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Components of Gas Inventory (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Public Utilities, Inventory [Line Items]
Weighted average cost inventory amount	$ 0.4us-gaap_WeightedAverageCostInventoryAmount	$ 1.1us-gaap_WeightedAverageCostInventoryAmount	$ 0.6us-gaap_WeightedAverageCostInventoryAmount
Liquefied Natural Gas & Other
Public Utilities, Inventory [Line Items]
Weighted average cost inventory amount	0.1us-gaap_WeightedAverageCostInventoryAmount / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember	0.1us-gaap_WeightedAverageCostInventoryAmount / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember	0.3us-gaap_WeightedAverageCostInventoryAmount / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember
Natural Gas
Public Utilities, Inventory [Line Items]
Weighted average cost inventory amount	0.1us-gaap_WeightedAverageCostInventoryAmount / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryNaturalGasMember	0.8us-gaap_WeightedAverageCostInventoryAmount / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryNaturalGasMember	0.2us-gaap_WeightedAverageCostInventoryAmount / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryNaturalGasMember
Propane
Public Utilities, Inventory [Line Items]
Weighted average cost inventory amount	$ 0.2us-gaap_WeightedAverageCostInventoryAmount / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryPropaneMember	$ 0.2us-gaap_WeightedAverageCostInventoryAmount / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryPropaneMember	$ 0.1us-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

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