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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 01, 2017
 [3]
Jul. 02, 2017
 [2],[4]
Apr. 02, 2017
 [5]
Dec. 31, 2016
Oct. 02, 2016
 [7],[8]
Jul. 03, 2016
 [7],[9]
Apr. 03, 2016
 [7],[10]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Revenues $ 479,415 [1],[2] $ 503,378 $ 696,901 $ 456,913 $ 379,989 [6],[7] $ 410,475 $ 531,792 $ 430,994 $ 2,136,606 [11] $ 1,753,250 [11] $ 1,639,578 [11]
Income (loss) before taxes [12],[13]                 524,412 (55,060) 253,124
Total assets [14] 3,109,545       2,762,493       3,109,545 2,762,493 2,548,674
Property additions                 105,375 85,272 89,878
Depreciation and amortization expense                 108,075 120,009 140,773
Semiconductor Test                      
Segment Reporting Information [Line Items]                      
Revenues                 1,662,549 1,368,169 1,201,530
Income (loss) before taxes [12],[13]                 491,361 311,939 260,154
Total assets [14] 597,480       557,546       597,480 557,546 610,869
Property additions                 87,920 70,543 79,052
Depreciation and amortization expense                 58,901 58,087 64,415
System Test                      
Segment Reporting Information [Line Items]                      
Revenues                 192,135 189,846 211,584
Income (loss) before taxes [12],[13]                 10,306 28,916 25,101
Total assets [14] 97,018       110,361       97,018 110,361 102,547
Property additions                 5,976 3,788 6,228
Depreciation and amortization expense                 6,646 6,551 4,391
Industrial Automation                      
Segment Reporting Information [Line Items]                      
Revenues                 170,056 99,031 41,892
Income (loss) before taxes [12],[13]                 8,763 (16,783) (7,574)
Total assets [14] 368,037       317,635       368,037 317,635 344,260
Property additions                 7,044 6,755 1,465
Depreciation and amortization expense                 25,711 26,869 14,500
Wireless Test                      
Segment Reporting Information [Line Items]                      
Revenues                 111,866 96,204 184,572
Income (loss) before taxes [12],[13]                 17,350 (371,409) (13,830)
Total assets [14] 59,912       62,366       59,912 62,366 427,880
Property additions                 4,435 4,186 3,133
Depreciation and amortization expense                 5,392 25,921 53,440
Corporate And Eliminations                      
Segment Reporting Information [Line Items]                      
Income (loss) before taxes [12],[13]                 (3,368) (7,723) (10,727)
Total assets [14] $ 1,987,098       $ 1,714,585       1,987,098 1,714,585 1,063,118
Depreciation and amortization expense                 $ 11,425 $ 2,581 $ 4,027
[1] Restructuring and other includes a $6.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, $1.8 million of employee severance charges, and $1.1 million of charges for impairment of fixed assets.
[2] Teradyne recorded pension and post retirement net actuarial gains of $2.5 million and $3.8 million for the second and fourth quarter in 2017, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[3] Restructuring and other includes $5.1 million of property insurance recovery related to the Japan earthquake, a $0.4 million credit related to previously impaired lease termination of a Wireless Test facility in Sunnyvale, CA, and a $0.3 million credit for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $0.8 million of Japan earthquake related expenses and $0.6 million of employee severance charges.
[4] Restructuring and other includes a $1.5 million charge for a fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.8 million of employee severance charges.
[5] Restructuring and other includes a $1.3 million charge for a lease impairment of a Wireless Test facility in Sunnyvale, CA, a $0.6 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.6 million of employee severance charges.
[6] Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[7] 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.
[8] Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[9] 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 a $1.4 million fair value adjustment to increase contingent consideration liability, of which $0.8 million was related to Universal Robots and $0.6 million was related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[10] Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[11] Revenues attributable to a country are based on location of customer site.
[12] Included in Corporate and Eliminations are: contingent consideration adjustments, pension and postretirement plans actuarial gains (losses), severance charges, impairment of fixed assets and expenses related to the Japan earthquake, property insurance recovery, interest income, interest expense, net foreign exchange gains (losses), and gain from the sale of an equity investment.
[13] Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges, goodwill impairment charges and an acquired intangible assets impairment charge.
[14] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.