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Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Inventory Disclosure [Line Items]
Raw materials	$ 40,247	$ 30,554
Work-in-process	10,448	11,959
Finished goods	11,562	8,023
Demo and consigned inventory	2,645	2,265
Total inventories	$ 64,902	$ 52,801

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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