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Other, Net - Other Net in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Other Nonoperating Income Expense [Abstract] |  |  |  |
Foreign exchange gain (loss) | $ 374 | $ (274) | $ 333 | $ 895
Investment income | 106 | 91 | 309 | 320
Realized and unrealized gain (loss) on investments | (324) | 737 | 2,806 | 1,241
Net periodic pension benefit cost | 159 | (208) | 247 | (466)
Gain on sale of asset | 570 |  | 570 |
Other, net | $ 885 | $ 346 | $ 4,265 | $ 1,990

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