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.