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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
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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] | $ 82,949 us-gaap_NetIncomeLoss | [1],[4] | $ 101,205 us-gaap_NetIncomeLoss | [1] | $ 929 us-gaap_NetIncomeLoss | $ 22,343 us-gaap_NetIncomeLoss | [5],[6] | $ 69,459 us-gaap_NetIncomeLoss | $ 66,556 us-gaap_NetIncomeLoss | $ 6,589 us-gaap_NetIncomeLoss | $ 81,272 us-gaap_NetIncomeLoss |  | $ 164,947 us-gaap_NetIncomeLoss |  | $ 217,049 us-gaap_NetIncomeLoss |
Weighted average common shares-basic |  |  |  |  |  |  |  |  |  |  |  |  | 202,908 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 190,772 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 186,878 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Incremental shares from assumed conversion of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  | 5,013 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | [7] | 23,341 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | [7] | 22,367 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | [7]
Convertible note hedge warrant shares |  |  |  |  |  |  |  |  |  |  |  |  | 12,562 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | [8] | 18,795 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | [8] | 17,433 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | [8]
Employee stock purchase rights |  |  |  |  |  |  |  |  |  |  |  |  | 31 us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements |  | 36 us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements |  | 64 us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements |
Dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  | 19,642 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  | 44,827 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  | 43,368 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |
Weighted average common shares-diluted |  |  |  |  |  |  |  |  |  |  |  |  | 222,550 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 235,599 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 230,246 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Net income per common share-basic | $ (0.48)us-gaap_EarningsPerShareBasic | [1],[2],[3] | $ 0.40 us-gaap_EarningsPerShareBasic | [1],[4] | $ 0.52 us-gaap_EarningsPerShareBasic | [1] | $ 0.00 us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic | [5],[6] | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.35 us-gaap_EarningsPerShareBasic | $ 0.03 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic |  | $ 0.86 us-gaap_EarningsPerShareBasic |  | $ 1.16 us-gaap_EarningsPerShareBasic |
Net income per common share-diluted | $ (0.48)us-gaap_EarningsPerShareDiluted | [1],[2],[3] | $ 0.38 us-gaap_EarningsPerShareDiluted | [1],[4] | $ 0.47 us-gaap_EarningsPerShareDiluted | [1] | $ 0.00 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | [5],[6] | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.03 us-gaap_EarningsPerShareDiluted | $ 0.37 us-gaap_EarningsPerShareDiluted |  | $ 0.70 us-gaap_EarningsPerShareDiluted |  | $ 0.94 us-gaap_EarningsPerShareDiluted |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  |  |  |  |  |  |  |  |  |  |  |  | 1,092 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 1,127 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 2,291 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember |
Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  |  |  |  |  |  |  |  |  |  |  |  | 944 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |  | 1,528 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |  | 1,213 us-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.

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