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Environmental Commitments and Contingencies - Additional Information (Detail) | 3 Months Ended |
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Mar. 31, 2016 USD ($) site claim | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Environmental Commitments And Contingencies [Line Items] |  |  |
Company's exposure in number of former Manufactured Gas Plant Sites | site | 7 |  |
Environmental liabilities | $ 8,843,000 |  | $ 8,942,000
Amount paid for funding requirements | 99,000 | $ 49,000 |
Seaford [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | 273,000 |  |
Accrual for Environmental Loss Contingencies | 186,000 |  |
Regulatory Assets | 269,000 |  |
Estimated costs of remediation range, minimum | 273,000 |  |
Estimated costs of remediation range, maximum | 465,000 |  |
Winter Haven Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental remediation expense | 443,000 |  |
Additional remediation costs | 100,000 |  |
Salisbury Maryland [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Maximum Costs Of Monitoring Well | 5,000 |  |
West Palm Beach Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Estimated costs of remediation range, minimum | 4,500,000 |  |
Estimated costs of remediation range, maximum | 15,400,000 |  |
Sanford Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Estimated costs of remediation range, maximum | 13,000,000 |  |
Cost of remedy for settlements of claims | $ 20,000,000 |  |
Loss Contingency, Pending Claims, Number | claim | 2 |  |
Environmental remediation expense | $ 24,000 |  |
Key West Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Period Of Regulatory Inactivity | 17 years |  |
Environmental Exit Costs, Anticipated Cost | $ 50,000 |  |
Aspire Energy [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Number Of Environmental Sites | site | 8 |  |
Cost of remedy for settlements of claims | $ 1,400,000 |  |
Minimum Environmental Remediation Expenditures | 431,250 |  |
Business Combination, Indemnification Assets, Range of Outcomes, Value, High | 1,700,000 |  |
FPU [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | 10,000,000 |  |
Approval of recovery of environmental costs | 14,000,000 |  |
Environmental costs recovered | 10,200,000 |  |
FPU [Member] | Sanford Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Estimated costs of remediation range, maximum | $ 650,000 |  |
Environmental remediation expense percent | 5.00% |  |
FPU [Member] | Manufactured Gas Plant [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Regulatory Assets | $ 3,800,000 |  |
Chesapeake [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | 353,000 |  |
Regulatory Assets | 58,000 |  |
Maximum [Member] | Key West Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Exit Costs, Anticipated Cost | 8,000 |  |
Maximum [Member] | Pensacola Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Exit Costs, Anticipated Cost | $ 5,000 |  |

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