Schedule of Revenues by Country (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1],[2]	$ 2,676,298	$ 3,155,045	$ 3,702,881
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	433,661	469,948	392,626
KOREA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	394,690	544,816	502,167
TAIWAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	384,842	626,424	1,117,874
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	314,899	491,798	631,963
JAPAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	281,742	162,920	166,231
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	273,784	268,384	259,954
PHILIPPINES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	189,419	124,107	166,838
SINGAPORE
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	116,969	99,503	121,582
THAILAND
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	91,818	137,356	138,812
MALAYSIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	89,197	142,203	136,774
Rest Of The World
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	$ 105,277	$ 87,586	$ 68,060

[1] Includes $5.2 million, $8.2 million and $13.2 million in 2023, 2022 and 2021, 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.