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Retirement Plans and Other Postretirement Benefits - Net Projected Benefit Obligation and Fair Value of Plan Assets for Funded and Unfunded Defined Benefit Plans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in projected benefit obligation:      
Net projected benefit obligation at the beginning of the year $ 822,297    
Service cost 7,261 $ 6,556 $ 6,879
Interest cost 22,611 26,979 25,678
Net projected benefit obligation at the end of the year 883,940 822,297  
Change in plan assets:      
Fair value of plan assets at the beginning of the year 845,979    
Fair value of plan assets at the end of the year 913,034 845,979  
U.S. Defined Benefit Pension Plans | Pension Plan      
Change in projected benefit obligation:      
Net projected benefit obligation at the beginning of the year 510,514 471,506  
Service cost 3,015 3,248  
Interest cost 17,235 20,287  
Actuarial losses (gains) 32,963 46,269  
Gross benefits paid (31,370) (30,796)  
Net projected benefit obligation at the end of the year 532,357 510,514 471,506
Change in plan assets:      
Fair value of plan assets at the beginning of the year 621,632 552,187  
Actual return on plan assets 71,281 99,573  
Employer contributions 755 668  
Gross benefits paid (31,370) (30,796)  
Fair value of plan assets at the end of the year 662,298 621,632 552,187
Foreign Defined Benefit Pension Plans      
Change in plan assets:      
Fair value of plan assets at the beginning of the year 224,347    
Fair value of plan assets at the end of the year 250,735 224,347  
Foreign Defined Benefit Pension Plans | Pension Plan      
Change in projected benefit obligation:      
Net projected benefit obligation at the beginning of the year 311,783 268,763  
Service cost 4,246 3,307  
Interest cost 5,376 6,692  
Foreign currency translation adjustments 13,955 9,042  
Employee contributions 92 110  
Actuarial losses (gains) 27,055 35,021  
Expenses paid from assets (838) (747)  
Gross benefits paid (10,615) (8,421)  
Settlements 0 (1,984)  
Plan amendments 530 0  
Net projected benefit obligation at the end of the year 351,584 311,783 268,763
Change in plan assets:      
Fair value of plan assets at the beginning of the year 224,347 196,801  
Actual return on plan assets 20,966 25,391  
Employer contributions 8,772 4,941  
Employee contributions 92 110  
Foreign currency translation adjustments 8,011 8,256  
Expenses paid from assets (838) (747)  
Settlements 0 (1,984)  
Gross benefits paid (10,615) (8,421)  
Fair value of plan assets at the end of the year $ 250,735 $ 224,347 $ 196,801