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Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) - USD ($) $ in Thousands			12 Months Ended
		Oct. 31, 2014	Dec. 31, 2016	Jun. 11, 2015
Universal Robots
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration				$ 31,600
Avionics Interface Technologies, LLC
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration		$ 1,800
Discount rate		4.70%
Significant Unobservable Inputs (Level 3) | Avionics Interface Technologies, LLC
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration	[1]		$ 1,050
Monte Carlo simulation model | Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration			15,981
Monte Carlo simulation model | Significant Unobservable Inputs (Level 3) | Universal Robots
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration			$ 21,301
Monte Carlo simulation model | Revenue for the period July 1, 2015-December 31, 2017 | Universal Robots
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Target achievement, volatility			10.80%
Discount rate			3.30%
Monte Carlo simulation model | Revenue for the period July 1, 2015-December 31, 2018 | Universal Robots
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Target achievement, volatility			10.80%
Discount rate			3.30%
[1] Teradyne paid this amount in January 2017.

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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