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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.