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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Oct. 04, 2015
[3]
Jul. 05, 2015
[4]
Apr. 05, 2015
Dec. 31, 2014
Sep. 28, 2014
[5],[8]
Jun. 29, 2014
[5]
Mar. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Revenues $ 318,444 [1],[2] $ 465,994 $ 512,739 $ 342,401 $ 323,236 [5],[6],[7] $ 478,010 $ 525,567 $ 321,010 $ 1,639,578 [9] $ 1,647,824 [9] $ 1,427,933 [9]
Income (loss) before taxes (8,857) [1],[2] $ 87,408 $ 132,136 $ 42,438 (124,813) [5],[6],[7] $ 100,670 $ 121,392 $ (1,873) 253,124 [10],[11] 95,376 [10],[11] 201,922 [10],[11]
Total assets [12] 2,548,674       2,538,520       2,548,674 2,538,520 2,629,824
Property additions                 89,878 168,982 106,731
Depreciation and amortization expense                 140,772 152,544 150,687
Semiconductor Test                      
Segment Reporting Information [Line Items]                      
Revenues                 1,201,530 1,300,790 1,023,041
Income (loss) before taxes [10],[11]                 260,154 255,803 153,797
Total assets [12] 610,869       580,501       610,869 580,501 632,840
Property additions                 79,052 159,783 94,303
Depreciation and amortization expense                 64,415 84,990 72,472
Wireless Test                      
Segment Reporting Information [Line Items]                      
Revenues                 184,572 184,535 251,871
Income (loss) before taxes [10],[11]                 (13,830) (116,196) 23,153
Total assets [12] 427,880       478,974       427,880 478,974 645,001
Property additions                 3,133 3,730 5,358
Depreciation and amortization expense                 53,440 53,308 51,675
System Test                      
Segment Reporting Information [Line Items]                      
Revenues                 211,584 162,499 153,021
Income (loss) before taxes [10],[11]                 25,101 12,116 3,115
Total assets [12] 102,547       95,105       102,547 95,105 79,983
Property additions                 6,228 5,469 7,070
Depreciation and amortization expense                 4,390 5,399 5,180
Industrial Automation                      
Segment Reporting Information [Line Items]                      
Revenues                 41,892    
Income (loss) before taxes [10],[11]                 (7,574)    
Total assets [12] 344,260               344,260    
Property additions                 1,465    
Depreciation and amortization expense                 14,500    
Corporate And Eliminations                      
Segment Reporting Information [Line Items]                      
Income (loss) before taxes [10],[11]                 (10,727) (56,347) 21,857
Total assets [12] $ 1,063,118       $ 1,383,940       1,063,118 1,383,940 1,272,000
Depreciation and amortization expense                 $ 4,027 $ 8,847 $ 21,360
[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] Revenues attributable to a country are based on location of customer site.
[10] Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and goodwill impairment charges.
[11] Interest income, interest expense, other (income) expense, net, contingent consideration adjustments and pension and postretirement plans actuarial gains and losses are included in Corporate and Eliminations.
[12] Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.