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Summary of Information on Plans' Assets, Projected Benefit Obligations (PBO), and Funded Status (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Plan Assets at Beginning of Year $ 152,006 $ 137,406  
Actual Return on Plan Assets (19,984) 16,989  
Employer Contributions 3,800 4,100 $ 4,665
Benefits Paid (9,724) (6,489)  
Plan Assets at End of Year 126,098 152,006 137,406
PBO at Beginning of Year 199,418 206,092  
Service Cost 3,165 3,472 3,322
Interest Cost 5,486 5,003 5,776
Plan Amendments   674  
Benefits Paid (9,724) (6,489) (6,038)
Actuarial (Gain) or Loss (51,392) (9,334)  
PBO at End of Year 146,953 199,418 206,092
Funded Status: Assets vs PBO (20,855) (47,412)  
Other Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Plan Assets at Beginning of Year 42,651 32,847  
Actual Return on Plan Assets (6,810) 3,586  
Employer Contributions 12,153 8,903 4,156
Participant Contributions 279 220  
Benefits Paid (3,503) (2,905)  
Plan Assets at End of Year 44,770 42,651 32,847
PBO at Beginning of Year 112,087 106,831  
Service Cost 2,890 3,034 2,698
Interest Cost 3,194 2,740 3,121
Benefits Paid (3,503) (2,905) (2,568)
Actuarial (Gain) or Loss (58,437) 2,167  
PBO at End of Year 56,510 112,087 106,831
Funded Status: Assets vs PBO (11,740) (69,436)  
Supplemental Employee Retirement Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Employer Contributions 637 637 654
Benefits Paid (637)    
PBO at Beginning of Year 17,714 20,225  
Service Cost 273 354 283
Interest Cost 472 458 549
Benefits Paid (637) (637) (654)
Actuarial (Gain) or Loss (3,012) (2,686)  
PBO at End of Year 14,810 17,714 $ 20,225
Funded Status: Assets vs PBO $ (14,810) $ (17,714)