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Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other | $ 1,198 us-gaap_RestructuringSettlementAndImpairmentProvisions | [1],[2],[3] | $ (405)us-gaap_RestructuringSettlementAndImpairmentProvisions | [1],[4] | $ 572 us-gaap_RestructuringSettlementAndImpairmentProvisions | [1] | $ 600 us-gaap_RestructuringSettlementAndImpairmentProvisions | [5],[6] | $ 889 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 259 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 332 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 1,365 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | $ 2,080 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | $ (7,721)us-gaap_RestructuringSettlementAndImpairmentProvisions |
Goodwill impairment charge | 98,897 us-gaap_GoodwillImpairmentLoss | [1],[2],[3] |  |  |  |  |  |  |  |  |  | 98,897 us-gaap_GoodwillImpairmentLoss |  |  |  |  |
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  | (432)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember |  | (449)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember |  | (8,794)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember |
Semiconductor Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  | 14,389 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [7] | 5,218 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [7] | 18,433 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | [7]
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  | 490 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  | 1,016 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  | 386 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory step-up |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,089 ter_CostOfRevenuesInventoryStepUp / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | [8]
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  | 5,679 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 7,206 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 4,145 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  | 565 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 82 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  | 236 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  | 98,897 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  |  |  |  |
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  | 2,125 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | 4,168 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | 4,271 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  | $ 742 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | $ 1,431 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  | $ 451 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |
[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] | Included in the cost of revenues for the years ended December 31, 2014 and 2012 are charges for excess inventory provisions recorded primarily as a result of product transition.
[8] | Included in the cost of revenues for the years ended December 31, 2012 is the cost for purchase accounting inventory step-up.

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