Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 26,957	$ 26,159
Acquired finite-lived intangible assets, weighted average useful life	14 years
Goodwill	$ 508,174	46,213
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	1,800
Amortization of intangible assets	1,800	1,500	$ 1,300
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1,500
Amortization of intangible assets, 2020	1,600
Amortization of intangible assets, 2022	1,300
Regulated Energy
Goodwill [Line Items]
Goodwill	468,714	7,689
Unregulated Energy
Goodwill [Line Items]
Goodwill	39,460	38,524
Customer list
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 17,004	16,965
Customer list | Minimum [Member]
Goodwill [Line Items]
Amortized period of acquired intangible assets	5 years
Noncompete Agreements [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 3,125	$ 3,105