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Segment Information - Information About Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2013 | Sep. 30, 2012 | Sep. 29, 2013 | Sep. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | $ 83,464 | $ 72,437 | $ 237,834 | $ 222,293
Service revenue | 7,324 | 7,639 | 20,356 | 19,818
Operating income | 23,379 | 21,803 | 61,533 | 62,894
Operating Segments [Member] | MVSD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | 75,184 | 64,971 | 215,515 | 198,935
Service revenue | 2,758 | 3,291 | 7,151 | 6,989
Operating income | 26,038 | 22,664 | 71,641 | 68,843
Operating Segments [Member] | SISD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | 8,280 | 7,466 | 22,319 | 23,358
Service revenue | 4,566 | 4,348 | 13,205 | 12,829
Operating income | 2,916 | 2,724 | 6,875 | 7,964
Reconciling Items [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ (5,575) | $ (3,585) | $ (16,983) | $ (13,913)

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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=26872669&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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