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Schedule of Amortizable Intangible Assets (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 11, 2015
Jul. 03, 2016
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets        
Fully amortized intangible assets wrote off   $ 83,339 [1],[2] $ 83,339 $ 98,200
Gross Carrying Amount     414,208 [3] 546,388
Accumulated Amortization     306,868 [3],[4] 303,227 [5],[6]
Net Carrying Amount     100,401 239,831
Universal Robots        
Finite-Lived Intangible Assets        
Intangible assets $ 121,590     $ 121,600
Wireless Test        
Finite-Lived Intangible Assets        
Fully amortized intangible assets wrote off     83,339  
Net Carrying Amount   $ 5,000    
Fully Amortized Intangibles        
Finite-Lived Intangible Assets        
Gross Carrying Amount     48,100  
Accumulated Amortization     48,100  
Net Carrying Amount     $ 0  
[1] Restructuring and other includes $4.2 million for an impairment of fixed assets, $0.9 million for expenses related to an earthquake in Kumamoto, Japan, and $1.4 million for the increase in the fair value of contingent consideration liability of which $0.8 million related to Universal Robots, and $0.6 million related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[2] Teradyne recorded pension and post retirement net actuarial (gains) losses of $(1.2) million, $(0.7) million, $0.7 million and $(2.0) million for the first, second, third and fourth quarter in 2016, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[3] 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.
[4] In 2016, $48.1 million of amortizable intangible assets became fully amortized and has been eliminated from the gross carrying amount and accumulated amortization.
[5] During the year ended December 31, 2015, Teradyne recorded intangible assets in the amount of $121.6 million related to its Universal Robots acquisition.
[6] During the year ended December 31, 2015, Teradyne wrote off $98.2 million of fully amortized intangible assets.