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Retirement and Pension Plans - Components of Net Periodic Pension Benefit Expense (Income) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined benefit plans:        
Service cost $ 2,030 $ 1,929 $ 4,051 $ 3,879
Interest cost 4,581 5,600 9,148 11,236
Expected return on plan assets (14,221) (13,558) (28,395) (27,208)
Amortization of net actuarial loss and other 4,379 3,931 8,732 7,907
Pension income (3,231) (2,098) (6,464) (4,186)
Other plans:        
Defined contribution plans 7,961 6,882 16,416 16,907
Foreign plans and other 2,123 1,832 4,357 3,873
Total other plans 10,084 8,714 20,773 20,780
Total net pension expense $ 6,853 $ 6,616 $ 14,309 $ 16,594