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Employee Benefit Plans (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 Actuarial Gain Loss, Net Settlement |  |  | 209
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 143 | 228
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 124 | 209
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 24 | 85
Defined Benefit Plan Amounts Recognized From Regulatory Asset |  | 100 | 124
Deferred Pension Settlement Expense |  | 600 |
Chesapeake Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Interest cost |  | 0 | 34
Expected return on plan assets |  | 0 | (40)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 0 | 60
Total periodic cost |  | 0 | 54
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 0 | 60
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 0 | 60
Florida Public Utilities Company Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Interest cost |  | 449 | 429
Expected return on plan assets |  | (857) | (830)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 124 | 155
Total periodic cost |  | (284) | (246)
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 124 | 155
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 24 | 29
Defined Benefit Plan Amounts Recognized From Regulatory Asset |  | 100 | 126
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | 300 |
Chesapeake Pension SERP [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Interest cost |  | 13 | 12
Defined Benefit Plan Actuarial Gain Loss, Net Settlement |  |  | 7
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 7 | 7
Total periodic cost |  | 20 | 19
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 7 | 7
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 7 | 7
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | 200 |
Chesapeake Postretirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | 100 |
Interest cost |  | 6 | 6
Amortization of prior service cost |  | (19) | (19)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 12 | 8
Total periodic cost |  | (1) | (5)
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | (7) | (11)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | (7) | (11)
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | 100 |
Florida Public Utilities Company Medical Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Interest cost |  | 6 | 6
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  | (2)
Total periodic cost |  | 6 | 4
Defined Benefit Plan Amounts Recognized Gain (Loss) |  |  | (2)
Defined Benefit Plan Amounts Recognized From Regulatory Asset |  |  | $ (2)
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  | $ 100 |
[1] | See Note 9, Stockholders' Equity.

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- Definition Defined Benefit Plan Amounts Recognized From Regulatory Asset + References No definition available. + Details
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- Definition Defined Benefit Plan Amounts Recognized Gain (Loss) + References No definition available. + Details
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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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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -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 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 5: 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 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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/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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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