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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Document Period End Date |  |  | Jun. 30, 2015 |  |
Expected pension and postretirement benefit costs |  |  | $ 1,200 |  |
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 | $ 17 | $ 16 | 33 | $ 33 |
Contribution to pension plan | 24 |  | 116 |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year |  |  | 207 |  |
Chesapeake Postretirement Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | 9 | 10 | 18 | 20 |
Contribution to pension plan | 13 |  | 28 |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year |  |  | 79 |  |
Chesapeake Pension SERP [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | 50 | 40 | 101 | 79 |
Contribution to pension plan | 38 |  | 71 |  |
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 |  |  | (381) |  |
Chesapeake Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | 58 | 12 | 115 | 23 |
Contribution to pension plan | 115 |  | 219 |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year |  |  | 475 |  |
Florida Public Utilities Company Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unamortized balance of regulatory asset | 3,200 |  | 3,200 |  | $ 3,600
Defined Benefit Plan, Net Periodic Benefit Cost | (37) | $ (125) | (76) | $ (251) |
Contribution to pension plan | $ 381 |  | 723 |  |
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 end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + 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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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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