Employee Benefit Plans - Additional Information (Detail) $ in Thousands		12 Months Ended
		Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Income tax benefits		$ 1,100
Total unrecognized cost		18,660
Expected Amortization Of Pre Merger Regulatory Asset		$ 0
Required period of service for eligibility		3 months
Percentage of eligible participants contribution to the plan		100.00%
Employer matching contribution vested, percentage		100.00%
Deferred Compensation Arrangement with Individual, Requisite Service Period		2 years
Deferred Pension Settlement Expense		$ 600		$ 700
Defined Benefit Plan, Benefit Obligation			2
Employee contribution age		55 years
Deferral rate		80.00%
Deferred Compensation Employer Matching Contribution Rate		6.00%
Number Of Years to Collect Benefits		20 years
Deferral rate increase, minimum		1.00%
Employer contributions to pension plan		$ 5,900	$ 5,900	5,700
Shares reserved to fund future contributions | shares		798,586
Investments, Fair Value Disclosure		$ 12,095	10,776
Deferred compensation obligation		$ 7,240	5,679
Minimum
Defined Benefit Plan Disclosure [Line Items]
Maximum percentage of eligible compensation		3.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Maximum percentage of eligible compensation		6.00%			10.00%
Number Of Years to Collect Benefits		15 years
Chesapeake Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Unfunded accumulated benefit obligation		$ 0	(1,537)
FPU Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total unrecognized cost		17,737
Unfunded accumulated benefit obligation		(8,318)	(14,400)
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		300
Expected contribution	[1]	3,451
Chesapeake SERP
Defined Benefit Plan Disclosure [Line Items]
Total unrecognized cost		659
Unfunded accumulated benefit obligation		(2,096)	(2,212)
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		200
Expected contribution	[2]	$ 151
Medical
Defined Benefit Plan Disclosure [Line Items]
Health care inflation rate		5.00%
Chesapeake Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Total unrecognized cost		$ 378
Unfunded accumulated benefit obligation		$ (934)	(1,033)
Expected Amortization Of Pre Merger Regulatory Asset			0	$ 0
Health care inflation rate		6.00%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 100
Expected contribution	[2]	73
FPU Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Total unrecognized cost		114
Unfunded accumulated benefit obligation		$ (1,004)	(1,009)
Health care inflation rate		5.00%
Expected contribution	[2]	$ 71
Rabbi Trust Associated With Deferred Compensation [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments, Fair Value Disclosure		$ 12,069	10,755
FPU Medical Plan and Chesapeake OPRB [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Plans		2
Rabbi Trust Associated With Deferred Compensation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation obligation		$ 12,100	10,800
Deferred Compensation Equity		$ 7,200	$ 5,700

[1] The pension plan is funded; therefore, benefit payments are expected to be paid out of the plan assets.

[2] Benefit payments are expected to be paid out of our general funds.