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Other, Net - Other Net in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Nonoperating Income Expense [Abstract] |  |  |
Foreign exchange gains | $ 1,367 | $ 123 | $ 1,902
Investment income | 1,681 | 968 | 1,554
Realized and unrealized gains (losses) on investments | 3,143 | 3,955 | (2,966)
Net periodic benefit cost | (874) | (351) | (1,215)
Gain on sale of asset |  | 570 |
Other retirement obligation | (363) | (694) |
Other, net | $ 4,954 | $ 4,571 | $ (725)

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