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Environmental Commitments and Contingencies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | $ 7,638,000 | $ 8,263,000 |
Amount paid for funding requirements | 625,000 | $ 329,000 | $ 350,000
West Palm Beach Florida | Maximum |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Exit Costs, Reasonably Possible Additional Loss | 15,400,000 |  |
West Palm Beach Florida | Minimum |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Exit Costs, Reasonably Possible Additional Loss | 4,500,000 |  |
Winter Haven Florida | Maximum |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Remediation Expense | 425,000 |  |
Seaford | Maximum |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Exit Costs, Reasonably Possible Additional Loss | 465,000 |  |
Seaford | Minimum |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Exit Costs, Reasonably Possible Additional Loss | 273,000 |  |
FPU |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | 9,100,000 |  |
Approval of recovery of environmental costs | 14,000,000 |  |
Environmental costs recovered | 11,500,000 |  |
FPU | Manufactured Gas Plant |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Regulatory assets for future recovery of environmental costs | $ 2,500,000 |  |
FPU | Sanford Florida |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental remediation expense percent | 5.00% |  |
Environmental Remediation Expense | $ 24,000 |  |
Number of Years to ensure remedy | 5 |  |
FPU | Sanford Florida | Maximum |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Exit Costs, Reasonably Possible Additional Loss | $ 13,000,000 |  |
FPU | Sanford Florida | Minimum |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Exit Costs, Reasonably Possible Additional Loss | $ 650,000 |  |

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