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Schedule of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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.