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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Revenues $ 819,484 [1] $ 582,038 [1] $ 2,362,500 [2] $ 1,640,315 [2]  
Income (loss) before income taxes [3],[4] 263,731 151,733 678,089 376,889  
Total assets 3,436,512 [5] 2,698,791 [5] 3,436,512 [5] 2,698,791 [5] $ 2,787,014
Semiconductor Test          
Segment Reporting Information [Line Items]          
Revenues 592,141 397,737 1,735,777 1,113,489  
Income (loss) before income taxes [3],[4] 189,116 116,633 571,719 291,037  
Total assets [5] 1,069,830 757,422 1,069,830 757,422  
System Test          
Segment Reporting Information [Line Items]          
Revenues 118,169 [1] 73,305 [1] 306,051 [2] 204,934 [2]  
Income (loss) before income taxes [3],[4] 47,368 24,381 114,968 63,254  
Total assets [5] 667,132 580,635 667,132 580,635  
Industrial Automation          
Segment Reporting Information [Line Items]          
Revenues 68,711 68,892 187,792 209,753  
Income (loss) before income taxes [3],[4] (5,302) (1,645) (32,041) (10,670)  
Total assets [5] 155,642 126,452 155,642 126,452  
Wireless Test          
Segment Reporting Information [Line Items]          
Revenues 40,504 [1] 42,264 [1] 133,174 [2] 112,541 [2]  
Income (loss) before income taxes [3],[4] 10,938 11,182 35,640 25,740  
Total assets [5] 108,671 94,789 108,671 94,789  
Corporate And Others [Member]          
Segment Reporting Information [Line Items]          
Revenues (41) (160) (294) (402)  
Income (loss) before income taxes [3],[4] 21,611 1,182 (12,197) 7,528  
Total assets [5] $ 1,435,237 $ 1,139,493 $ 1,435,237 $ 1,139,493  
[1] Includes $1.7 million and $1.5 million in 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”
[2] Includes $6.1 million and $4.9 million in 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside ASC 606 “Revenue from Contracts with Customers.”
[3] Included in Corporate and Other are: contingent consideration adjustments, employee severance charges, interest (income) and expense, net foreign exchange (gains) and losses, pension and postretirement plan actuarial (gains) and losses and settlement charges, intercompany eliminations, and certain acquisition related charges and compensation.
[4] Included in income (loss) before taxes are charges and credits related to restructuring and other, and inventory charges.
[5] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.