Schedule of Segment Information (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	[1],[2]	$ 2,676,298	$ 3,155,045	$ 3,702,881
Income (loss) before taxes	[3],[4]	525,572	840,385	1,160,955
Total assets	[5]	3,486,824	3,501,252	3,809,425
Property additions		159,642	163,249	132,472
Depreciation and amortization expense		110,886	110,675	125,485
System Test
Segment Reporting Information [Line Items]
Revenues	[1]	338,197	469,346	467,739
Wireless Test
Segment Reporting Information [Line Items]
Revenues	[1]	144,282	201,720	216,895
Operating Segments
Segment Reporting Information [Line Items]
Revenues		2,676,298	3,154,794	3,702,881
Income (loss) before taxes	[3],[4]	523,710	851,943	1,215,428
Total assets	[5]	2,317,220	2,308,484	2,225,259
Property additions		159,642	163,249	132,472
Depreciation and amortization expense		111,116	110,097	112,529
Operating Segments | Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		1,818,636	2,080,590	2,642,342
Income (loss) before taxes	[3],[4]	453,320	634,488	976,988
Total assets	[5]	1,329,522	1,382,623	1,245,596
Property additions		113,415	126,898	115,618
Depreciation and amortization expense		77,745	76,532	75,982
Operating Segments | System Test
Segment Reporting Information [Line Items]
Revenues		338,197	469,346	467,739
Income (loss) before taxes	[3],[4]	94,073	166,879	163,064
Total assets	[5]	182,084	165,925	170,954
Property additions		3,643	7,275	3,905
Depreciation and amortization expense		3,801	3,235	3,156
Operating Segments | Robotics
Segment Reporting Information [Line Items]
Revenues		375,183	403,138	375,905
Income (loss) before taxes	[3],[4]	(54,251)	(16,244)	(8,167)
Total assets	[5]	737,323	665,638	701,196
Property additions		40,739	25,712	9,821
Depreciation and amortization expense		25,527	25,339	27,336
Operating Segments | Wireless Test
Segment Reporting Information [Line Items]
Revenues		144,282	201,720	216,895
Income (loss) before taxes	[3],[4]	30,568	66,820	83,543
Total assets	[5]	68,291	94,298	107,513
Property additions		1,845	3,364	3,128
Depreciation and amortization expense		4,043	4,991	6,055
Corporate and Eliminations
Segment Reporting Information [Line Items]
Revenues			(251)
Income (loss) before taxes	[3],[4]	(1,862)	11,558	54,473
Total assets	[5]	(1,169,604)	(1,192,768)	(1,584,166)
Depreciation and amortization expense		$ (230)	$ (578)	$ (12,956)

[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.

[3] Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, pension and postretirement plan actuarial gains (losses), legal and environmental fees, contingent consideration adjustments, acquisition and divestiture related expenses, contract termination settlement charge, an expense for the modification of Teradyne's former chief executive officer's outstanding equity awards, and loss on convertible debt conversions in 2021.

[4] Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and loss on convertible debt conversions in 2021.

[5] Total assets are attributable to each segment. Semiconductor Test includes $34.8 million of total assets classified as assets held for sale. See Note E: “Assets held for sale” for additional information. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.