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Components of Retirement Plan Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 791 $ 868 $ 1,582 $ 1,736
Interest Cost 1,371 1,251 2,742 2,502
Expected Return on Plan Assets (2,720) (2,423) (5,440) (4,846)
Prior Service Cost Amortization 89 75 178 150
Actuarial Loss Amortization 1,377 2,022 2,754 4,044
Sub-total 908 1,793 1,816 3,586
Amounts Capitalized and Deferred (309) (887) (464) (1,600)
Net Periodic Benefit Cost Recognized 599 906 1,352 1,986
Other Postretirement Benefit Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 722 758 1,444 1,516
Interest Cost 799 685 1,598 1,370
Expected Return on Plan Assets (854) (627) (1,708) (1,254)
Prior Service Cost Amortization 273 302 546 604
Actuarial Loss Amortization 255 262 510 524
Sub-total 1,195 1,380 2,390 2,760
Amounts Capitalized and Deferred (622) (791) (1,133) (1,454)
Net Periodic Benefit Cost Recognized 573 589 1,257 1,306
Supplemental Employee Retirement Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 68 88 136 177
Interest Cost 118 115 236 229
Prior Service Cost Amortization 14 14 28 28
Actuarial Loss Amortization 199 373 399 745
Sub-total 399 590 799 1,179
Amounts Capitalized and Deferred (119) (178) (238) (356)
Net Periodic Benefit Cost Recognized $ 280 $ 412 $ 561 $ 823