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Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail) | 12 Months Ended
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Dec. 31, 2012
Minimum [Member] | Propane distribution mains [Member] |
Useful Life of Assets | 10 years
Minimum [Member] | Propane bulk plants and tanks [Member] |
Useful Life of Assets | 7 years
Minimum [Member] | Liquified petroleum gas equipment [Member] |
Useful Life of Assets | 5 years
Minimum [Member] | Meters and meter installations [Member] |
Useful Life of Assets | 5 years
Minimum [Member] | Measuring and regulating station equipment [Member] |
Useful Life of Assets | 5 years
Minimum [Member] | Office furniture and equipment [Member] |
Useful Life of Assets | 3 years
Minimum [Member] | Transportation equipment [Member] |
Useful Life of Assets | 3 years
Minimum [Member] | Structures and improvements [Member] |
Useful Life of Assets | 3 years
Maximum [Member] | Propane distribution mains [Member] |
Useful Life of Assets | 37 years
Maximum [Member] | Propane bulk plants and tanks [Member] |
Useful Life of Assets | 40 years
Maximum [Member] | Liquified petroleum gas equipment [Member] |
Useful Life of Assets | 40 years
Maximum [Member] | Meters and meter installations [Member] |
Useful Life of Assets | 33 years
Maximum [Member] | Measuring and regulating station equipment [Member] |
Useful Life of Assets | 37 years
Maximum [Member] | Office furniture and equipment [Member] |
Useful Life of Assets | 10 years
Maximum [Member] | Transportation equipment [Member] |
Useful Life of Assets | 20 years
Maximum [Member] | Structures and improvements [Member] |
Useful Life of Assets | 45 years
Maximum [Member] | Other equipment [Member] |
Useful Life of Assets | Various

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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