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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2012
Dec. 31, 2011
Inventory Disclosure [Line Items]    
Raw materials $ 32,150 $ 30,406
Work-in-process 12,373 12,943
Finished goods 6,929 6,563
Demo and consigned inventory 1,979 1,627
Total inventories $ 53,431 $ 51,539