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Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 28, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 85,698 | $ 85,857
Accumulated Amortization | (70,760) | (64,578)
Total future amortization expense | $ 14,938 | 21,279
Developed Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 1 year 4 months 24 days |
Gross Carrying Amount | $ 31,707 | 31,707
Accumulated Amortization | (24,281) | (20,396)
Total future amortization expense | $ 7,426 | 11,311
Customer relationships/contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 2 years 4 months 24 days |
Gross Carrying Amount | $ 44,718 | 44,819
Accumulated Amortization | (37,431) | (35,205)
Total future amortization expense | $ 7,287 | 9,614
Trademarks and Trade Names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 1 year 4 months 24 days |
Gross Carrying Amount | $ 635 | 654
Accumulated Amortization | (410) | (300)
Total future amortization expense | 225 | 354
Maintenance Agreements and Related Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,500 | 5,500
Accumulated Amortization | (5,500) | (5,500)
Total future amortization expense | 0 | 0
Order Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,138 | 3,177
Accumulated Amortization | (3,138) | (3,177)
Total future amortization expense | $ 0 | $ 0

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