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Rates and Other Regulatory Activities - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) mi | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) dekatherm / d unit mi | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted Payment | $ 201,500,000 |  |  |  |  |  |  |  | $ 201,500,000 |  |
Regulatory Assets | 77,218,000 |  |  |  | $ 86,505,000 |  |  |  | $ 77,218,000 | $ 86,505,000 |
Florida Appeal Period for Federal Tax Reform Impact |  |  |  |  |  |  |  |  | 30 days |  |
Revenues | $ 201,190,000 | $ 140,279,000 | $ 136,664,000 | $ 239,356,000 | $ 180,403,000 | $ 126,936,000 | $ 125,084,000 | $ 185,160,000 | $ 717,489,000 | $ 617,583,000 | $ 498,860,000
Electric Limited Proceedings [Member] |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  | $ 1.82 |  |
Number of Years to Recover Storm Related Costs |  |  |  |  |  |  |  |  | 2 years |  |
Extent of Customers Losing Service |  |  |  |  |  |  |  |  | 100.00% |  |
Amounts Spent to Restore Service |  |  |  |  |  |  |  |  | $ 60,000,000 |  |
Number of Term Notes Issued for Hurricane Michael | 2 |  |  |  |  |  |  |  | 2 |  |
Number of Months for Term Notes to Finance Hurricane Michael |  |  |  |  |  |  |  |  | 13 months |  |
Dollar Amount of Term Notes to Finance Hurricane Michael Costs |  |  |  |  |  |  |  |  | $ 30,000,000 |  |
Asset Recovery Damaged Property Costs, Noncurrent | $ 1,500,000 |  |  |  |  |  |  |  | 1,500,000 |  |
Deferred Storm and Property Reserve Deficiency, Noncurrent | 779,000 |  |  |  |  |  |  |  | 779,000 |  |
Electric distribution |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved | 15,200,000 |  |  |  |  |  |  |  | 15,200,000 |  |
Eastern Shore Gas Company |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in Revenue Recognized Due to Motion Rate in Effect | $ 3,700,000 |  |  |  |  |  |  |  | $ 3,700,000 |  |
Eastern Shore Gas Company | 2017 Expansion Project [Member] |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
firm natural gas transportation deliverability | dekatherm / d |  |  |  |  |  |  |  |  | 61,162 |  |
Additional Firm Natural Gas Transportation Deliverability | dekatherm / d |  |  |  |  |  |  |  |  | 52,500 |  |
Number of Pipeline Miles | mi | 23 |  |  |  |  |  |  |  | 23 |  |
Miles Of Natural Gas Pipeline | mi | 17 |  |  |  |  |  |  |  | 17 |  |
Pressure Control Stations |  |  |  |  |  |  |  |  | 2 |  |
Eastern Shore Gas Company | Del-Mar Pathway Project [Domain] |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
firm natural gas transportation deliverability | dekatherm / d |  |  |  |  |  |  |  |  | 14,300 |  |
Eastern Shore Gas Company | Del-Mar Pathway Project [Member] |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Pipeline Miles | mi | 6 |  |  |  |  |  |  |  | 6 |  |
number of customers |  |  |  |  |  |  |  |  | 4 |  |
Number of Mainline Pipeline Miles | mi | 13 |  |  |  |  |  |  |  | 13 |  |
Florida Public Utilities Company [Member] |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted Payment | $ 2,500,000 |  |  |  |  |  |  |  | $ 2,500,000 |  |
Business Acquisition Premium Paid | $ 34,200,000 |  |  |  |  |  |  |  | $ 34,200,000 |  |
Subscribers [Member] | Eastern Shore Gas Company | 2017 Expansion Project [Member] |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
number of customers |  |  |  |  |  |  |  |  | 7 |  |
Number of affiliates | unit |  |  |  |  |  |  |  |  | 3 |  |
Pre TCJA approved revenue requirements [Member] | Eastern Shore Gas Company |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  | $ 9,800,000 |  |
Post TCJA approved revenue requirements [Member] | Eastern Shore Gas Company |  |  |  |  |  |  |  |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  | $ 6,600,000 |  |

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