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Rates and Other Regulatory Activities - Additional Information (Detail)
12 Months Ended
Dec. 31, 2023
USD ($)
Dekatherm
mi
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Rates and Other Regulatory Activities [Line Items]      
Regulatory Assets $ 115,902,000 $ 149,653,000  
Revenues 670,604,000 680,704,000 $ 569,968,000
Interim Rates 7,700,000    
Annual Rate Case Recovery 17,200,000    
COVID-19 Regulatory Asset 200,000 1,200,000  
RSAM 25,000,000    
Regulatory Liabilities 208,998,000 148,020,000  
Cost Recovery Storm Protection Plan 13,600,000    
Gas Utility Access and Replacement Directive Related Capital Expenditures 205,000,000    
Storm reserve      
Rates and Other Regulatory Activities [Line Items]      
Regulatory Liabilities [1] 1,900,000 2,845,000  
Underrecovered purchased fuel costs      
Rates and Other Regulatory Activities [Line Items]      
Regulatory Assets [2] 13,696,000 $ 43,583,000  
Maryland Natural Gas Distribution Businesses [Member]      
Rates and Other Regulatory Activities [Line Items]      
Permanent Rates 6,900,000    
Florida Public Utilities Company [Member]      
Rates and Other Regulatory Activities [Line Items]      
COVID-19 Settlement Amount 2,100,000    
West Palm Beach Florida | Minimum [Member]      
Rates and Other Regulatory Activities [Line Items]      
Environmental Exit Costs, Reasonably Possible Additional Loss 1,900,000    
West Palm Beach Florida | Maximum [Member]      
Rates and Other Regulatory Activities [Line Items]      
Environmental Exit Costs, Reasonably Possible Additional Loss 3,200,000    
Florida Natural Gas Distribution [Member]      
Rates and Other Regulatory Activities [Line Items]      
Permanent Rates 24,100,000    
Florida City Gas      
Rates and Other Regulatory Activities [Line Items]      
Total Base Revenue 23,300,000    
Rate Increase 14,100,000    
Base Rate Increase Base - SAFE investments transfer to base rates 5,300,000    
Base Rate Increase - liquefied natural gas facility 3,800,000    
Florida City Gas | Storm reserve      
Rates and Other Regulatory Activities [Line Items]      
Regulatory Liabilities $ 800,000    
Beachside Expansion | Peninsula Pipeline Company      
Rates and Other Regulatory Activities [Line Items]      
Additional Firm Natural Gas Transportation Deliverability | Dekatherm 10,176    
Number of Mainline Pipeline Miles | mi 11.3    
Twin Lakes Expansion | Peninsula Pipeline Company      
Rates and Other Regulatory Activities [Line Items]      
Additional Firm Natural Gas Transportation Deliverability | Dekatherm 2,400    
Ocean City Maryland Reinforcement | Maryland Natural Gas [Member]      
Rates and Other Regulatory Activities [Line Items]      
Number of Mainline Pipeline Miles | mi 5.4    
Lake Wales Pipeline Acquisition | Peninsula Pipeline Company      
Rates and Other Regulatory Activities [Line Items]      
Additional Firm Natural Gas Transportation Deliverability | Dekatherm 9,000    
Newberry Expansion | Peninsula Pipeline Company      
Rates and Other Regulatory Activities [Line Items]      
Additional Firm Natural Gas Transportation Deliverability | Dekatherm 8,000    
East Coast Reinforcement Projects: Boynton Beach | Peninsula Pipeline Company      
Rates and Other Regulatory Activities [Line Items]      
Additional Firm Natural Gas Transportation Deliverability | Dekatherm 15,000    
East Coast Reinforcement Projects: New Smyrna Beach | Peninsula Pipeline Company      
Rates and Other Regulatory Activities [Line Items]      
Additional Firm Natural Gas Transportation Deliverability | Dekatherm 3,400    
Elkton Gas [Member] | Regulated Energy [Member]      
Rates and Other Regulatory Activities [Line Items]      
Number of customers acquired through acquisition 7,000    
[1] We have storm reserves in our Florida regulated energy operations and self-insurance for our regulated energy operations that allow us to collect through rates amounts to be used against general claims, storm restoration costs and other losses as they are incurred.
[2] We are allowed to recover the asset or are required to pay the liability in rates. We do not earn an overall rate of return on these assets.
(2) At December 31, 2022, includes $21.2 million being recovered over a three year period primarily concentrated in our electric division. Per Florida PSC approval, our electric division was allowed to recover these amounts over an extended period of time in an effort to reduce the impact of increased commodity prices to our customers. Recovery of these costs began in January 2023.