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Long Term Debt, Credit Arrangements and Guarantees - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
Line of Credit Facility [Line Items] |  |  |
Accounts Payable | $ 21.7 | $ 32.7 | $ 17.4
Guarantee outstanding | 13.5 |  |
Guarantee end date | Feb. 28, 2014 |  |
Northern Utilities Inc |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding inventory | 7.2 | 10.7 | 8.0
Accounts Payable | 0.1 | 2.1 | 0
Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facility expiration date | Oct. 08, 2013 |  |
Revolving credit facility | 60.0 | 60.0 | 115.0
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 June 30, 2013, June 30, 2012 and December 31, 2012, the Company was in compliance with the financial covenants contained in the revolving credit agreement. |  |
Senior Secured Notes Eight Point Zero Zero Percent Due Through August One Twenty Seventeen | Unitil Realty Corp |  |  |
Line of Credit Facility [Line Items] |  |  |
Senior Secured Notes | 2.6 | 2.8 | 3.1
Senior Secured Notes Eight Point Zero Zero Percent Due Through August One Twenty Seventeen | Debt Outstanding, Principal Amount | Unitil Realty Corp |  |  |
Line of Credit Facility [Line Items] |  |  |
Senior Secured Notes | 2.6 |  |
Senior Notes Seven Point One Five Percent Due December Fifteen Twenty Eighteen | Granite State Gas Transmission Inc |  |  |
Line of Credit Facility [Line Items] |  |  |
Senior Notes | 10.0 | 10.0 | 10.0
Senior Notes Seven Point One Five Percent Due December Fifteen Twenty Eighteen | Debt Outstanding, Principal Amount | Granite State Gas Transmission Inc |  |  |
Line of Credit Facility [Line Items] |  |  |
Senior Notes | $ 10.0 |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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