Employee Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Rabbi Trust Investments Assets	$ 10,800		$ 10,600
Florida Public Utilities Company Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	633	$ 449
Expected return on plan assets	(668)	(857)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	110	124
Total periodic cost	75	(284)
Defined Benefit Plan Amounts Recognized Gain (Loss)	110
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	21	24
Defined Benefit Plan Amounts Recognized From Regulatory Asset	89	100
Chesapeake Pension SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Amounts Recognized Gain (Loss)	124	$ 124
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, Expected Future Employer Contributions, Remainder of Fiscal Year	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