Employee Benefit Plans - Schedule of Funded Status of Benefit Obligation and Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in benefit obligation:
Interest cost	$ 50	$ 48	$ 63
Assumptions:
Deferred Pension Settlement Expense	600
Chesapeake Pension Plan
Change in benefit obligation:
Benefit obligation - beginning of year	0	6,146
Interest cost	0	141	176
Actuarial loss	0	(371)
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	0	(5,884)
Benefits paid	0	(32)
Benefit obligation - end of year	0	0	6,146
Change in plan assets:
Balance, beginning of year	0	4,609
Actual return on plan assets	0	(237)
Employer contributions	0	1,544
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	(5,884)
Benefits paid	0	(32)
Balance, end of year	0	0	$ 4,609
Reconciliation:
Accrued pension cost	$ 0	$ 0
Assumptions:
Discount rate	0.00%	2.50%
Expected return on plan assets	0.00%	3.50%	3.50%
FPU Pension Plan
Change in benefit obligation:
Benefit obligation - beginning of year	$ 67,030	$ 70,366
Interest cost	1,781	1,714	$ 2,085
Actuarial loss	(15,713)	(1,953)
Benefits paid	(3,157)	(3,097)
Benefit obligation - end of year	49,941	67,030	70,366
Change in plan assets:
Balance, beginning of year	58,712	55,966
Actual return on plan assets	(9,552)	4,246
Employer contributions	200	1,597
Benefits paid	(3,157)	(3,097)
Balance, end of year	46,203	58,712	$ 55,966
Reconciliation:
Accrued pension cost	$ (3,738)	$ (8,318)
Assumptions:
Discount rate	5.25%	2.75%
Expected return on plan assets	6.00%	6.00%	6.00%
Chesapeake SERP
Change in benefit obligation:
Benefit obligation - beginning of year	$ 2,096	$ 2,212
Interest cost	50	48
Actuarial loss	(335)	(12)
Benefits paid	(152)	(152)
Benefit obligation - end of year	1,659	2,096	$ 2,212
Change in plan assets:
Employer contributions	152	152
Benefits paid	(152)	(152)
Reconciliation:
Accrued pension cost	$ (1,659)	$ (2,096)
Assumptions:
Discount rate	5.00%	2.50%
Chesapeake Postretirement Plan
Reconciliation:
Funded status	$ (600)	$ (900)
FPU Medical Plan
Reconciliation:
Funded status	$ (700)	$ (1,000)