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Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total gross value	$ 138,451	$ 134,435
Less accumulated depreciation	(89,199)	(85,114)
Total net value	49,252	49,321
Land
Property, Plant and Equipment [Line Items]
Total gross value	2,548	2,458
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total gross value	$ 17,555	16,678
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	10 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	30 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total gross value	$ 109,064	107,722
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	15 years
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total gross value	$ 5,655	4,925
Office furniture, fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	3 years
Office furniture, fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	10 years
Automotive equipment
Property, Plant and Equipment [Line Items]
Total gross value	$ 1,116	735
Automotive equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	3 years
Automotive equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	6 years
Construction in progress
Property, Plant and Equipment [Line Items]
Total gross value	$ 2,513	$ 1,917

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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