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Computation of Basic and Diluted Net Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 31, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Income Loss Per Common Share                      
Net income for basic and diluted net income per share $ (103,811)us-gaap_NetIncomeLoss [1],[2],[3] $ 82,949us-gaap_NetIncomeLoss [1],[4] $ 101,205us-gaap_NetIncomeLoss [1] $ 929us-gaap_NetIncomeLoss $ 22,343us-gaap_NetIncomeLoss [5],[6] $ 69,459us-gaap_NetIncomeLoss $ 66,556us-gaap_NetIncomeLoss $ 6,589us-gaap_NetIncomeLoss $ 81,272us-gaap_NetIncomeLoss $ 164,947us-gaap_NetIncomeLoss $ 217,049us-gaap_NetIncomeLoss
Weighted average common shares-basic                 202,908us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 190,772us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 186,878us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares from assumed conversion of convertible notes                 5,013us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities [7] 23,341us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities [7] 22,367us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities [7]
Convertible note hedge warrant shares                 12,562us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants [8] 18,795us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants [8] 17,433us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants [8]
Employee stock purchase rights                 31us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements 36us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements 64us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements
Dilutive potential common shares                 19,642us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 44,827us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 43,368us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common shares-diluted                 222,550us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 235,599us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 230,246us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per common share-basic $ (0.48)us-gaap_EarningsPerShareBasic [1],[2],[3] $ 0.40us-gaap_EarningsPerShareBasic [1],[4] $ 0.52us-gaap_EarningsPerShareBasic [1] $ 0.00us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic [5],[6] $ 0.36us-gaap_EarningsPerShareBasic $ 0.35us-gaap_EarningsPerShareBasic $ 0.03us-gaap_EarningsPerShareBasic $ 0.40us-gaap_EarningsPerShareBasic $ 0.86us-gaap_EarningsPerShareBasic $ 1.16us-gaap_EarningsPerShareBasic
Net income per common share-diluted $ (0.48)us-gaap_EarningsPerShareDiluted [1],[2],[3] $ 0.38us-gaap_EarningsPerShareDiluted [1],[4] $ 0.47us-gaap_EarningsPerShareDiluted [1] $ 0.00us-gaap_EarningsPerShareDiluted $ 0.09us-gaap_EarningsPerShareDiluted [5],[6] $ 0.29us-gaap_EarningsPerShareDiluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.03us-gaap_EarningsPerShareDiluted $ 0.37us-gaap_EarningsPerShareDiluted $ 0.70us-gaap_EarningsPerShareDiluted $ 0.94us-gaap_EarningsPerShareDiluted
Restricted Stock Units                      
Net Income Loss Per Common Share                      
Incremental shares attributable to share based payment arrangements                 1,092us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 1,127us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 2,291us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
Stock Option                      
Net Income Loss Per Common Share                      
Incremental shares attributable to share based payment arrangements                 944us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember		 1,528us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember		 1,213us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
[1] Dividends declared by Teradyne's Board of Directors were paid in each of the second, third and fourth quarters of 2014.
[2] In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[3] In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[4] Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] Other (income) expense, net includes a $34.2 million gain from the sale of an equity investment.
[6] In the fourth quarter ended December 31, 2013, Teradyne recorded pension and post retirement net actuarial gains of $9.0 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[7] Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $5.48, multiplied by 34.7 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.
[8] Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $7.67, multiplied by 34.7 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. Teradyne's call option on its common stock (convertible note hedge transaction) was excluded from the calculation of diluted shares because the effect was anti-dilutive. See Note G: "Debt" regarding the convertible note hedge transaction.