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Schedule of Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Segment Reporting Information [Line Items]    
Net revenues $ 280,367 $ 396,668
Income (loss) before income taxes (1,426) [1],[2] 41,244 [1],[2]
Semiconductor Test
    
Segment Reporting Information [Line Items]    
Net revenues 211,506 267,588
Income (loss) before income taxes 13,766 [1],[2] 34,998 [1],[2]
Wireless Test
    
Segment Reporting Information [Line Items]    
Net revenues 33,598 31,328
Income (loss) before income taxes (9,997) [1],[2] (12,312) [1],[2]
Systems Test Group
    
Segment Reporting Information [Line Items]    
Net revenues 35,263 97,752
Income (loss) before income taxes 1,530 [1],[2] 21,978 [1],[2]
Corporate And Eliminations
    
Segment Reporting Information [Line Items]    
Income (loss) before income taxes $ (6,725) [1],[2] $ (3,420) [1],[2]
[1] Interest income and interest expense and other are included in Corporate and Eliminations.
[2] Included in the income (loss) before income taxes for each of the segments are charges and credits for the three months ended March 31, 2013 and April 1, 2012 that include restructuring and other, and provision for excess and obsolete inventory, as follows: