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Segment Information - Information About Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jul. 01, 2012 | Jun. 30, 2013 | Jul. 01, 2012
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | $ 79,698 | $ 78,449 | $ 154,370 | $ 149,856
Service revenue | 6,812 | 5,877 | 13,032 | 12,179
Operating income | 20,173 | 23,350 | 38,154 | 41,091
MVSD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | 72,012 | 69,743 | 140,331 | 133,964
Service revenue | 2,301 | 1,778 | 4,393 | 3,698
Operating income | 23,527 | 25,035 | 45,603 | 46,179
SISD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | 7,686 | 8,706 | 14,039 | 15,892
Service revenue | 4,511 | 4,099 | 8,639 | 8,481
Operating income | 2,227 | 2,848 | 3,959 | 5,240
Reconciling Items [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ (5,581) | $ (4,533) | $ (11,408) | $ (10,328)

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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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