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Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Total [1],[2] $ 3,121,469 $ 2,294,965 $ 2,100,802
Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total 2,259,597 1,552,571 1,492,417
System Test      
Disaggregation of Revenue [Line Items]      
Total [1] 409,729 287,455 216,132
Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total 279,731 298,139 261,452
Wireless Test      
Disaggregation of Revenue [Line Items]      
Total [1] 173,016 157,315 132,006
Corporate and Other      
Disaggregation of Revenue [Line Items]      
Total [1] (604) (515) (1,205)
Point in Time      
Disaggregation of Revenue [Line Items]      
Total [1] 2,804,166 1,993,077 1,815,171
Point in Time | System Test      
Disaggregation of Revenue [Line Items]      
Total [1] 348,454 237,686 167,418
Point in Time | Wireless Test      
Disaggregation of Revenue [Line Items]      
Total [1] 163,834 148,322 122,536
Point in Time | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Total [1] (604) (515) (1,205)
Over Time      
Disaggregation of Revenue [Line Items]      
Total [1] 317,302 301,888 285,631
Over Time | System Test      
Disaggregation of Revenue [Line Items]      
Total [1] 61,275 49,769 48,714
Over Time | Wireless Test      
Disaggregation of Revenue [Line Items]      
Total [1] 9,182 8,993 9,470
Americas      
Disaggregation of Revenue [Line Items]      
Total [1] 335,441 338,384 288,379
Americas | System Test      
Disaggregation of Revenue [Line Items]      
Total [1] 128,482 129,840 96,763
Americas | Wireless Test      
Disaggregation of Revenue [Line Items]      
Total [1] 22,544 24,234 19,166
Americas | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Total [1] (604) (515) (1,205)
Europe, Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Total [1] 208,196 228,071 235,977
Europe, Middle East and Africa | System Test      
Disaggregation of Revenue [Line Items]      
Total [1] 22,726 24,789 28,380
Europe, Middle East and Africa | Wireless Test      
Disaggregation of Revenue [Line Items]      
Total [1] 6,503 6,532 4,968
Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total [1] 2,577,831 1,728,510 1,576,446
Asia Pacific | System Test      
Disaggregation of Revenue [Line Items]      
Total [1] 258,521 132,826 90,989
Asia Pacific | Wireless Test      
Disaggregation of Revenue [Line Items]      
Total [1] 143,969 126,549 107,872
SOC | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 1,877,389 1,286,440 1,218,949
SOC | Point in Time | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 1,659,414 1,070,375 1,010,493
SOC | Over Time | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 217,975 216,065 208,456
SOC | Americas | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 77,671 73,257 78,498
SOC | Europe, Middle East and Africa | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 55,125 60,302 72,572
SOC | Asia Pacific | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 1,744,593 1,152,881 1,067,879
Memory | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 382,208 266,131 273,468
Memory | Point in Time | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 363,324 247,221 259,366
Memory | Over Time | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 18,884 18,910 14,102
Memory | Americas | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 12,999 23,826 17,353
Memory | Europe, Middle East and Africa | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 5,209 3,591 10,851
Memory | Asia Pacific | Semiconductor Test      
Disaggregation of Revenue [Line Items]      
Total [1] 364,000 238,714 245,264
Universal Robots (UR) | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 221,481 252,358 237,337
Universal Robots (UR) | Point in Time | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 214,212 244,515 232,448
Universal Robots (UR) | Over Time | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 7,269 7,843 4,889
Universal Robots (UR) | Americas | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 64,164 71,926 70,478
Universal Robots (UR) | Europe, Middle East and Africa | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 97,040 112,405 108,367
Universal Robots (UR) | Asia Pacific | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 60,277 68,027 58,492
MiR | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 44,833 44,403 24,115
MiR | Point in Time | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 44,622 44,329 24,115
MiR | Over Time | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 211 74  
MiR | Americas | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 16,769 14,438 7,326
MiR | Europe, Middle East and Africa | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 21,593 20,452 10,839
MiR | Asia Pacific | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 6,471 9,513 $ 5,950
Autoguide LLC [Member] | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 13,417 1,378  
Autoguide LLC [Member] | Point in Time | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 10,911 1,144  
Autoguide LLC [Member] | Over Time | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] 2,506 234  
Autoguide LLC [Member] | Americas | Industrial Automation      
Disaggregation of Revenue [Line Items]      
Total [1] $ 13,417 $ 1,378  
[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.