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Employee Benefit Plans - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($)
Florida Public Utilities Company Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution to pension plan | $ 500 | $ 2,600
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 3,200 | 3,200
Chesapeake Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution to pension plan | 100 | 300
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 300 | 300
Chesapeake Pension SERP [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 200 | 200
Payment for Pension and Other Postretirement Benefits |  | 100
Chesapeake Postretirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 100 | 100
Florida Public Utilities Company Medical Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | $ 100 | $ 100

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