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Rates and Other Regulatory Activities - Additional Information (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Dekatherm
mi
Dec. 31, 2021
USD ($)
Rates and Other Regulatory Activities [Line Items]    
COVID-19 Regulatory Asset $ 2,000 $ 2,300
Florida Public Utilities Company [Member]    
Rates and Other Regulatory Activities [Line Items]    
COVID-19 Settlement Amount 2,100  
Delaware natural gas division [Member]    
Rates and Other Regulatory Activities [Line Items]    
Regulatory Liabilities 12,551 12,591
Maryland Division [Member]    
Rates and Other Regulatory Activities [Line Items]    
Regulatory Liabilities 3,806 3,840
Sandpiper [Member]    
Rates and Other Regulatory Activities [Line Items]    
Regulatory Liabilities 3,641 3,656
Central Florida Gas Division [Member]    
Rates and Other Regulatory Activities [Line Items]    
Regulatory Liabilities 7,986 8,032
Florida Public Utilities Company [Member]    
Rates and Other Regulatory Activities [Line Items]    
Regulatory Liabilities 19,086 19,189
Fort Meade and Indiantown Divisions [Member]    
Rates and Other Regulatory Activities [Line Items]    
Regulatory Liabilities 268 271
FPU electric division [Member]    
Rates and Other Regulatory Activities [Line Items]    
Regulatory Liabilities 5,176 5,237
Eastern Shore Gas Company [Member]    
Rates and Other Regulatory Activities [Line Items]    
Regulatory Liabilities 34,190 34,190
Elkton Gas [Member]    
Rates and Other Regulatory Activities [Line Items]    
Regulatory Liabilities $ 1,091 $ 1,091
Beachside Expansion | Peninsula Pipeline Company [Member]    
Rates and Other Regulatory Activities [Line Items]    
Number of Mainline Pipeline Miles | mi 11.3  
Additional Firm Natural Gas Transportation Deliverability | Dekatherm 10,176  
Winter Haven Expansion | Peninsula Pipeline Company [Member]    
Rates and Other Regulatory Activities [Line Items]    
Additional Firm Natural Gas Transportation Deliverability | Dekatherm 6,800