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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 29, 2012
Dec. 31, 2011
Inventory Disclosure [Line Items]    
Raw materials $ 33,051 $ 30,406
Work-in-process 12,078 12,943
Finished goods 6,832 6,563
Demo and consigned inventory 1,752 1,627
Total inventories $ 53,713 $ 51,539