Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands		Dec. 31, 2019		Dec. 31, 2018
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross		$ 12,365		$ 7,316
Finite-Lived Intangible Assets, Accumulated Amortization		4,236		3,466
Goodwill		32,668		21,568
Boulden [Member] | Unregulated Energy
Goodwill [Line Items]
Goodwill	[1]	11,200
Florida Natural Gas Distribution [Member] | Regulated Energy
Goodwill [Line Items]
Goodwill	[2]	3,353		3,353
Mid-Atlantic Propane Operations [Member] | Unregulated Energy
Goodwill [Line Items]
Goodwill		13,299	[1]	2,147
Florida Propane Operations [Member] | Unregulated Energy
Goodwill [Line Items]
Goodwill		1,188		1,188
Aspire Energy | Unregulated Energy
Goodwill [Line Items]
Goodwill		10,120		10,120
Marlin Gas Services [Member] | Unregulated Energy
Goodwill [Line Items]
Goodwill		4,708		4,760
Customer Lists [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross		9,391		4,801
Finite-Lived Intangible Assets, Accumulated Amortization		3,463		3,066
Noncompete Agreements [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross		2,252		1,793
Finite-Lived Intangible Assets, Accumulated Amortization		451		202
Patents [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross		452		452
Finite-Lived Intangible Assets, Accumulated Amortization		118		0
Other Intangible Assets [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross		270		270
Finite-Lived Intangible Assets, Accumulated Amortization		$ 204		$ 198

[1] ⁽³⁾ Mid-Atlantic Propane Operations goodwill balance includes $11.2 million recognized as a result of the purchase of the operating assets of Boulden in December 2019.

[2] ⁽¹⁾ Florida Natural Gas Distribution includes Chesapeake Utilities' Central Florida Gas division, FPU and FPU's Indiantown and Fort Meade divisions.