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Long Term Debt, Credit Arrangements and Guarantees - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  | 9 Months Ended |  |  |  |
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Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Sep. 30, 2012 Northern Utilities Inc | Dec. 31, 2011 Northern Utilities Inc | Sep. 30, 2011 Northern Utilities Inc | Sep. 30, 2012 Revolving Facility | Dec. 31, 2011 Revolving Facility | Sep. 30, 2011 Revolving Facility | Jul. 24, 2012 Revolving Facility Scenario, Forecast | Sep. 30, 2012 Senior Secured Notes Eight Point Zero Zero Percent Due Through August One Twenty Seventeen Unitil Realty Corp | Sep. 30, 2012 Senior Notes Seven Point One Five Percent Due December Fifteen Twenty Eighteen Granite State Gas Transmission Inc
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility expiration date |  |  |  |  |  |  | Oct. 08, 2013 |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  | $ 60.0 | $ 115.0 | $ 80.0 | $ 115.0 |  |
Reduced Borrowing Limit |  |  |  |  |  |  |  |  |  | 60 |  |
Percentage of capitalization |  |  |  |  |  |  | The revolving credit agreement also contains a covenant restricting the Company's ability to permit funded debt to exceed 65% of capitalization at the end of each fiscal quarter. As of September 30,2012, September 30, 2011 and December 31, 2011, the Company was in compliance with the financial covenants contained in the revolving credit agreement. |  |  |  |  |
Outstanding Inventory |  |  |  | 10.6 | 14.9 | 13.0 |  |  |  |  |  |
Accounts Payable | 17.1 | 26.4 | 16.0 | 0 | 2.5 | 0 |  |  |  |  |  |
Guarantee outstanding | 20.6 |  |  |  |  |  |  |  |  |  |  |
Guarantee end date | Feb. 28, 2014 |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes outstanding |  |  |  |  |  |  |  |  |  |  | $ 3.0 | $ 10.0

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- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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