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Schedule of Revenues by Country (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [1],[2] | $ 3,702,881 | $ 3,121,469 | $ 2,294,965
CHINA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 631,963 | 465,722 | 514,327
TAIWAN |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 1,117,874 | 1,178,068 | 485,681
UNITED STATES |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 392,626 | 321,674 | 333,059
KOREA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 502,167 | 391,571 | 239,504
Europe |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 259,954 | 205,587 | 219,015
JAPAN |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 166,231 | 143,983 | 175,322
THAILAND |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 138,812 | 138,787 | 87,503
SINGAPORE |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 121,582 | 76,460 | 84,111
MALAYSIA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 136,774 | 56,096 | 58,200
PHILIPPINES |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | 166,838 | 68,887 | 54,560
Rest Of The World |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from unaffiliated customers | [2] | $ 68,060 | $ 74,634 | $ 43,683
[1] | Includes $13.2 million, $10.0 million and $8.4 million in 2021, 2020 and 2019, 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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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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