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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 02, 2016
 [2],[3]
Jul. 03, 2016
 [2],[4]
Apr. 03, 2016
 [2],[5]
Dec. 31, 2015
Oct. 04, 2015
 [8]
Jul. 05, 2015
 [9]
Apr. 05, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Revenues $ 379,989 [1],[2] $ 410,475 $ 531,792 $ 430,994 $ 318,444 [6],[7] $ 465,994 $ 512,739 $ 342,401 $ 1,753,250 [10] $ 1,639,578 [10] $ 1,647,824 [10]
Income (loss) before taxes 58,884 [1],[2] $ 59,681 $ (230,817) $ 57,192 (8,857) [6],[7] $ 87,408 $ 132,136 $ 42,438 (55,060) [11],[12] 253,124 [11],[12] 95,376 [11],[12]
Total assets [13] 2,762,493       2,548,674       2,762,493 2,548,674 2,538,520
Property additions                 85,272 89,878 168,982
Depreciation and amortization expense                 120,009 140,773 152,544
Semiconductor Test                      
Segment Reporting Information [Line Items]                      
Revenues                 1,368,169 1,201,530 1,300,790
Income (loss) before taxes [11],[12]                 311,939 260,154 255,803
Total assets [13] 557,546       610,869       557,546 610,869 580,501
Property additions                 70,543 79,052 159,783
Depreciation and amortization expense                 58,087 64,415 84,990
Wireless Test                      
Segment Reporting Information [Line Items]                      
Revenues                 96,204 184,572 184,535
Income (loss) before taxes [11],[12]                 (371,409) (13,830) (116,196)
Total assets [13] 62,366       427,880       62,366 427,880 478,974
Property additions                 4,186 3,133 3,730
Depreciation and amortization expense                 25,921 53,440 53,308
System Test                      
Segment Reporting Information [Line Items]                      
Revenues                 189,846 211,584 162,499
Income (loss) before taxes [11],[12]                 28,916 25,101 12,116
Total assets [13] 110,361       102,547       110,361 102,547 95,105
Property additions                 3,788 6,228 5,469
Depreciation and amortization expense                 6,551 4,391 5,399
Industrial Automation                      
Segment Reporting Information [Line Items]                      
Revenues                 99,031 41,892  
Income (loss) before taxes [11],[12]                 (16,783) (7,574)  
Total assets [13] 317,635       344,260       317,635 344,260  
Property additions                 6,755 1,465  
Depreciation and amortization expense                 26,869 14,500  
Corporate And Eliminations                      
Segment Reporting Information [Line Items]                      
Income (loss) before taxes [11],[12]                 (7,723) (10,727) (56,347)
Total assets [13] $ 1,714,585       $ 1,063,118       1,714,585 1,063,118 1,383,940
Depreciation and amortization expense                 $ 2,581 $ 4,027 $ 8,847
[1] Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[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] Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[4] 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.
[5] Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[6] 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 Teradyne's accounting policy.
[7] 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.
[8] Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[9] Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[10] Revenues attributable to a country are based on location of customer site.
[11] Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges, goodwill impairment charges and acquired intangible assets impairment charge.
[12] 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.
[13] Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.