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Employee Benefits - Changes in Postretirement Benefit Obligation and Plan Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Postretirement Benefit Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 64,174 $ 59,625  
Service cost for benefits earned(1) 603 568 $ 755
Interest cost on projected benefit obligation(2) 1,781 2,265 2,460
Actuarial (gain) loss 4,944 3,941  
Plan amendments 0 0  
Adjustments for expense/tax contained in service cost 0 0  
Plan participants’ contributions 374 437  
Benefits paid (3,241) (2,662)  
Curtailments / settlements 0 0  
Translation adjustments 0 0  
Other 0 0  
Benefit obligation at end of year 68,635 64,174 59,625
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Employer contributions 3,200    
U.S Plans [Member] | Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 620,654 562,043  
Service cost for benefits earned(1) 1,283 1,378 1,971
Interest cost on projected benefit obligation(2) 17,261 21,954 19,393
Actuarial (gain) loss 76,749 68,839  
Plan amendments 102 0  
Adjustments for expense/tax contained in service cost 0 0  
Plan participants’ contributions 0 0  
Benefits paid (34,402) (33,560)  
Curtailments / settlements 0 0  
Translation adjustments 0 0  
Other (24) 0  
Benefit obligation at end of year 681,623 620,654 562,043
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 602,408 532,381  
Actual return on plan assets 106,255 99,904  
Employer contributions 3,710 3,683  
Plan participants’ contributions 0 0  
Benefits paid (34,402) (33,560)  
Settlements 0 0  
Translation adjustments 0 0  
Other 58 0  
Fair value of plan assets at end of year 678,029 602,408 532,381
Funded status at end of year (3,594) (18,246)  
Non-U.S. Plans [Member] | Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 1,099,084 957,935  
Service cost for benefits earned(1) 23,952 19,319 18,738
Interest cost on projected benefit obligation(2) 12,767 17,775 17,704
Actuarial (gain) loss 108,945 119,891  
Plan amendments 367 0  
Adjustments for expense/tax contained in service cost (1,293) (1,333)  
Plan participants’ contributions 2,848 2,803  
Benefits paid (27,822) (28,977)  
Curtailments / settlements (11,125) (3,455)  
Translation adjustments 85,774 13,935  
Other 747 1,191  
Benefit obligation at end of year 1,294,244 1,099,084 957,935
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 1,005,283 896,782  
Actual return on plan assets 83,625 100,163  
Employer contributions 21,123 20,031  
Plan participants’ contributions 2,848 2,803  
Benefits paid (27,822) (28,977)  
Settlements (11,125) (3,455)  
Translation adjustments 70,282 16,982  
Other 748 954  
Fair value of plan assets at end of year 1,144,962 1,005,283 $ 896,782
Funded status at end of year $ (149,282) $ (93,801)