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Accumulated Balances of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (22,246)	$ (22,332)	$ (21,983)
Net current period change	(155)	86	(349)
Ending balance	(22,401)	(22,246)	(22,332)
Foreign currency items
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(22,180)	(22,246)	(21,914)
Net current period change	224	66	(332)
Ending balance	(21,956)	(22,180)	(22,246)
Unrealized gain on securities
Accumulated Other Comprehensive Income Loss [Line Items]
Net current period change	(351)
Ending balance	(351)
Pension and post retirement benefit plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(66)	(86)	(69)
Net current period change	(28)	20	(17)
Ending balance	$ (94)	$ (66)	$ (86)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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