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Pension Plans and Postretirement Benefits - Obligations and Funded Status (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in benefit obligation:            
Service cost       $ 12,400 $ 11,300 $ 9,700
Settlements $ (38,300)          
Actuarial loss (gain)   $ (39,600) $ 6,400      
Change in plan assets:            
Balance at beginning of period       1,333,309    
Company contributions       6,164    
Balance at end of period 1,310,311 1,310,311 1,333,309 1,310,311 1,333,309  
Amounts recognized in the balance sheet consist of:            
Accumulated postretirement benefit obligation (24,333) (24,333) (25,689) (24,333) (25,689)  
Pension liability (59,388) (59,388) (144,859) (59,388) (144,859)  
Pension Plan            
Change in benefit obligation:            
Benefit obligation at beginning of period       1,414,055 1,308,798  
Service cost       11,667 10,650 9,123
Interest cost       27,170 37,199 46,307
Plan participants' contributions       199 180  
Amendments       2,314 2,333  
Settlements       (38,330) (7,041)  
Actuarial loss (gain)       (45,476) 120,126  
Foreign currency exchange rate changes       1,669 3,513  
Benefits paid       (65,002) (61,703)  
Benefit obligation at end of period 1,308,266 1,308,266 1,414,055 1,308,266 1,414,055 1,308,798
Change in plan assets:            
Balance at beginning of period       1,281,232 1,150,495  
Actual return on plan assets       72,030 190,862  
Plan participants' contributions       199 180  
Company contributions         5,131  
Settlements       (39,439) (7,041)  
Foreign currency exchange rate changes       1,615 3,308  
Benefits paid       (65,002) (61,703)  
Balance at end of period 1,256,799 1,256,799 1,281,232 1,256,799 1,281,232 1,150,495
Funded status (51,467) (51,467) (132,823) (51,467) (132,823)  
Amounts recognized in the balance sheet consist of:            
Prepaid pension 10,573 10,573 14,588 10,573 14,588  
Accrued employee benefits (3,125) (3,125) (3,082) (3,125) (3,082)  
Accumulated postretirement benefit obligation 0 0 0 0 0  
Pension liability (58,915) (58,915) (144,329) (58,915) (144,329)  
Accrued benefit liability, net (51,467) (51,467) (132,823) (51,467) (132,823)  
Amount recognized in accumulated comprehensive income (before taxes):            
Prior service cost (credit) 20,536 20,536 21,319 20,536 21,319  
Plans with accumulated benefit obligation in excess of plan assets:            
Projected benefit obligation 1,172,881 1,172,881 1,264,764 1,172,881 1,264,764  
Accumulated benefit obligation 1,166,855 1,166,855 1,255,899 1,166,855 1,255,899  
Fair value of plan assets 1,110,841 1,110,841 1,117,353 1,110,841 1,117,353  
Plans with plan assets in excess of accumulated benefit obligation:            
Projected benefit obligation 135,385 135,385 149,291 135,385 149,291  
Accumulated benefit obligation 135,375 135,375 149,270 135,375 149,270  
Fair value of plan assets 145,958 145,958 163,879 145,958 163,879  
Other Benefits            
Change in benefit obligation:            
Benefit obligation at beginning of period       61,086 58,881  
Service cost       760 642 545
Interest cost       1,197 1,612 2,254
Plan participants' contributions       488 562  
Amendments       3,402 0  
Settlements       0 0  
Actuarial loss (gain)       (4,944) 2,219  
Foreign currency exchange rate changes       197 331  
Benefits paid       (2,885) (3,161)  
Benefit obligation at end of period 59,301 59,301 61,086 59,301 61,086 58,881
Change in plan assets:            
Balance at beginning of period       52,077 48,321  
Actual return on plan assets       2,898 5,293  
Plan participants' contributions       488 562  
Company contributions       1,008 992  
Settlements       0 0  
Foreign currency exchange rate changes       0 0  
Benefits paid       (2,959) (3,091)  
Balance at end of period 53,512 53,512 52,077 53,512 52,077 $ 48,321
Funded status (5,789) (5,789) (9,009) (5,789) (9,009)  
Amounts recognized in the balance sheet consist of:            
Prepaid pension 20,122 20,122 18,069 20,122 18,069  
Accrued employee benefits (1,578) (1,578) (1,389) (1,578) (1,389)  
Accumulated postretirement benefit obligation (24,333) (24,333) (25,689) (24,333) (25,689)  
Pension liability 0 0 0 0 0  
Accrued benefit liability, net (5,789) (5,789) (9,009) (5,789) (9,009)  
Amount recognized in accumulated comprehensive income (before taxes):            
Prior service cost (credit) 2,520 2,520 (1,059) 2,520 (1,059)  
Plans with accumulated benefit obligation in excess of plan assets:            
Accumulated benefit obligation 23,503 23,503 24,593 23,503 24,593  
Fair value of plan assets 0 0 0 0 0  
Plans with plan assets in excess of accumulated benefit obligation:            
Accumulated benefit obligation 35,798 35,798 36,493 35,798 36,493  
Fair value of plan assets $ 53,512 $ 53,512 $ 52,077 $ 53,512 $ 52,077