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Components of Gas Inventory (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Public Utilities, Inventory [Line Items] |  |
Weighted average cost inventory amount | $ 1.1 us-gaap_WeightedAverageCostInventoryAmount | $ 1.2 us-gaap_WeightedAverageCostInventoryAmount
Liquefied Natural Gas & Other |  |
Public Utilities, Inventory [Line Items] |  |
Weighted average cost inventory amount | 0.1 us-gaap_WeightedAverageCostInventoryAmount / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember | 0.1 us-gaap_WeightedAverageCostInventoryAmount / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember
Natural Gas |  |
Public Utilities, Inventory [Line Items] |  |
Weighted average cost inventory amount | 0.8 us-gaap_WeightedAverageCostInventoryAmount / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryNaturalGasMember | 0.8 us-gaap_WeightedAverageCostInventoryAmount / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryNaturalGasMember
Propane |  |
Public Utilities, Inventory [Line Items] |  |
Weighted average cost inventory amount | $ 0.2 us-gaap_WeightedAverageCostInventoryAmount / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryPropaneMember | $ 0.3 us-gaap_WeightedAverageCostInventoryAmount / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryPropaneMember

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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 + Details
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