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Environmental Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 site | Dec. 31, 2011 | Dec. 31, 2010
Environmental Commitments And Contingencies [Line Items] |  |  |
Company's exposure in number of former Manufactured Gas Plant Sites | 6 |  |
Environmental liabilities | $ 9,114,000 | $ 9,492,000 |
Amount paid for funding requirements | 607,000 | 645,000 | 290,000
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 |  |
Environmental Remediation Expense | 24,000 |  |
Costs to resolve liability | 650,000 |  |
Key West Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Costs to resolve liability | 50,000 |  |
Period of regulatory inactivity | 17 years |  |
Key West Florida [Member] | Maximum [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Costs to resolve liability | 8,000 |  |
Pensacola Florida [Member] | Maximum [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Costs to resolve liability | 5,000 |  |
Salisbury Maryland [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Monitoring well remaining maximum cost | 5,000 |  |
Winter Haven Florida [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental Remediation Expense | 443,000 |  |
Additional remediation costs | 100,000 |  |
Corrective measures cost | 1,000,000 |  |
Winter Haven Florida [Member] | Maximum [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Remedial action time period | 3 years |  |
Winter Haven Florida [Member] | Minimum [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Remedial action time period | 2 years |  |
FPU [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | 10,500,000 |  |
Approval of recovery of environmental costs | 14,000,000 |  |
Environmental costs recovered | 8,700,000 |  |
FPU [Member] | Manufactured Gas Plant [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Regulatory assets for future recovery of environmental costs | 5,300,000 |  |
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% |  |
Amount paid for funding requirements | 650,000 |  |
Chesapeake [Member] |  |  |
Environmental Commitments And Contingencies [Line Items] |  |  |
Environmental liabilities | 170,000 |  |
Regulatory assets for future recovery of environmental costs | $ 612,000 |  |

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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://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=6952336&loc=d3e14326-108349 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 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161, 163 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 Reference 6: 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 + Details
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