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Segment Information - Information About Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2014 | Jun. 30, 2013 | Jun. 29, 2014 | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | $ 102,942 | $ 79,698 | $ 186,511 | $ 154,370
Service revenue | 5,860 | 6,812 | 13,220 | 13,032
Operating income | 30,722 | 20,173 | 53,165 | 38,154
Operating Segments | MVSD |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | 90,069 | 72,012 | 167,687 | 140,331
Service revenue | 2,207 | 2,301 | 5,905 | 4,393
Operating income | 34,184 | 23,527 | 62,476 | 45,603
Operating Segments | SISD |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenue | 12,873 | 7,686 | 18,824 | 14,039
Service revenue | 3,653 | 4,511 | 7,315 | 8,639
Operating income | 4,571 | 2,227 | 5,584 | 3,959
Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ (8,033) | $ (5,581) | $ (14,895) | $ (11,408)

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