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Long-Term Debt - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |
Long-term debt maturities repayment of principal in next twelve months | $ 10,600,000
Long-term debt maturities repayment of principal in year two | 45,600,000
Long-term debt maturities repayment of principal in year three | 13,600,000
Long-term debt maturities repayment of principal in year four | 25,100,000
Long-term debt maturities repayment of principal in year five | 20,600,000
Long-term debt maturities repayment of principal in year five thereafter | 211,700,000
Debt Instrument, Unused Borrowing Capacity, Amount | $ 250,000,000
Percentage of equity of total capitalization | 40.00%
Fixed charge coverage ratio | 1.2
Required net book value of regulated business assets, minimum percentage of consolidated total assets | 50.00%
Maximum limit on payment of dividends | 10.0
Cumulative consolidated net income base | $ 444,300,000
Cumulative net income with restrictions | 201,500,000
Cumulative net income free of restrictions | 242,800,000
Restricted net assets of consolidated subsidiaries | $ 42,200,000
Percentage of restricted net assets | 8.00%
Term Note Due January Two Thousand Twenty [Member] |
Debt Instrument [Line Items] |
Long-term debt, interest percentage | 3.23%
Uncollateralized Senior Note Due On Two Thousand Twenty Six [Member] |
Debt Instrument [Line Items] |
Long-term debt, interest percentage | 5.68%
First Mortgage Bond Due On Two Thousand Twenty Two [Member] |
Debt Instrument [Line Items] |
Long-term debt, interest percentage | 9.08%
Cumulative consolidated net income base | $ 155,834,240
Cumulative net income with restrictions | (37,600,000)
Cumulative net income free of restrictions | $ 118,200,000
Uncollateralized Senior Note Due On May 2 Two Thousand Twenty Eight [Member] |
Debt Instrument [Line Items] |
Long-term debt, interest percentage | 6.43%
Uncollateralized Senior Note Two Due on December Two Thousand Twenty Eight [Member] |
Debt Instrument [Line Items] |
Long-term debt, interest percentage | 3.73%
Uncollateralized Senior Notes Due On Two Thousand Twenty Nine [Member] |
Debt Instrument [Line Items] |
Long-term debt, interest percentage | 3.88%
Uncollateralized Senior Note One Due On Two Thousand Seventeen [Member] |
Debt Instrument [Line Items] |
Long-term debt, interest percentage | 6.64%
Uncollateralized Senior Note Due On Two Thousand Twenty [Member] |
Debt Instrument [Line Items] |
Long-term debt, interest percentage | 5.50%
Uncollateralized Senior Note Due On Two Thousand Twenty Three [Member] |
Debt Instrument [Line Items] |
Long-term debt, interest percentage | 5.93%
Florida Public Utilities Company [Member] |
Debt Instrument [Line Items] |
Cumulative net income with restrictions | $ 2,500,000

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