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Other Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Subsequent Event [Line Items]  
Intercompany Agreements, Description three years
Debt Service Coverage Ratio 1.25
Time to cure ratio 5 days
Ratio based on average number of prior quarters 6
Funds from operations interest coverage ratio minimum times 2
Total debt to capital maximum 65
Number Of Years to Collect Benefits 20 years
Total purchase obligations for 2018 $ 89,557
Total purchase obligations for 2019 - 2020 82,412
Total purchase obligations for 2021 - 2022 70,114
Total purchase obligations thereafter 174,203
Aggregate guaranteed amount 20,000
Guarantor Obligations, Current Carrying Value 13,100
Amount of letter of credit to our current primary insurance company $ 5,300
Florida Natural Gas Distribution and Eight Flags [Member]  
Subsequent Event [Line Items]  
Number of Years for Asset Management Agreement 10 years