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Other, Net - Other Net in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands		12 Months Ended
		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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