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Components of Gas Inventory (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Public Utilities, Inventory [Line Items]
Weighted average cost inventory amount	$ 1.0	$ 1.2	$ 1.2
Natural Gas
Public Utilities, Inventory [Line Items]
Weighted average cost inventory amount	0.8	0.8	0.8
Propane
Public Utilities, Inventory [Line Items]
Weighted average cost inventory amount	0.1	0.3	0.3
Liquefied Natural Gas & Other
Public Utilities, Inventory [Line Items]
Weighted average cost inventory amount	$ 0.1	$ 0.1	$ 0.1

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X

- 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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