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Other, Net - Other Net in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Nonoperating Income Expense [Abstract] |  |  |  |
Foreign exchange gains (losses) |  | $ 1,902 | $ (646) | $ (14)
Investment income |  | 1,554 | 989 | 690
Realized and unrealized gains(losses) on investments |  | (2,966) | 4,178 | 152
Net periodic benefit cost |  | (1,215) | (1,035) | (1,637)
Other, net | [1] | $ (725) | $ 3,486 | $ (809)
[1] | The 2017 and 2016 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 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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