluctuating rate of interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.375% |  |  |
Credit Facility by an aggregate additional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
Percentage of capitalization |  |  |  |  |  |  |  |  |  |  |  | The affirmative and negative covenants under the Credit Facility shall apply to Unitil until the Credit Facility terminates and all amounts borrowed under the Credit Facility are paid in full (or with respect to letters of credit, they are cash collateralized). The only financial covenant in the Credit Facility provides that Unitil’s Funded Debt to Capitalization (as each term is defined in the Credit Facility) cannot exceed 65% tested on a quarterly basis. At September 30, 2013, the Company was in compliance with the covenants contained in the Credit Facility in effect on that date. |  |  |  |  |  |  |  |
Outstanding inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.8 | 10.7 | 10.6
Accounts Payable | 21.5 | 32.7 | 19.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 2.1 | 0
Guarantee outstanding | 18.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee end date | Oct. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes |  |  |  | 2.5 | 2.8 | 3.0 | 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  | $ 10.0 | $ 10.0 | $ 10.0 | $ 10.0 |  |  |  |  |  |  |  |  |
[1] | Effective October 4, 2013, the Credit Facility borrowing limit was increased to $120 million.

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