Debt - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		12 Months Ended
	Dec. 12, 2016	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Oct. 05, 2022	Jan. 01, 2022	May 01, 2020
Debt Instrument
Repurchase of common stock		$ 397,241	$ 752,082	$ 600,000
Line of Credit Facility, Maximum Borrowing Capacity					$ 750,000		$ 400,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases		$ 200,000
Line of Credit Facility, Interest Rate Description		The interest rate applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from 0.00% to 0.75% per annum or SOFR plus a margin ranging from 1.10% to 1.85% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio.
Term of revolving credit facility							3 years
Available Incremental Amount Under The Credit Facility Not To Exceed Percentage Of Consolidated EBIDTA		15.00%
Convertible common shares		$ 50,200
Current debt, Conversion		0	50,115
Deferred Tax Assets, Other		953	2,520
Retained Earnings (Accumulated Deficit)		706,514	$ 725,729
Convertible Common Shares [Member]
Debt Instrument
Stock Issued During Period, Value, Stock Options Exercised		$ 1,100
Collateral Pledged [Member]
Debt Instrument
Line of Credit Facility, Interest Rate Description		65
1.25% Convertible Senior Unsecured Notes
Debt Instrument
Aggregate principal amount	$ 460,000	$ 460,000
Debt instrument, interest rate, stated percentage	1.25%
Debt instrument, net proceeds after issuance costs	$ 450,800
Payment for net cost of convertible note hedges net of warrant proceeds	33,000	$ 33,000
Repurchase of common stock	$ 50,100
Repurchase of stock, shares	2.0
Senior notes maturity date	Dec. 15, 2023
Debt instrument, frequency of periodic payment	payable semiannually in arrears on June 15 and December 15 of each year
Shares that would be issued upon conversion		14.7
Strike price per share of warrant		$ 39.4
Debt instrument, convertible, carrying amount of equity component		$ 100,800
Maximum | 1.25% Convertible Senior Unsecured Notes
Debt Instrument
Warrant transactions expiry date		Jul. 10, 2024
Minimum | 1.25% Convertible Senior Unsecured Notes
Debt Instrument
Warrant transactions expiry date		Mar. 18, 2024
Revolving Credit Facility | Maximum | Truist Bank [Member]
Debt Instrument
Commitment fee percentage of unused portion of credit facility		0.25%
Revolving Credit Facility | Minimum | Truist Bank [Member]
Debt Instrument
Commitment fee percentage of unused portion of credit facility		0.15%
Revolving Credit Facility | Base Rate | Maximum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate		0.75%
Revolving Credit Facility | Base Rate | Minimum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate		0.00%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate		1.85%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate		1.10%
Teradyne [Member]
Debt Instrument
Mezzanine equity						$ 100,800
Current debt, Conversion						1,400
Debt						6,600
Retained Earnings (Accumulated Deficit)						94,600
Teradyne [Member] | Accounting Standards Update 2020-06 [Member]
Debt Instrument
Deferred Tax Assets, Other						1,800
Teradyne [Member] | Accounting Standards Update 2020-06 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Debt Instrument
Mezzanine equity						$ 0