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Other Income (Expense), Net - Components of Other Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Rental income	$ 792	$ 792	$ 462
Foreign currency gains (losses), net	(260)	323	(268)
Interest income	257	124	68
Gain (loss) on disposal of equipment	57	14	(4)
Credit gains on available-for-sale securities	7	11	13
Other	21	(2)	13
Total other income (expense), net	$ 874	$ 1,262	$ 284

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Other Miscellaneous Nonoperating Income Expense

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