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Environmental Commitments and Contingencies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2023
USD ($)
site
Dec. 31, 2022
USD ($)
Environmental Commitments And Contingencies [Line Items]    
Companys Exposure In Number Of Former Manufactured Gas Plant Sites | site 7  
Environmental liabilities $ 2,607,000 $ 3,272,000
Environmental Commitments and Contingencies ENVIRONMENTAL COMMITMENTS AND CONTINGENCIES
We are subject to federal, state and local laws and regulations governing environmental quality and pollution control. These laws and regulations require us to remove or remediate, at current and former operating sites, the effect on the environment of the disposal or release of specified substances.
MGP Sites
We have participated in the investigation, assessment or remediation of, and have exposures at, seven former MGP sites. We have received approval for recovery of clean-up costs in rates for sites located in Salisbury, Maryland; Seaford, Delaware; and Winter Haven, Key West, Pensacola, Sanford and West Palm Beach, Florida.
As of December 31, 2023 and 2022, we had approximately $3.6 million and $4.3 million, respectively, in environmental liabilities, related to the former MGP sites. As of December 31, 2023 and 2022, we have cumulative regulatory assets of $0.5 million and $0.8 million, respectively, for future recovery of environmental costs from customers. Specific to FPU's four MGP sites in Key West, Pensacola, Sanford and West Palm Beach, FPU has approval for and has recovered, through a combination of insurance and customer rates, $14.0 million of its environmental costs related to its MGP sites as of December 31, 2023.
Environmental liabilities for our MGP sites are recorded on an undiscounted basis based on the estimate of future costs provided by independent consultants. We continue to expect that all costs related to environmental remediation and related activities, including any potential future remediation costs for which we do not currently have approval for regulatory recovery, will be recoverable from customers through rates.
Remediation is ongoing for the MGP's in Winter Haven and Key West in Florida and in Seaford, Delaware and the remaining clean-up costs are estimated to be between $0.3 million to $0.9 million for these three sites. The Environmental Protection Agency has approved a "site-wide ready for anticipated use" status for the Sanford, Florida MGP site, which is the final step before delisting a site. The remaining remediation expenses for the Sanford MGP site are immaterial.
The remedial actions approved by the Florida Department of Environmental Protection have been implemented on the east parcel of our West Palm Beach Florida site. Similar remedial actions have been initiated on the site's west parcel, and construction of active remedial systems are expected to be completed in 2024. Remaining remedial costs for West Palm Beach, including completion of the construction of the system on the West Parcel, five to ten years of operation, maintenance and monitoring, and final site work for closeout of the property, is estimated to be between $1.9 million and $3.2 million.
  
Manufactured Gas Plant    
Environmental Commitments And Contingencies [Line Items]    
Regulatory assets for future recovery of environmental costs $ 500,000 800,000
West Palm Beach Florida | Maximum    
Environmental Commitments And Contingencies [Line Items]    
Environmental Exit Costs, Reasonably Possible Additional Loss 3,200,000  
West Palm Beach Florida | Minimum    
Environmental Commitments And Contingencies [Line Items]    
Environmental Exit Costs, Reasonably Possible Additional Loss 1,900,000  
Seaford | Maximum    
Environmental Commitments And Contingencies [Line Items]    
Environmental Exit Costs, Reasonably Possible Additional Loss 900,000  
Seaford | Minimum    
Environmental Commitments And Contingencies [Line Items]    
Environmental Exit Costs, Reasonably Possible Additional Loss 300,000  
Florida Natural Gas Distribution [Member]    
Environmental Commitments And Contingencies [Line Items]    
Permanent Rates 24,100,000  
Maryland Natural Gas Distribution Businesses [Member]    
Environmental Commitments And Contingencies [Line Items]    
Permanent Rates 6,900,000  
Florida City Gas    
Environmental Commitments And Contingencies [Line Items]    
Rate Increase 14,100,000  
FPU    
Environmental Commitments And Contingencies [Line Items]    
Environmental liabilities 3,600,000 $ 4,300,000
Approval of recovery of environmental costs $ 14,000,000