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Retirement Plans - Information Pertaining to Activity in Supplemental Retirement Plans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in benefit obligation:      
Benefit obligation at beginning of year $ (38,645) $ (40,341)  
Acquisition of obligations 0 0  
Service cost (114) (138) $ (1,624)
Interest cost (1,830) (2,016) (1,731)
Actuarial (loss)/gain 3,017 81  
Plan amendments 0 0  
Benefits paid 2,709 3,769  
Benefit obligation at end of year (34,863) (38,645) $ (40,341)
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 (34,863) (38,645)  
Unrecognized net obligation existing at January 1, 1986 0 0  
Unrecognized net actuarial (loss)/gain (16,085) (13,527)  
Unrecognized prior service cost 0 0  
Accumulated other comprehensive loss 16,085 13,527  
Accrued benefit cost (34,863) (38,645)  
Accumulated benefit obligation $ (34,863) $ (38,645)