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Schedule of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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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:

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