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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Other Nonoperating Income Expense [Abstract] |  |  |  |  |  |  |
Foreign exchange gains (losses) |  | $ (274) | $ 596 |  | $ 895 | $ 97 |
Investment income |  | 91 | 69 |  | 320 | 220 |
Realized and unrealized gains on investments |  | 737 | 1,101 |  | 1,241 | 3,677 |
Net periodic benefit cost |  | (208) | (125) |  | (466) | (468) |
Other, net | [1] | $ 346 | $ 1,641 | [2] | $ 1,990 | $ 3,526 | [2]
[1] | The 2017 amounts for the noted line items have been immaterially changed from the amounts originally reported as a result of the Company’s first quarter 2018 adoption of Accounting Standards Update (ASU) No. 2017-7, Compensation –Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.
[2] | The 2017 data has been immaterially changed from the amounts originally reported as a result of the Company’s first quarter 2018 adoption of ASU No. 2017-7, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost

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