Employee Benefit Plans - Additional Information (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]
Investments, at fair value	$ 11,084		$ 11,084		$ 10,576
Payment for Other Postretirement Benefits			1,000
Deferred compensation obligation	8,987		8,987		7,060
Rabbi Trust Investments Assets	11,100		11,100		$ 10,600
Florida Public Utilities Company Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	110	$ 124	330	$ 372
Defined Benefit Plan Amounts Recognized Gain (Loss)	110		330
Recognized from accumulated other comprehensive loss	21	24	63	72
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
Defined Benefit Plan, Plan Assets, Benefits Paid	$ 200		$ 500