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Schedule of Revenues by Country (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [1],[2] $ 3,121,469 $ 2,294,965 $ 2,100,802
CHINA      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 465,722 514,327 348,942
TAIWAN      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 1,178,068 485,681 516,322
UNITED STATES      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 321,674 333,059 282,869
KOREA      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 391,571 239,504 163,224
Europe      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 205,587 219,015 223,207
JAPAN      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 143,983 175,322 158,281
THAILAND      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 138,787 87,503 59,184
SINGAPORE      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 76,460 84,111 108,618
MALAYSIA      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 56,096 58,200 122,797
PHILIPPINES      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] 68,887 54,560 77,996
Rest Of The World      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from unaffiliated customers [2] $ 74,634 $ 43,683 $ 39,362
[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.