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Retirement Plans - Information Pertaining to Activity in Supplemental Retirement Plans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in benefit obligation:      
Benefit obligation at beginning of year $ (40,341) $ (43,834)  
Acquisition of obligations 0 (3,310)  
Service cost (138) (1,624) $ (1,103)
Interest cost (2,016) (1,731) (1,518)
Actuarial (loss)/gain 81 10,266  
Plan amendments 0 (2,141)  
Benefits paid 3,769 2,033  
Benefit obligation at end of year (38,645) (40,341) $ (43,834)
Change in plan assets:      
Fair value of plan assets at beginning of year 0    
Fair value of plan assets at end of year 0 0  
Funded status (38,645) (40,341)  
Unrecognized net obligation existing at January 1, 1986 0 0  
Unrecognized net actuarial (loss)/gain (13,527) (13,901)  
Unrecognized prior service cost 0 0  
Accumulated other comprehensive loss 13,527 13,901  
Accrued benefit cost (38,645) (40,341)  
Accumulated benefit obligation $ (38,645) $ (40,341)