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Components of Retirement Plan Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 791 $ 868
Interest Cost 1,371 1,251
Expected Return on Plan Assets (2,720) (2,423)
Prior Service Cost Amortization 89 75
Actuarial Loss Amortization 1,377 2,022
Sub-total 908 1,793
Amounts Capitalized and Deferred (156) (713)
Net Periodic Benefit Cost Recognized 752 1,080
Other Postretirement Benefit Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 722 758
Interest Cost 799 685
Expected Return on Plan Assets (854) (627)
Prior Service Cost Amortization 273 302
Actuarial Loss Amortization 255 262
Sub-total 1,195 1,380
Amounts Capitalized and Deferred (511) (662)
Net Periodic Benefit Cost Recognized 684 718
Supplemental Employee Retirement Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 68 89
Interest Cost 118 114
Prior Service Cost Amortization 14 14
Actuarial Loss Amortization 199 372
Sub-total 399 589
Amounts Capitalized and Deferred (118) (178)
Net Periodic Benefit Cost Recognized $ 281 $ 411