Summary of Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 120,555	$ 116,159
Less accumulated depreciation	(72,554)	(70,458)
Total Property, plant and equipment	48,001	45,701
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,458	2,458
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	12,634	12,537
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	89,568	89,089
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	8,650	8,400
Automotive equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	312	312
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 6,933	$ 3,363

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived 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, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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