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Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Total	[1]	$ 2,100,802	$ 2,136,606	$ 1,753,250
Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		1,492,417	1,662,549	1,368,169
System Test
Disaggregation of Revenue [Line Items]
Total		216,132	192,135	189,846
Industrial Automation
Disaggregation of Revenue [Line Items]
Total		261,452	170,056	99,031
Wireless Test
Disaggregation of Revenue [Line Items]
Total		132,006	$ 111,866	$ 96,204
Corporate and Other
Disaggregation of Revenue [Line Items]
Total		(1,205)
Americas | Point in Time
Disaggregation of Revenue [Line Items]
Total		219,755
Americas | Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total		17,730
Americas | Point in Time | Corporate and Other
Disaggregation of Revenue [Line Items]
Total		(1,205)
Americas | Over Time
Disaggregation of Revenue [Line Items]
Total		68,624
Americas | Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total		1,436
Europe, Middle East and Africa | Point in Time
Disaggregation of Revenue [Line Items]
Total		200,939
Europe, Middle East and Africa | Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total		3,821
Europe, Middle East and Africa | Over Time
Disaggregation of Revenue [Line Items]
Total		35,038
Europe, Middle East and Africa | Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total		1,147
Asia Pacific
Disaggregation of Revenue [Line Items]
Total		12,037
Asia Pacific | Wireless Test
Disaggregation of Revenue [Line Items]
Total		760
Asia Pacific | Point in Time
Disaggregation of Revenue [Line Items]
Total		1,394,477
Asia Pacific | Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total		100,985
Asia Pacific | Over Time
Disaggregation of Revenue [Line Items]
Total		169,932
Asia Pacific | Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total		6,127
SOC | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		1,218,949
SOC | Americas | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		43,398
SOC | Americas | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		35,100
SOC | Europe, Middle East and Africa | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		50,988
SOC | Europe, Middle East and Africa | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		21,584
SOC | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		10,885
SOC | Asia Pacific | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		916,107
SOC | Asia Pacific | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		140,887
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		273,468
Memory | Americas | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		14,579
Memory | Americas | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		2,774
Memory | Europe, Middle East and Africa | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		9,726
Memory | Europe, Middle East and Africa | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		1,125
Memory | Asia Pacific | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		235,061
Memory | Asia Pacific | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		10,203
Defense/Aerospace | System Test
Disaggregation of Revenue [Line Items]
Total		92,737
Defense/Aerospace | Americas | Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total		59,246
Defense/Aerospace | Americas | Over Time | System Test
Disaggregation of Revenue [Line Items]
Total		24,577
Defense/Aerospace | Europe, Middle East and Africa | Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total		3,056
Defense/Aerospace | Europe, Middle East and Africa | Over Time | System Test
Disaggregation of Revenue [Line Items]
Total		2,124
Defense/Aerospace | Asia Pacific | Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total		2,769
Defense/Aerospace | Asia Pacific | Over Time | System Test
Disaggregation of Revenue [Line Items]
Total		965
Storage Test | System Test
Disaggregation of Revenue [Line Items]
Total		66,648
Storage Test | Americas | Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total		767
Storage Test | Asia Pacific | Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total		58,004
Storage Test | Asia Pacific | Over Time | System Test
Disaggregation of Revenue [Line Items]
Total		7,877
Production Board Test | System Test
Disaggregation of Revenue [Line Items]
Total		56,747
Production Board Test | Americas | Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total		9,082
Production Board Test | Americas | Over Time | System Test
Disaggregation of Revenue [Line Items]
Total		3,091
Production Board Test | Europe, Middle East and Africa | Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total		16,733
Production Board Test | Europe, Middle East and Africa | Over Time | System Test
Disaggregation of Revenue [Line Items]
Total		6,467
Production Board Test | Asia Pacific | System Test
Disaggregation of Revenue [Line Items]
Total		392
Production Board Test | Asia Pacific | Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total		17,761
Production Board Test | Asia Pacific | Over Time | System Test
Disaggregation of Revenue [Line Items]
Total		3,221
Universal Robots (UR) | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		234,095
Universal Robots (UR) | Americas | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		68,289
Universal Robots (UR) | Americas | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		649
Universal Robots (UR) | Europe, Middle East and Africa | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		105,776
Universal Robots (UR) | Europe, Middle East and Africa | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		1,000
Universal Robots (UR) | Asia Pacific | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		57,830
Universal Robots (UR) | Asia Pacific | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		551
Mobile Industrial Robots (MiR) | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		24,115
Mobile Industrial Robots (MiR) | Americas | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		7,326
Mobile Industrial Robots (MiR) | Europe, Middle East and Africa | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		10,839
Mobile Industrial Robots (MiR) | Asia Pacific | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		5,950
Energid Technologies Corporation | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		3,242
Energid Technologies Corporation | Americas | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		543
Energid Technologies Corporation | Americas | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		997
Energid Technologies Corporation | Europe, Middle East and Africa | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		1,591
Energid Technologies Corporation | Asia Pacific | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		10
Energid Technologies Corporation | Asia Pacific | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total		$ 101
[1] Revenues attributable to a country are based on location of customer site.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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