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Goodwill and Purchased Intangible Assets (Changes in Carrying Value of Goodwill by Reportable Segment) (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 29, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]    
Goodwill $ 58,060 [1] $ 58,498
Impact of currency exchange (103) (438)
Goodwill 57,957 58,060 [1]
Semiconductor Equipment [Member]
   
Segment Reporting Information [Line Items]    
Goodwill 54,872 55,280
Impact of currency exchange (96) (408)
Goodwill 54,776 54,872
Microwave Communications [Member]
   
Segment Reporting Information [Line Items]    
Goodwill 3,188 3,218
Impact of currency exchange (7) (30)
Goodwill $ 3,181 $ 3,188
[1] Derived from December 31, 2011 audited financial statements.