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Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail) | 12 Months Ended
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Dec. 31, 2018
Minimum | Propane Distribution Mains [Member] |
Useful Life of Assets | 10 years
Minimum | Propane Bulk Plants And Tanks [Member] |
Useful Life of Assets | 10 years
Minimum | Liquefied Petroleum Gas Equipment [Member] |
Useful Life of Assets | 5 years
Minimum | Meters And Meter Installations [Member] |
Useful Life of Assets | 5 years
Minimum | Measuring And Regulating Station Equipment [Member] |
Useful Life of Assets | 5 years
Minimum | Natural gas processing equipment [Member] |
Useful Life of Assets | 20 years
Minimum | Office Furniture And Equipment [Member] |
Useful Life of Assets | 3 years
Minimum | Transportation Equipment [Member] |
Useful Life of Assets | 4 years
Minimum | Structures And Improvements [Member] |
Useful Life of Assets | 5 years
Maximum | Propane Distribution Mains [Member] |
Useful Life of Assets | 37 years
Maximum | Propane Bulk Plants And Tanks [Member] |
Useful Life of Assets | 40 years
Maximum | Liquefied Petroleum Gas Equipment [Member] |
Useful Life of Assets | 33 years
Maximum | Meters And Meter Installations [Member] |
Useful Life of Assets | 33 years
Maximum | Measuring And Regulating Station Equipment [Member] |
Useful Life of Assets | 37 years
Maximum | Natural gas pipelines [Member] |
Useful Life of Assets | 45 years
Maximum | Natural gas processing equipment [Member] |
Useful Life of Assets | 25 years
Maximum | Office Furniture And Equipment [Member] |
Useful Life of Assets | 10 years
Maximum | Transportation Equipment [Member] |
Useful Life of Assets | 20 years
Maximum | Structures And Improvements [Member] |
Useful Life of Assets | 45 years

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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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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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