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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Expected pension and postretirement benefit costs | $ 900 |
Expected amortization of pre merger regulatory asset | 769 |
Florida Public Utilities Company Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unamortized balance of regulatory asset | 1,100 | $ 1,300
Contribution to pension plan | 309 |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 1,500 |
Chesapeake Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution to pension plan | 72 |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 359 |
Chesapeake Pension SERP [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution to pension plan | 38 |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 151 |
Chesapeake Postretirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution to pension plan | 12 |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 97 |
Florida Public Utilities Company Medical Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution to pension plan | 11 |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | $ 88 |

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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&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 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: 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=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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