Employee Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 400		$ 400
Rabbi Trust Investments Assets	11,700		11,700		$ 10,600
Florida Public Utilities Company Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	633	$ 449	1,266	$ 898
Expected return on plan assets	(668)	(857)	(1,336)	(1,714)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	110	124	220	248
Total periodic cost	75	(284)	150	(568)
Defined Benefit Plan Amounts Recognized Gain (Loss)	110		220
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	21	24	42	48
Defined Benefit Plan Amounts Recognized From Regulatory Asset	89	$ 100	$ 178	200
Chesapeake Pension SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Amounts Recognized Gain (Loss)	$ 124			$ 248