Derivative Instruments - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Sep. 30, 2025	Dec. 31, 2023	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Derivative [Line Items]
Energy Marketing Contracts Assets, Current		$ 100		$ 100	$ 600
Energy Marketing Contract Liabilities, Current		(500)		(500)	0
Notional Amount of Nonderivative Instruments	$ 40,000	50,000	$ 30,000	50,000
Notional Amount Nonderivative Instruments, Total			$ 60,000
Designated as Hedging Instrument [Member] | Mark To Market Energy Assets [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Energy Marketing Contracts Assets, Current		0		0	100
Designated as Hedging Instrument [Member] | Mark To Market Energy Assets [Member] | Propane Swap Agreement [Member]
Derivative [Line Items]
Energy Marketing Contracts Assets, Current		100		100	600
Designated as Hedging Instrument [Member] | Mark-to-market energy liabilities [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Energy Marketing Contract Liabilities, Current		(1,500)		(1,500)	(100)
Designated as Hedging Instrument [Member] | Mark-to-market energy liabilities [Member] | Propane Swap Agreement [Member]
Derivative [Line Items]
Energy Marketing Contract Liabilities, Current		(300)		(300)	0
Sharp Energy Inc [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months				$ (200)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer				12 months
Other Payables to Broker-Dealers and Clearing Organizations		$ 2,400		$ 2,400	$ 1,900
Interest Rate Swap Rate, High Range [Member]
Derivative [Line Items]
Fixed Swap Rate		3.97%	0.205%	3.97%	0.17%	3.98%
Interest Rate Swap Rate, Low Range [Member]
Derivative [Line Items]
Fixed Swap Rate			0.20%