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Segment Information - Information About Company's Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Oct. 02, 2011 | Sep. 30, 2012 | Oct. 02, 2011
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | $ 72,437 | $ 74,165 | $ 222,293 | $ 220,608
Service revenue | 7,639 | 5,920 | 19,818 | 17,264
Operating income | 21,803 | 22,389 | 62,894 | 63,799
MVSD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | 64,971 | 66,404 | 198,935 | 200,163
Service revenue | 3,291 | 1,771 | 6,989 | 5,574
Operating income | 22,664 | 23,422 | 68,843 | 72,036
SISD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | 7,466 | 7,761 | 23,358 | 20,445
Service revenue | 4,348 | 4,149 | 12,829 | 11,690
Operating income | 2,724 | 2,891 | 7,964 | 5,910
Reconciling Items [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ (3,585) | $ (3,924) | $ (13,913) | $ (14,147)

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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