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Schedule of Segment Information (Detail) (USD $) In Thousands, 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 323,236 us-gaap_Revenues | [1],[2],[3] | $ 478,010 us-gaap_Revenues | [1],[4] | $ 525,567 us-gaap_Revenues | [1] | $ 321,010 us-gaap_Revenues | $ 285,301 us-gaap_Revenues | [5],[6] | $ 433,376 us-gaap_Revenues | $ 428,889 us-gaap_Revenues | $ 280,367 us-gaap_Revenues | $ 1,647,824 us-gaap_Revenues | [7] | $ 1,427,933 us-gaap_Revenues | [7] | $ 1,656,750 us-gaap_Revenues | [7]
Income (Loss) before taxes | (124,813)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [1],[2],[3] | 100,670 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [1],[4] | 121,392 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [1] | (1,873)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 35,439 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [5],[6] | 87,552 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 80,357 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (1,426)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 95,376 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [8],[9] | 201,922 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [8],[9] | 265,976 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [8],[9]
Total assets | 2,538,520 us-gaap_Assets | [10] |  |  |  |  |  | 2,629,824 us-gaap_Assets | [10] |  |  |  | 2,538,520 us-gaap_Assets | [10] | 2,629,824 us-gaap_Assets | [10] | 2,429,345 us-gaap_Assets | [10]
Property additions |  |  |  |  |  |  |  |  |  |  |  |  | 168,982 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | 106,731 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | 119,080 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 152,544 us-gaap_DepreciationDepletionAndAmortization |  | 150,687 us-gaap_DepreciationDepletionAndAmortization |  | 145,514 us-gaap_DepreciationDepletionAndAmortization |
Semiconductor Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,790 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  | 1,023,041 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  | 1,127,726 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |
Income (Loss) before taxes |  |  |  |  |  |  |  |  |  |  |  |  | 255,803 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [8],[9] | 153,797 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [8],[9] | 185,985 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [8],[9]
Total assets | 580,501 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [10] |  |  |  |  |  | 632,840 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [10] |  |  |  | 580,501 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [10] | 632,840 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [10] | 604,127 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [10]
Property additions |  |  |  |  |  |  |  |  |  |  |  |  | 159,783 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  | 94,303 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  | 105,074 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 84,990 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  | 72,472 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  | 73,537 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 162,499 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | 153,021 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | 242,669 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |
Income (Loss) before taxes |  |  |  |  |  |  |  |  |  |  |  |  | 12,116 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | [8],[9] | 3,115 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | [8],[9] | 34,164 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | [8],[9]
Total assets | 95,105 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | [10] |  |  |  |  |  | 79,983 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | [10] |  |  |  | 95,105 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | [10] | 79,983 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | [10] | 71,116 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | [10]
Property additions |  |  |  |  |  |  |  |  |  |  |  |  | 5,469 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | 7,070 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | 6,398 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 5,399 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | 5,180 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | 4,549 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 184,535 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 251,871 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 286,355 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |
Income (Loss) before taxes |  |  |  |  |  |  |  |  |  |  |  |  | (116,196)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | [8],[9] | 23,153 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | [8],[9] | 83,077 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | [8],[9]
Total assets | 478,974 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | [10] |  |  |  |  |  | 645,001 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | [10] |  |  |  | 478,974 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | [10] | 645,001 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | [10] | 672,048 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | [10]
Property additions |  |  |  |  |  |  |  |  |  |  |  |  | 3,730 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 5,358 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 7,608 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 53,308 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 51,675 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 50,362 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) before taxes |  |  |  |  |  |  |  |  |  |  |  |  | (56,347)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember | [8],[9] | 21,857 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember | [8],[9] | (37,250)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember | [8],[9]
Total assets | 1,383,940 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember | [10] |  |  |  |  |  | 1,272,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember | [10] |  |  |  | 1,383,940 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember | [10] | 1,272,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember | [10] | 1,082,054 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember | [10]
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,847 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember |  | $ 21,360 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember |  | $ 17,066 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember |
[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] | Revenues attributable to a country are based on location of customer site.
[8] | Interest income, interest expense, other (income) expense, net and pension and postretirement plans actuarial gains and losses are included in Corporate and Eliminations.
[9] | Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and goodwill impairment charges.
[10] | Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

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