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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of prior service cost |  | $ (19) | $ (19)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 143 | 228
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 124 | 209
Recognized from accumulated other comprehensive loss | [1] | 24 | 85
Recognized from regulatory asset |  | 100 | 124
Defined Benefit Plan Actuarial Gain Loss, Net Settlement |  |  | 209
Florida Public Utilities Company Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | 300 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 124 | 155
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 124 | 155
Recognized from accumulated other comprehensive loss | [1] | 24 | 29
Recognized from regulatory asset |  | 100 | 126
Chesapeake Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 0 | 60
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 0 | 60
Recognized from accumulated other comprehensive loss | [1] | 0 | 60
Chesapeake Pension SERP [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | 200 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 7 | 7
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 7 | 7
Recognized from accumulated other comprehensive loss | [1] | 7 | 7
Defined Benefit Plan Actuarial Gain Loss, Net Settlement |  |  | 7
Chesapeake Postretirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution to pension plan |  | 100 |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | 100 |
Amortization of prior service cost |  | (19) | (19)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 12 | 8
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | (7) | (11)
Recognized from accumulated other comprehensive loss | [1] | (7) | (11)
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 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  | (2)
Defined Benefit Plan Amounts Recognized Gain (Loss) |  |  | (2)
Recognized from regulatory asset |  |  | $ (2)
[1] | See Note 9, Stockholders' Equity.

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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