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Rates and Other Regulatory Activities - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2020 USD ($) customer Dekatherm mi
Rates and Other Regulatory Activities [Line Items] |
Regulatory Asset - Storm Cost Recovery | $ 45,800,000
Surcharge - Storm Cost Recovery | 7,700,000
Incremental Revenue - Storm Cost Recovery | $ 3,300,000
Electric Limited Proceedings [Member] |
Rates and Other Regulatory Activities [Line Items] |
Extent of Customers Losing Service | 100.00%
Asset Recovery Damaged Property Costs, Noncurrent | $ 1,500,000
Deferred Storm and Property Reserve Deficiency, Noncurrent | 800,000
Amounts Spent to Restore Service | 65,000,000.0
Hurricane Dorrian [Member] |
Rates and Other Regulatory Activities [Line Items] |
Asset Recovery Damaged Property Costs, Noncurrent | $ 1,200,000
Regulatory Liability, Amortization Period | 30 years
Regulatory Liability, Amortization Period, Revised | 10 years
Eastern Shore [Member] |
Rates and Other Regulatory Activities [Line Items] |
Cost Recovery, Capital | $ 500,000
Callahan Pipeline [Domain] | Peninsula Pipeline Company [Member] |
Rates and Other Regulatory Activities [Line Items] |
Number of Pipeline Miles | mi | 26
Callahan Project [Member] | Peninsula Pipeline [Member] |
Rates and Other Regulatory Activities [Line Items] |
Diameter of Pipe | mi | 16
Del-Mar Pathway Project [Member] | Eastern Shore [Member] |
Rates and Other Regulatory Activities [Line Items] |
Number of Mainline Pipeline Miles | mi | 13
Additional Firm Natural Gas Transportation Deliverability | Dekatherm | 14,300
number of customers | customer | 4
Number of Pipeline Miles | mi | 6
Fort Meade and Indiantown Divisions [Member] |
Rates and Other Regulatory Activities [Line Items] |
Regulatory Liabilities | $ 309,000
Delaware natural gas division [Member] |
Rates and Other Regulatory Activities [Line Items] |
One time bill credit related to TCJA | 1,500,000
Regulatory Liabilities | 12,758,000
Eastern Shore [Member] |
Rates and Other Regulatory Activities [Line Items] |
One time bill credit related to TCJA | 900,000
Regulatory Liabilities | 34,190,000
Florida Public Utilities Company [Member] |
Rates and Other Regulatory Activities [Line Items] |
Regulatory Liabilities | 19,192,000
Central Florida Gas Division [Member] |
Rates and Other Regulatory Activities [Line Items] |
Regulatory Liabilities | 8,214,000
Maryland Division [Member] |
Rates and Other Regulatory Activities [Line Items] |
One time bill credit related to TCJA | 365,000
Regulatory Liabilities | 4,000,000
Sandpiper [Member] |
Rates and Other Regulatory Activities [Line Items] |
One time bill credit related to TCJA | 608,000
Regulatory Liabilities | 3,726,000
FPU electric division [Member] |
Rates and Other Regulatory Activities [Line Items] |
Regulatory Liabilities | 6,758,000
Elkton Gas [Member] |
Rates and Other Regulatory Activities [Line Items] |
One time bill credit related to TCJA | 47,000
Regulatory Liabilities | $ 1,124,000
Regulated Energy [Member] | Elkton Gas [Member] |
Rates and Other Regulatory Activities [Line Items] |
Number of customers acquired through acquisition | 7,000

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- Definition Carrying amount as of the balance sheet date of the portion of the reserved funds established by a utility from customer payments to cover the repair costs of damages from major storms, which repairs are expected to be incurred beyond one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77907324&loc=d3e43603-110378 + Details
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