Employee Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Rabbi Trust Investments Assets	$ 11,100		$ 11,100		$ 10,600
Florida Public Utilities Company Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	633	$ 449	1,899	$ 1,347
Expected return on plan assets	(668)	(857)	(2,004)	(2,571)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	110	124	330	372
Total periodic cost	75	(284)	225	(852)
Defined Benefit Plan Amounts Recognized Gain (Loss)	110		330
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	21	24	63	72
Defined Benefit Plan Amounts Recognized From Regulatory Asset	$ 89	100	$ 267	300
Chesapeake Pension SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Amounts Recognized Gain (Loss)		$ 124		$ 372