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Environmental Commitments and Contingencies - Additional Information (Detail) | 9 Months Ended |
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Sep. 30, 2025 USD ($) site | Dec. 31, 2024 USD ($)
Environmental Commitments And Contingencies [Line Items] |  |
Company's exposure in number of former Manufactured Gas Plant Sites | site | 7 |
Environmental liabilities | $ 2,800,000 | $ 2,200,000
West Palm Beach Florida [Member] | Minimum [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Estimated costs of remediation range, minimum | 2,500,000 |
West Palm Beach Florida [Member] | Maximum [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Estimated costs of remediation range, minimum | 5,200,000 |
Seaford [Member] | Minimum [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Estimated costs of remediation range, minimum | 300,000 |
Seaford [Member] | Maximum [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Estimated costs of remediation range, minimum | 800,000 |
Manufactured Gas Plant [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Regulatory Assets for future recovery of environmental costs | 300,000 | 300,000
FPU [Member] |  |
Environmental Commitments And Contingencies [Line Items] |  |
Environmental liabilities | $ 3,100,000 | $ 3,200,000

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481931/410-30-50-7 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481931/410-30-50-10 + 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/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481899/410-30-55-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-2 + Details
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