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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount | $ 414,208 | [1] | $ 546,388 |
Accumulated Amortization | 306,868 | [1],[2] | 303,227 | [3],[4]
Foreign Currency Translation Adjustment | (6,939) |  | (3,330) |
Net Carrying Amount | $ 100,401 |  | $ 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 | $ 270,877 | [1] | $ 382,262 |
Accumulated Amortization | 206,376 | [1],[2] | 220,346 | [3],[4]
Foreign Currency Translation Adjustment | (5,093) |  | (2,444) |
Net Carrying Amount | $ 59,408 |  | $ 159,472 |
Weighted Average Useful Life, years | 6 years |  | 6 years |
Customer Relationships |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount | $ 92,741 | [1] | $ 110,602 |
Accumulated Amortization | 76,707 | [1],[2] | 63,722 | [3],[4]
Foreign Currency Translation Adjustment | (538) |  | (258) |
Net Carrying Amount | $ 15,496 |  | $ 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 | $ 50,100 | [1] | $ 53,034 |
Accumulated Amortization | 23,435 | [1],[2] | 18,889 | [3],[4]
Foreign Currency Translation Adjustment | (1,308) |  | (628) |
Net Carrying Amount | $ 25,357 |  | $ 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 |
Accumulated Amortization | 180 | [1],[2] | 100 | [3],[4]
Net Carrying Amount | $ 140 |  | $ 220 |
Weighted Average Useful Life, years | 4 years |  | 4 years |
Customer backlog |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount | $ 170 | [1] | $ 170 |
Accumulated Amortization | $ 170 | [1],[2] | $ 170 | [3],[4]
Weighted Average Useful Life, years | 3 months 18 days |  | 3 months 18 days |
[1] | During the year ended December 31, 2016, Teradyne recorded an $83.3 million impairment of Wireless Test amortizable intangible assets. The impairment assets have been eliminated from the gross carrying amount and accumulated amortization.
[2] | In 2016, $48.1 million of amortizable intangible assets became fully amortized and has been eliminated from the gross carrying amount and accumulated amortization.
[3] | During the year ended December 31, 2015, Teradyne recorded intangible assets in the amount of $121.6 million related to its Universal Robots acquisition.
[4] | During the year ended December 31, 2015, Teradyne wrote off $98.2 million of fully amortized intangible assets.

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