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Pension Plans and Postretirement Benefits - Obligations and Funded Status (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in benefit obligation:          
Service cost     $ 7,900 $ 11,800 $ 12,400
Actuarial loss (gain) $ 30,800 $ 46,600      
Change in plan assets:          
Balance at beginning of period     921,307    
Company contributions     4,390    
Balance at end of period 926,395 921,307 926,395 921,307  
Amounts recognized in the balance sheet consist of:          
Accumulated postretirement benefit obligation (18,466) (18,157) (18,466) (18,157)  
Pension liability (82,786) (57,832) (82,786) (57,832)  
Pension Plan          
Change in benefit obligation:          
Benefit obligation at beginning of period     926,978 1,308,266  
Service cost     7,515 11,116 11,667
Interest cost     47,638 30,924 27,170
Plan participants' contributions     137 224  
Amendments     2,161 3,100  
Settlements     0 (48,777)  
Actuarial loss (gain)     30,568 (307,946)  
Foreign currency exchange rate changes     738 (6,564)  
Benefits paid     (61,366) (63,365)  
Benefit obligation at end of period 954,369 926,978 954,369 926,978 1,308,266
Change in plan assets:          
Balance at beginning of period     875,691 1,256,799  
Actual return on plan assets     59,354 (263,881)  
Plan participants' contributions     137 224  
Company contributions       14,172  
Settlements     0 (61,416)  
Foreign currency exchange rate changes     736 (6,842)  
Benefits paid     (61,366) (63,365)  
Balance at end of period 878,942 875,691 878,942 875,691 1,256,799
Funded status (75,427) (51,287) (75,427) (51,287)  
Amounts recognized in the balance sheet consist of:          
Prepaid postretirement benefit obligation 0 0 0 0  
Prepaid pension 10,146 9,542 10,146 9,542  
Accrued employee benefits (2,787) (2,997) (2,787) (2,997)  
Accumulated postretirement benefit obligation 0 0 0 0  
Pension liability (82,786) (57,832) (82,786) (57,832)  
Accrued benefit liability, net (75,427) (51,287) (75,427) (51,287)  
Amount recognized in accumulated comprehensive income (before taxes):          
Prior service cost (credit) 19,287 20,363 19,287 20,363  
Plans with accumulated benefit obligation in excess of plan assets:          
Projected benefit obligation 933,588 877,431 933,588 877,431  
Accumulated benefit obligation 906,593 873,185 906,593 873,185  
Fair value of plan assets 847,755 816,693 847,755 816,693  
Plans with plan assets in excess of accumulated benefit obligation:          
Projected benefit obligation 20,781 49,547 20,781 49,547  
Accumulated benefit obligation 20,781 49,547 20,781 49,547  
Fair value of plan assets 31,187 58,999 31,187 58,999  
Other Benefits          
Change in benefit obligation:          
Benefit obligation at beginning of period     43,050 59,301  
Service cost     338 650 760
Interest cost     2,139 1,387 1,197
Plan participants' contributions     218 346  
Amendments     0 261  
Settlements     0 0  
Actuarial loss (gain)     159 (14,747)  
Foreign currency exchange rate changes     292 (921)  
Benefits paid     (2,880) (3,227)  
Benefit obligation at end of period 43,316 43,050 43,316 43,050 59,301
Change in plan assets:          
Balance at beginning of period     45,616 53,512  
Actual return on plan assets     3,769 (6,003)  
Plan participants' contributions     218 346  
Company contributions     870 1,032  
Settlements     0 0  
Foreign currency exchange rate changes     0 0  
Benefits paid     (3,020) (3,271)  
Balance at end of period 47,453 45,616 47,453 45,616 $ 53,512
Funded status 4,137 2,566 4,137 2,566  
Amounts recognized in the balance sheet consist of:          
Prepaid postretirement benefit obligation 23,915 22,232 23,915 22,232  
Prepaid pension 0 0 0 0  
Accrued employee benefits (1,312) (1,509) (1,312) (1,509)  
Accumulated postretirement benefit obligation (18,466) (18,157) (18,466) (18,157)  
Pension liability 0 0 0 0  
Accrued benefit liability, net 4,137 2,566 4,137 2,566  
Amount recognized in accumulated comprehensive income (before taxes):          
Prior service cost (credit) 2,711 2,750 2,711 2,750  
Plans with accumulated benefit obligation in excess of plan assets:          
Accumulated benefit obligation 17,747 17,795 17,747 17,795  
Fair value of plan assets 0 0 0 0  
Plans with plan assets in excess of accumulated benefit obligation:          
Accumulated benefit obligation 25,569 25,255 25,569 25,255  
Fair value of plan assets $ 47,453 $ 45,616 $ 47,453 $ 45,616