Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost		$ (19)		$ (19)		$ (38)		$ (38)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		143		230		286		458
Defined Benefit Plan Amounts Recognized Gain (Loss)		124		211		248		420
Recognized from accumulated other comprehensive loss		24	[1]	87	[1]	48	[2]	171	[2]
Recognized from regulatory asset		100		124		200		249
Defined Benefit Plan Actuarial Gain Loss, Net Settlement				211				420
Florida Public Utilities Company Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plan						100
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		300				300
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		124		155		248		310
Defined Benefit Plan Amounts Recognized Gain (Loss)		124		155		248		310
Recognized from accumulated other comprehensive loss		24	[1]	29	[1]	48	[2]	58	[2]
Recognized from regulatory asset		100		126		200		252
Chesapeake Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		0		60		0		120
Defined Benefit Plan Amounts Recognized Gain (Loss)		0		60		0		120
Recognized from accumulated other comprehensive loss		0	[1]	60	[1]	0	[2]	120	[2]
Chesapeake Pension SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plan						100
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		200				200
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		7		7		14		14
Defined Benefit Plan Amounts Recognized Gain (Loss)		7		7		14		14
Recognized from accumulated other comprehensive loss		7	[1]	7	[1]	14	[2]	14	[2]
Defined Benefit Plan Actuarial Gain Loss, Net Settlement				7				14
Chesapeake Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plan						100
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		100				100
Amortization of prior service cost		(19)		(19)		(38)		(38)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		12		10		24		18
Defined Benefit Plan Amounts Recognized Gain (Loss)		(7)		(9)		(14)		(20)
Recognized from accumulated other comprehensive loss		(7)	[1]	(9)	[1]	(14)	[2]	(20)	[2]
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				$ 100
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)				(2)				(4)
Defined Benefit Plan Amounts Recognized Gain (Loss)				(2)				(4)
Recognized from accumulated other comprehensive loss	[2]							(1)
Recognized from regulatory asset				$ (2)				$ (3)

[1] .

[2] 1) See Note 9, Stockholders' Equity.