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Other Commitments and Contingencies - Additional Information (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($)
Other Commitments [Line Items] |
Debt Service Coverage Ratio | 1.25
Debt Service Coverage Ratio Measurement Period | 12
Maximum Days To Make Default Good | 5 days
Ratio based on average number of prior quarters | 6
Ratios based on average of the prior quarters | 1 year 6 months
Funds from operations interest coverage ratio minimum times | 2
Total debt to capital maximum | 0.65
Number Of Years For Power Purchase Agreement | 20 years
Contract Duration | 20 years
Aggregate guaranteed amount | $ 20.0
Guarantor Obligations, Current Carrying Value | 7.9
Draws on letters of credit | $ 4.8
Florida Natural Gas Distribution and Eight Flags [Member] |
Other Commitments [Line Items] |
Number of Years for Asset Management Agreement | 10 years
Delmarva [Member] |
Other Commitments [Line Items] |
Number of Years for Asset Management Agreement | 3 years

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