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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2020

^[1],[2]

Sep. 30, 2020

Sep. 27, 2020

^[2],[3]

Jun. 30, 2020

Jun. 28, 2020

^[2],[4]

Mar. 31, 2020

Mar. 29, 2020

^[5]

Dec. 31, 2019

Sep. 30, 2019

Jun. 30, 2019

Mar. 31, 2019

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Segment Reporting Information [Line Items]

Acquisition related costs

$ 500

$ 3,100

$ 1,400

$ 200

$ 500

$ 500

$ 1,300

Restructuring and other-employee severance

$ (15,117)

$ (27,701)

$ 37,222

$ (7,606)

(2,088)

^[6],[7],[8]

(6,500)

^[9]

(10,404)

^[10]

5,112

^[11]

$ (13,202)

$ (13,880)

$ 15,232

Contingent consideration adjustment

(23,271)

(19,257)

987

Investment impairment

15,000

15,000

Universal Robots (UR)

Segment Reporting Information [Line Items]

Contingent consideration adjustment

$ 27,200

$ 29,900

$ 10,000

$ 7,800

$ 11,700

$ 3,000

3,800

Mobile Industrial Robots (MiR)

Segment Reporting Information [Line Items]

Contingent consideration adjustment

$ 5,800

Semiconductor Test

Segment Reporting Information [Line Items]

Acquisition related costs

2,500

2,500

Cost of revenues-inventory charge

1,277

8,429

Restructuring and other-employee severance

11,013

Contingent consideration adjustment

3,500

Contract termination settlement fee

4,000

Semiconductor Test | Severance And Benefits

Segment Reporting Information [Line Items]

Restructuring and other-employee severance

8,731

6,822

Industrial Automation

Segment Reporting Information [Line Items]

Acquisition related costs

985

741

1,163

Cost of revenues-inventory charge

887

2,000

1,175

Restructuring and other-employee severance

1,584

796

Industrial Automation | Restructuring and other

Segment Reporting Information [Line Items]

Acquisition related costs

1,728

1,765

Industrial Automation | Severance And Benefits

Segment Reporting Information [Line Items]

Restructuring and other-employee severance

3,422

System Test

Segment Reporting Information [Line Items]

Cost of revenues-inventory charge

834

508

680

Wireless Test

Segment Reporting Information [Line Items]

Cost of revenues-inventory charge

4,800

4,005

2,565

Corporate And Eliminations

Segment Reporting Information [Line Items]

Selling and administrative – equity modification charge

766

2,108

Corporate And Eliminations | Restructuring and other

Segment Reporting Information [Line Items]

Investment impairment

15,000

Corporate And Eliminations | Universal Robots (UR) | Restructuring and other

Segment Reporting Information [Line Items]

Contingent consideration adjustment

(16,679)

Corporate And Eliminations | Mobile Industrial Robots (MiR) | Restructuring and other

Segment Reporting Information [Line Items]

Restructuring and other-lease impairment

(3,546)

(22,199)

$ 17,666

Contingent consideration adjustment

$ (19,724)

$ 2,976

[1]	Restructuring and other includes a $15.3 million gain for the decrease in the fair value adjustment to the AutoGuide acquisition contingent consideration liability, and a $0.9 million gain for the decrease in acquisition related compensation liability, partially offset by $1.1 million of employee severance charges primarily in Industrial Automation.
[2]	Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $2.7 million, $7.7 million for the second, third and fourth quarter in 2020, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[3]	Restructuring and other includes a $27.2 million gain for the decrease in the fair value of AutoGuide contingent consideration liability, and a $1.1 million gain for the decrease in acquisition related compensation liability, partially offset by $0.5 million recorded for employee severance charges primarily in Industrial Automation.
[4]	Restructuring and other includes a $29.9 million charge for the increase in the fair value of the AutoGuide contingent consideration liability, a $4.0 million contract termination settlement charge, $3.1 million of acquisition related compensation and expense and $0.8 million of other expenses, partially offset by a $0.6 million gain for the decrease in the fair value of MiR contingent consideration liability.
[5]	Restructuring and other includes a $10.0 million gain for the decrease in the fair value of the AutoGuide and MiR contingent consideration liabilities, partially offset by $1.4 million of acquisition related compensation and expenses and $0.7 million of severance charges related to headcount reductions primarily in Industrial Automation and Semiconductor Test.
[6]	Other (income) expense, net includes a $15.0 million charge for the impairment of the investment in RealWear.
[7]	Restructuring and other includes a $5.8 million gain for the decrease in the fair value adjustment to the MiR acquisition contingent consideration, partially offset by a $3.0 million fair value adjustment to increase the AutoGuide acquisition contingent consideration, $0.5 million of employee severance charges and $0.2 million of acquisition related expenses and compensation.
[8]	Teradyne recorded pension and post retirement net actuarial losses of $7.7 million for the fourth quarter in 2019. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[9]	Restructuring and other includes a $7.8 million gain for the decrease in the fair value of MiR contingent consideration liability, partially offset by $0.8 million of employee severance charges and $0.5 million of acquisition related expenses and compensation.
[10]	Restructuring and other includes a $11.7 million gain for the decrease in the fair value of the MiR contingent consideration liability, partially offset by $0.8 million of employee severance charges and $0.5 million of acquisition related expenses and compensation.
[11]	Restructuring and other includes a $3.0 million fair value adjustment to increase the MiR acquisition contingent consideration, $1.3 million of acquisition related expenses and compensation and $0.8 million of employee severance charges.

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