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Inventories - Summary of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw materials	$ 27,022	$ 28,362
Work-in-process	3,266	2,707
Finished goods	5,898	6,535
Inventory, gross	36,186	37,604
Inventory reserves	(8,199)	(7,649)
Net balance	$ 27,987	$ 29,955

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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