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Retirement Benefit Plans - Summary of Information on Plans' Assets, Projected Benefit Obligations (PBO), and Funded Status (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Plan Assets at Beginning of Year $ 137,893 $ 126,098  
Actual Return on Plan Assets 15,146 16,822  
Employer Contributions 3,758 3,850 $ 3,800
Participant Contributions (0)    
Benefits Paid   (8,877)  
Plan Assets at End of Year 148,974 137,893 126,098
PBO at Beginning of Year 154,567 146,953  
Service Cost 1,990 2,091 3,165
Interest Cost 7,546 7,480 5,486
Benefits Paid (7,823) (8,877) (9,724)
Actuarial (Gain) or Loss (7,724) 6,920  
PBO at End of Year 148,556 154,567 146,953
Funded Status: Assets vs PBO 418 (16,674)  
Retirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Plan Assets at Beginning of Year 51,892 44,770  
Actual Return on Plan Assets 6,224 6,865  
Employer Contributions 2,552 2,790 12,153
Participant Contributions 260 234  
Benefits Paid (2,526) (2,767)  
Plan Assets at End of Year 58,402 51,892 44,770
PBO at Beginning of Year 66,691 56,510  
Service Cost 1,988 1,493 2,890
Interest Cost 3,269 2,899 3,194
Benefits Paid (2,526) (2,767) (3,503)
Actuarial (Gain) or Loss 2,525 8,322  
PBO at End of Year 72,207 66,691 56,510
Funded Status: Assets vs PBO (13,805) (14,799)  
Supplemental Employee Retirement Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Employer Contributions 679 665 637
Benefits Paid (679) (665)  
PBO at Beginning of Year 14,854 14,810  
Service Cost 216 250 273
Interest Cost 723 754 472
Benefits Paid (679) (665) (637)
Actuarial (Gain) or Loss (2,367) (295)  
PBO at End of Year 12,747 14,854 $ 14,810
Funded Status: Assets vs PBO $ (12,747) $ (14,854)