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v2.4.1.9

Changes in Carrying Amount of Goodwill by Reporting Units (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Oct. 25, 2013 | Oct. 31, 2014
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 770,515 us-gaap_GoodwillGross | $ 757,995 us-gaap_GoodwillGross | $ 781,058 us-gaap_GoodwillGross |  |
Accumulated impairment losses | (408,723)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (408,723)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (507,620)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |
Goodwill | 361,792 us-gaap_Goodwill | 349,272 us-gaap_Goodwill | 273,438 us-gaap_Goodwill |  |
ZTEC Instruments, Inc. |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  |  | 12,520 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember |
Adjustment | 27 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember |  |  |  |
Acquisition |  | 12,520 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember |  |  |
Avionics Interface Technologies, LLC |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | 10,516 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |  | 10,516 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember
Acquisition | 10,516 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |  |  |  |
Semiconductor Test |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 260,540 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | 260,540 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | 260,540 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  |
Accumulated impairment losses | (260,540)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | (260,540)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | (260,540)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |  |
System Test |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 148,183 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | 148,183 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | 158,699 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  |
Accumulated impairment losses | (148,183)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | (148,183)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | (148,183)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  |
Goodwill |  |  | 10,516 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  |
System Test | Avionics Interface Technologies, LLC |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquisition | 10,516 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |  |  |  |
Wireless Test |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 361,792 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | 349,272 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | 361,819 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  |
Accumulated impairment losses |  |  | (98,897)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  |
Goodwill | 361,792 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | 349,272 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | 262,922 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  |
Wireless Test | ZTEC Instruments, Inc. |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Adjustment | 27 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  |  |  |
Acquisition |  | $ 12,520 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |  |  |

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