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Environmental Commitments and Contingencies - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) site | Dec. 31, 2017 USD ($)
Environmental Commitments And Contingencies [Line Items] |  |
Company's exposure in number of former Manufactured Gas Plant Sites | site | 7 |
Environmental liabilities | $ 8,215,000 | $ 8,263,000
West Palm Beach Florida [Member] | Minimum [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Estimated costs of remediation range, minimum | 4,500,000 |
West Palm Beach Florida [Member] | Maximum [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Estimated costs of remediation range, minimum | 15,400,000 |
Sanford Florida [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Environmental remediation expense | 10,000 |
Winter Haven Florida [Member] | Maximum [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Environmental remediation expense | 425,000 |
Seaford [Member] | Minimum [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Estimated costs of remediation range, minimum | 273,000 |
Seaford [Member] | Maximum [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Estimated costs of remediation range, minimum | 465,000 |
FPU [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Environmental liabilities | 9,600,000 |
Approval of recovery of environmental costs | 14,000,000 |
Environmental costs recovered | 11,100,000 |
FPU [Member] | Manufactured Gas Plant [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Regulatory Assets for future recovery of environmental costs | $ 2,900,000 |

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- Definition Maximum amount of environmental costs that can be recovered from insurance and customers. + References No definition available. + Details
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- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Amount of any recovery from third parties that is credited to environmental remediation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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- Definition Estimate of reasonably possible loss exposure in excess of amount accrued for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14394-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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