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Components of Retirement Plan Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 792 $ 868 $ 2,374 $ 2,604
Interest Cost 1,372 1,250 4,114 3,752
Expected Return on Plan Assets (2,722) (2,422) (8,162) (7,268)
Prior Service Cost Amortization 89 76 267 226
Actuarial Loss Amortization 1,376 2,021 4,130 6,065
Sub-total 907 1,793 2,723 5,379
Amounts Capitalized and Deferred (345) (944) (810) (2,544)
Net Periodic Benefit Cost Recognized 562 849 1,913 2,835
Other Postretirement Benefit Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 723 759 2,167 2,275
Interest Cost 798 685 2,396 2,055
Expected Return on Plan Assets (853) (627) (2,561) (1,881)
Prior Service Cost Amortization 273 302 819 906
Actuarial Loss Amortization 255 260 765 784
Sub-total 1,196 1,379 3,586 4,139
Amounts Capitalized and Deferred (655) (904) (1,788) (2,358)
Net Periodic Benefit Cost Recognized 541 475 1,798 1,781
Supplemental Employee Retirement Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 69 89 205 266
Interest Cost 118 114 354 343
Prior Service Cost Amortization 14 14 42 42
Actuarial Loss Amortization 196 372 595 1,117
Sub-total 397 589 1,196 1,768
Amounts Capitalized and Deferred (117) (178) (354) (534)
Net Periodic Benefit Cost Recognized $ 280 $ 411 $ 842 $ 1,234