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Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure      
Net actuarial loss (gain) $ 10,284 $ 8,176 $ (3,316)
UNITED STATES      
Defined Benefit Plan Disclosure      
Service cost 1,773 1,608 2,196
Interest cost 5,770 7,189 8,940
Expected return on plan assets (4,840) (6,042) (9,049)
Amortization of prior service cost     58
Net actuarial loss (gain) 6,463 2,973 (4,429)
Settlement loss 451   345
Total net periodic pension cost 9,617 5,728 (1,939)
Prior service cost     (58)
Total recognized in other comprehensive income     (58)
Total recognized in net periodic pension cost (income) and other comprehensive income 9,617 5,728 (1,997)
Foreign Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure      
Service cost 907 751 786
Interest cost 516 691 687
Expected return on plan assets (65) (29) (19)
Net actuarial loss (gain) 2,949 4,485 743
Settlement loss 0    
Total net periodic pension cost 4,307 5,898 2,197
Prior service cost 0    
Total recognized in other comprehensive income 0    
Total recognized in net periodic pension cost (income) and other comprehensive income 4,307 5,898 2,197
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure      
Service cost 57 41 39
Interest cost 240 347 196
Amortization of prior service cost (9) (191) (373)
Net actuarial loss (gain) 421 717 25
Special termination benefits 0   3,708
Total net periodic pension cost 709 914 3,595
Prior service cost 9 191 373
Total recognized in other comprehensive income 9 191 373
Total recognized in net periodic pension cost (income) and other comprehensive income $ 718 $ 1,105 $ 3,968