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Components of Gas Inventory (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | $ 0.5 | $ 1.1 | $ 0.6
Natural Gas |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount |  | 0.6 | 0.1
Propane |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | 0.3 | 0.4 | 0.4
Liquefied Natural Gas & Other |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | $ 0.2 | $ 0.1 | $ 0.1

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- Definition The amount of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 9 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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