Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment by Classification (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) mi	Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Contributions in Aid of Construction	$ 4,200	$ 7,600
Number of Months to Establish ROU Asset and Liability	12 months
Property, plant and equipment
Total property, plant and equipment	$ 2,859,611	2,226,104
Less: Accumulated depreciation and amortization	(516,429)	(462,926)
Net property, plant and equipment	2,456,374	1,810,473
Construction Work in Progress	113,192	47,295
Jointly Owned Pipeline [Member]
Property, plant and equipment
Net property, plant and equipment	28,400
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment	2,200	1,500
Natural Gas Distribution [Member] | Delmarva and Florida [Member]
Property, plant and equipment
Total property, plant and equipment	1,486,796	925,501
Natural Gas Transmission [Member] | Delmarva Peninsula, Pennsylvania and Florida [Member]
Property, plant and equipment
Total property, plant and equipment	788,185	741,865
Natural Gas Transmission [Member] | OHIO
Property, plant and equipment
Total property, plant and equipment	134,192	128,620
Electric distribution | Florida
Property, plant and equipment
Total property, plant and equipment	143,513	135,633
Propane Operations [Member] | Mid-Atlantic and Florida [Member]
Property, plant and equipment
Total property, plant and equipment	194,918	185,090
Electricity and Steam Generation [Member] | Florida
Property, plant and equipment
Total property, plant and equipment	37,064	36,886
Mobile CNG Utility and Pipeline Solutions [Member] | Florida
Property, plant and equipment
Total property, plant and equipment	40,558	38,543
Other
Property, plant and equipment
Total property, plant and equipment	30,309	29,890
Other unregulated energy | Other [Member]
Property, plant and equipment
Total property, plant and equipment	$ 4,076	$ 4,076
Natural Gas Operations
Property, plant and equipment
Miles Of Natural Gas Pipeline | mi	26