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Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill |  | $ 25,837 | $ 19,604
Florida Natural Gas Distribution [Member] | Regulated Energy |  |  |
Goodwill [Line Items] |  |  |
Goodwill | [1] | 3,353 | 3,353
Mid-Atlantic Propane Operations [Member] | Unregulated Energy |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 2,147 | 674
Florida Propane Operations [Member] | Unregulated Energy |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 1,188 | 1,188
Aspire Energy | Unregulated Energy |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 10,119 | 10,119
Marlin Gas Services [Member] | Unregulated Energy |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 4,760 | 0
PESCO - Natural Gas Marketing [Member] | Unregulated Energy |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | $ 4,270 | $ 4,270
[1] | (1) Florida natural gas distribution includes Chesapeake Utilities' Central Florida Gas division, FPU and FPU's Indiantown and Fort Meade divisions.

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