Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total	[1],[2]	$ 3,702,881	$ 3,121,469	$ 2,294,965
Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		2,642,342	2,259,597	1,552,571
System Test
Disaggregation of Revenue [Line Items]
Total	[1]	467,739	409,729	287,455
Industrial Automation
Disaggregation of Revenue [Line Items]
Total		375,905	279,731	298,139
Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	216,895	173,016	157,315
Corporate and Other
Disaggregation of Revenue [Line Items]
Total	[1]		(604)	(515)
Point in Time
Disaggregation of Revenue [Line Items]
Total	[1]	3,335,446	2,804,167	1,993,077
Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	409,383	348,454	237,686
Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	204,247	163,834	148,322
Point in Time | Corporate and Other
Disaggregation of Revenue [Line Items]
Total	[1]		(604)	(515)
Over Time
Disaggregation of Revenue [Line Items]
Total	[1]	367,435	317,302	301,888
Over Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	58,356	61,275	49,769
Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	12,648	9,182	8,993
Americas
Disaggregation of Revenue [Line Items]
Total	[1]	405,736	335,442	338,384
Americas | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	135,230	128,482	129,840
Americas | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	36,173	22,544	24,234
Americas | Corporate and Other
Disaggregation of Revenue [Line Items]
Total	[1]		(604)	(515)
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	[1]	265,764	208,196	228,071
Europe, Middle East and Africa | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	25,697	22,726	24,789
Europe, Middle East and Africa | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	8,619	6,503	6,532
Asia Pacific
Disaggregation of Revenue [Line Items]
Total	[1]	3,031,381	2,577,831	1,728,510
Asia Pacific | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	306,812	258,521	132,826
Asia Pacific | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	172,103	143,969	126,549
SOC | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	2,246,730	1,877,389	1,286,440
SOC | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	1,989,979	1,659,414	1,070,375
SOC | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	256,751	217,975	216,065
SOC | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	102,702	77,671	73,257
SOC | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	67,381	55,125	60,302
SOC | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	2,076,647	1,744,593	1,152,881
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	395,612	382,208	266,131
Memory | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	365,441	363,324	247,221
Memory | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	30,171	18,884	18,910
Memory | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	10,665	12,999	23,826
Memory | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	3,503	5,209	3,591
Memory | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	381,444	364,000	238,714
Universal Robots (UR) | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	311,182	221,481	252,358
Universal Robots (UR) | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	305,512	214,212	244,515
Universal Robots (UR) | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	5,670	7,269	7,843
Universal Robots (UR) | Americas | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	94,897	64,164	71,926
Universal Robots (UR) | Europe, Middle East and Africa | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	134,829	97,040	112,405
Universal Robots (UR) | Asia Pacific | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	81,456	60,277	68,027
MiR | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	63,544	44,833	44,403
MiR | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	60,778	44,622	44,329
MiR | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	2,766	211	74
MiR | Americas | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	24,890	16,769	14,438
MiR | Europe, Middle East and Africa | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	25,735	21,593	20,452
MiR | Asia Pacific | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	12,919	6,471	9,513
Autoguide LLC [Member] | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	1,179	13,417	1,378
Autoguide LLC [Member] | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	106	10,911	1,144
Autoguide LLC [Member] | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	1,073	2,506	234
Autoguide LLC [Member] | Americas | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	$ 1,179	$ 13,417	$ 1,378

[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.