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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected pension and postretirement benefit costs | $ 1,600 |  |
Expected amortization of pre merger regulatory asset | 769 |  |
Florida Public Utilities Company Medical Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | 14 | $ 17 |
Contribution to pension plan | 38 |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year | 149 |  |
Chesapeake Postretirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | 9 | 9 |
Contribution to pension plan | 21 |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year | 82 |  |
Chesapeake Pension SERP [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | 45 | 50 |
Contribution to pension plan | 38 |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year | 151 |  |
Consolidated [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | (802) |  |
Chesapeake Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | 78 | 57 |
Contribution to pension plan | 104 |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year | 508 |  |
Florida Public Utilities Company Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unamortized balance of regulatory asset | 2,700 |  | $ 2,800
Defined Benefit Plan, Net Periodic Benefit Cost | 57 | $ (37) |
Contribution to pension plan | 337 |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year | $ 1,600 |  |

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- Definition Expected pension and postretirement benefit costs. + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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