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Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Semiconductor Test
        
Segment Reporting Information [Line Items]        
Cost of revenues-provision for excess and obsolete inventory $ 287 $ 5,957 $ 500 $ 6,169
Restructuring and other   286   286
Total 287 6,243 500 6,455
Wireless Test
        
Segment Reporting Information [Line Items]        
Cost of revenues-provision for excess and obsolete inventory 1,398 1,643 4,066 2,116
Cost of revenues-inventory step-up   1,218   6,089
Total 1,398 2,861 4,066 8,205
Systems Test Group
        
Segment Reporting Information [Line Items]        
Cost of revenues-provision for excess and obsolete inventory 290 1,753 1,209 2,642
Restructuring and other 131   375  
Total 421 1,753 1,584 2,642
Corporate And Eliminations
        
Segment Reporting Information [Line Items]        
Restructuring and other   (6,548)   (8,406)
Total   $ (6,548)   $ (8,406)