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Other, Net - Other Net in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Nonoperating Income Expense [Abstract] |  |  |
Foreign exchange gains (losses) | $ 123 | $ 1,902 | $ (646)
Investment income | 968 | 1,554 | 989
Realized and unrealized gains (losses) on investments | 3,955 | (2,966) | 4,178
Net periodic benefit cost | (351) | (1,215) | (1,035)
Gain on sale of asset | 570 |  |
Other retirement obligation | (694) |  |
Other, net | $ 4,571 | $ (725) | $ 3,486

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