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Schedule of Revenues by Country (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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.

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