Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross		$ 26,159	$ 19,967
Finite-Lived Intangible Assets, Accumulated Amortization		8,300	6,775
Goodwill		46,213	44,708
Goodwill, Transfers	[1]	1,505
Regulated Energy
Goodwill [Line Items]
Goodwill		7,689	7,689
Goodwill, Transfers		0
Unregulated Energy
Goodwill [Line Items]
Goodwill		38,524	37,019
Goodwill, Transfers		1,505
Customer Lists [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	[2]	16,965	16,814
Finite-Lived Intangible Assets, Accumulated Amortization	[2]	6,131	5,125
Customer Lists [Member] | Diversified Energy
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross		6,100
Noncompete Agreements [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross		3,105	2,431
Finite-Lived Intangible Assets, Accumulated Amortization		1,411	1,078
Patents [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	[3],[4]	5,819	452
Finite-Lived Intangible Assets, Accumulated Amortization	[3],[4]	533	354
Other Intangible Assets [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross		270	270
Finite-Lived Intangible Assets, Accumulated Amortization		$ 225	$ 218

[1] (1)Includes goodwill from the purchase of operating assets of Planet Found in the fourth quarter of 2022.

[2] 1) The customer relationship amounts include $6.1 million as a result of the purchase of Diversified Energy in December 2021.

[3] (3) Includes amounts related to patented technology developed by Marlin Gas Services and the acquisition of Planet Found

[4] (2) The patents amount include $3.7 million as a result of the purchase of the operating assets of Planet Found in October 2022.