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Retirement Plans and Other Postretirement Benefits - Components of Net Periodic Pension Benefit Expense (Income) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined benefit plans:      
Service cost $ 7,261 $ 6,556 $ 6,879
Interest cost 22,611 26,979 25,678
Expected return on plan assets (54,629) (52,402) (59,325)
Settlement 0 739 0
Amortization of:      
Net actuarial loss 15,479 15,685 12,092
Prior service costs 486 484 (49)
Transition asset 1 1 1
Total net periodic benefit income (8,791) (1,958) (14,724)
Other plans:      
Defined contribution plans 30,829 32,508 28,829
Foreign plans and other 7,902 9,406 6,185
Total other plans 38,731 41,914 35,014
Total net pension expense $ 29,940 $ 39,956 $ 20,290