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Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Semiconductor Test
    
Segment Reporting Information [Line Items]    
Cost of revenues-provision for excess and obsolete inventory $ 213 $ 212
Total 213 212
Wireless Test
    
Segment Reporting Information [Line Items]    
Cost of revenues-inventory step-up   4,871
Cost of revenues-provision for excess and obsolete inventory 2,668 473
Total 2,668 5,344
Systems Test Group
    
Segment Reporting Information [Line Items]    
Cost of revenues-provision for excess and obsolete inventory 919 889
Restructuring and other 244  
Total 1,163 889
Corporate And Eliminations
    
Segment Reporting Information [Line Items]    
Restructuring and other   (1,825)
Total   $ (1,825)