Environmental Commitments and Contingencies - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2024 USD ($) site	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Environmental Commitments And Contingencies [Line Items]
Company's exposure in number of former Manufactured Gas Plant Sites | site	7
Environmental liabilities	$ 2,402,000		$ 2,607,000
West Palm Beach Florida [Member] | Minimum [Member]
Environmental Commitments And Contingencies [Line Items]
Estimated costs of remediation range, minimum	3,300,000
West Palm Beach Florida [Member] | Maximum [Member]
Environmental Commitments And Contingencies [Line Items]
Estimated costs of remediation range, minimum	5,700,000
Seaford [Member] | Minimum [Member]
Environmental Commitments And Contingencies [Line Items]
Estimated costs of remediation range, minimum	300,000
Seaford [Member] | Maximum [Member]
Environmental Commitments And Contingencies [Line Items]
Estimated costs of remediation range, minimum	800,000
Manufactured Gas Plant [Member]
Environmental Commitments And Contingencies [Line Items]
Regulatory Assets for future recovery of environmental costs	300,000		$ 500,000
FPU [Member]
Environmental Commitments And Contingencies [Line Items]
Environmental liabilities	$ 3,400,000	$ 3,600,000