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Retirement Plans - Assumptions Used in Accounting for Plans (Detail)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Discount rate used to calculate benefit obligation 5.01% 5.23% 2.74%
Discount rate used to calculate net periodic pension cost 5.23% 2.74% 2.40%
Executive Compensation      
Defined Benefit Plan Disclosure [Line Items]      
Average annual increase in compensation 0.00% 0.00% 3.25%
Director Compensation      
Defined Benefit Plan Disclosure [Line Items]      
Average annual increase in compensation 0.00% 0.00% 0.00%