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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Revenues [1],[2] $ 3,121,469 $ 2,294,965 $ 2,100,802
Income (loss) before taxes 901,015 525,772 467,801
Total assets 3,652,346 2,787,014 2,706,606
Property additions 184,977 134,642 114,379
Depreciation and amortization expense 126,743 120,655 113,224
Semiconductor Test      
Segment Reporting Information [Line Items]      
Revenues 2,259,597 1,552,571 1,492,417
Income (loss) before taxes 739,695 416,973 397,645
Total assets 1,070,378 784,808 669,452
Property additions 168,055 112,145 94,496
Depreciation and amortization expense 64,998 59,197 58,095
System Test      
Segment Reporting Information [Line Items]      
Revenues [1] 409,729 287,455 216,132
Income (loss) before taxes 152,092 93,543 48,857
Total assets 138,295 131,428 88,098
Property additions 3,092 3,059 3,469
Depreciation and amortization expense 3,426 5,518 6,430
Industrial Automation      
Segment Reporting Information [Line Items]      
Revenues 279,731 298,139 261,452
Income (loss) before taxes (24,019) (5,916) 7,670
Total assets 712,936 671,559 607,502
Property additions 8,899 9,076 11,188
Depreciation and amortization expense 36,242 40,904 36,755
Wireless Test      
Segment Reporting Information [Line Items]      
Revenues [1] 173,016 157,315 132,006
Income (loss) before taxes 41,950 35,585 29,052
Total assets 106,273 97,299 77,570
Property additions 4,931 10,362 5,226
Depreciation and amortization expense 6,258 5,365 5,328
Corporate And Others [Member]      
Segment Reporting Information [Line Items]      
Revenues (604) (515) (1,205)
Income (loss) before taxes (8,703) (14,413) (15,423)
Total assets 1,624,464 1,101,920 1,263,984
Depreciation and amortization expense $ 15,819 $ 9,671 $ 6,616
[1] Includes $10.0 million, $8.4 million and $12.0 million in 2020, 2019 and 2018, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”
[2] Revenues attributable to a country are based on location of customer site.