Other Commitments and Contingencies - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Other Commitments [Line Items]
Debt Service Coverage Ratio	1.25
Debt Service Coverage Ratio Measurement Period	12
Maximum Days To Make Default Good	5 days
Ratios based on average of the prior quarters	1 year 6 months
Number Of Years For Power Purchase Agreement	20 years
Contract Duration	20 years
Aggregate guaranteed amount	$ 35.0
Guarantor Obligations, Current Carrying Value	27.5
Draws on letters of credit	6.3
Specific Purpose
Other Commitments [Line Items]
Guarantor Obligations, Current Carrying Value	$ 4.0
Delmarva [Member]
Other Commitments [Line Items]
Number of Years for Asset Management Agreement	3 years