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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Oct. 02, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount | $ 497,547 | [1] | $ 546,388 | [2]
Accumulated Amortization | 382,428 | [1],[3] | 303,227 | [2]
Foreign Currency Translation Adjustment | (973) |  | (3,330) |
Net Carrying Amount | $ 114,146 |  | $ 239,831 |
Weighted Average Useful Life, years | 6 years 9 months 18 days |  | 6 years 8 months 12 days |
Developed technology |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount | $ 333,421 | [1] | $ 382,262 | [2]
Accumulated Amortization | 264,248 | [1],[3] | 220,346 | [2]
Foreign Currency Translation Adjustment | (714) |  | (2,444) |
Net Carrying Amount | $ 68,459 |  | $ 159,472 |
Weighted Average Useful Life, years | 6 years |  | 6 years |
Customer Relationships |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount | $ 110,602 | [1] | $ 110,602 | [2]
Accumulated Amortization | 92,139 | [1],[3] | 63,722 | [2]
Foreign Currency Translation Adjustment | (75) |  | (258) |
Net Carrying Amount | $ 18,388 |  | $ 46,622 |
Weighted Average Useful Life, years | 7 years 10 months 24 days |  | 7 years 10 months 24 days |
Trademarks and tradenames |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount | $ 53,034 | [1] | $ 53,034 | [2]
Accumulated Amortization | 25,711 | [1],[3] | 18,889 | [2]
Foreign Currency Translation Adjustment | (184) |  | (628) |
Net Carrying Amount | $ 27,139 |  | $ 33,517 |
Weighted Average Useful Life, years | 9 years 6 months |  | 9 years 6 months |
Non-compete agreements |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount | $ 320 | [1] | $ 320 | [2]
Accumulated Amortization | 160 | [1],[3] | 100 | [2]
Net Carrying Amount | $ 160 |  | $ 220 |
Weighted Average Useful Life, years | 4 years |  | 4 years |
Customer backlog |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount | $ 170 | [1] | $ 170 | [2]
Accumulated Amortization | $ 170 | [1],[3] | $ 170 | [2]
Weighted Average Useful Life, years | 3 months 18 days |  | 3 months 18 days |
[1] | In 2016, $48 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
[2] | In 2015, $98.2 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
[3] | Includes an $83 million impairment of Wireless Test amortizable intangible assets.

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