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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2014
Dec. 31, 2015
Oct. 04, 2015
Jul. 05, 2015
Dec. 31, 2014
Sep. 28, 2014
Jun. 29, 2014
 [5]
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                    
Restructuring and other   $ 5,204 [1],[2] $ 261 [3] $ (385) [4] $ 1,198 [5],[6],[7] $ (405) [5],[8] $ 572 $ 5,080 $ 1,365 $ 2,080
Goodwill impairment charge         98,897 [5],[6],[7]       98,897 0
Contingent consideration adjustment               2,489 (630)  
Gain from the sale of an equity investment               5,406   34,212
Stock based compensation expense $ 6,600             30,451 40,307 36,612
Selling and Administrative                    
Segment Reporting Information [Line Items]                    
Stock based compensation expense               18,024 26,486 19,822
Universal Robots                    
Segment Reporting Information [Line Items]                    
Contingent consideration adjustment   5,339           5,339    
Acquisition related costs               1,104    
ZTEC Instruments, Inc.                    
Segment Reporting Information [Line Items]                    
Contingent consideration adjustment       $ (1,600)   $ (630)   (1,600) (630)  
Avionics Interface Technologies, LLC                    
Segment Reporting Information [Line Items]                    
Contingent consideration adjustment   $ (300) $ (1,000)         (1,250)    
Acquisition related costs                 372  
System Test                    
Segment Reporting Information [Line Items]                    
Cost of revenues-inventory charge               8,324 2,125 4,168
Restructuring and other               1,037 742 1,431
Goodwill impairment charge         $ 0          
Semiconductor Test                    
Segment Reporting Information [Line Items]                    
Cost of revenues-inventory charge               10,508 14,389 5,218
Restructuring and other               499 490 1,016
Wireless Test                    
Segment Reporting Information [Line Items]                    
Cost of revenues-inventory charge               2,500 5,679 7,206
Restructuring and other                 565 82
Goodwill impairment charge                 98,897  
Industrial Automation                    
Segment Reporting Information [Line Items]                    
Cost of revenues-inventory step-up [9]               1,567    
Corporate And Eliminations                    
Segment Reporting Information [Line Items]                    
Restructuring and other                 198 (449)
Corporate And Eliminations | Restructuring and other                    
Segment Reporting Information [Line Items]                    
Acquisition related costs               1,104 372  
Corporate And Eliminations | Other (income) expense, net                    
Segment Reporting Information [Line Items]                    
Gain from the sale of an equity investment               (5,406)   $ (34,212)
Corporate And Eliminations | Selling and Administrative                    
Segment Reporting Information [Line Items]                    
Stock based compensation expense [10]                 6,598  
Corporate And Eliminations | Universal Robots | Restructuring and other                    
Segment Reporting Information [Line Items]                    
Contingent consideration adjustment               5,339    
Corporate And Eliminations | ZTEC Instruments, Inc. | Restructuring and other                    
Segment Reporting Information [Line Items]                    
Contingent consideration adjustment               (1,600) $ (630)  
Corporate And Eliminations | Avionics Interface Technologies, LLC | Restructuring and other                    
Segment Reporting Information [Line Items]                    
Contingent consideration adjustment               $ (1,250)    
[1] In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[2] Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[3] Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[4] Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] Dividends declared by Teradyne's Board of Directors were paid in the second, third and fourth quarters of 2014.
[6] In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[7] In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[8] Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[9] Included in the cost of revenues for the years ended December 31, 2015 is the cost for purchase accounting inventory step-up.
[10] Expense related to the January 2014 retirement of Teradyne's former chief executive officer; see Note N: "Stock-Based Compensation."