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Environmental Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) site | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Environmental Commitments And Contingencies [Line Items] |  |  |
Company's exposure in number of former Manufactured Gas Plant Sites | site | 7 |  |
Environmental liabilities | $ 9,043 |  | $ 8,923
Amount paid for funding requirements | 73 | $ 79 |
Seaford [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | 273 |  |
Accrual for Environmental Loss Contingencies | 245 |  |
Regulatory Assets | 273 |  |
Estimated costs of remediation range, minimum | 273 |  |
Estimated costs of remediation range, maximum | 465 |  |
Winter Haven Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental remediation expense | 443 |  |
Additional remediation costs | 100 |  |
West Palm Beach Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Estimated costs of remediation range, minimum | 4,500 |  |
Estimated costs of remediation range, maximum | 15,400 |  |
Sanford Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Estimated costs of remediation range, maximum | 13,000 |  |
Cost of remedy for settlements of claims | 20,000 |  |
Environmental remediation expense | 24 |  |
FPU [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | 10,100 |  |
Approval of recovery of environmental costs | 14,000 |  |
Environmental costs recovered | 9,900 |  |
FPU [Member] | Sanford Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Estimated costs of remediation range, maximum | $ 650 |  |
Environmental remediation expense percent | 5.00% |  |
Amount paid for funding requirements | $ 650 |  |
FPU [Member] | Manufactured Gas Plant [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Regulatory Assets | 4,100 |  |
Chesapeake [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | 380 |  |
Regulatory Assets | $ 145 |  |

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