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Allocation of Purchase Price (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 31, 2014 | Oct. 25, 2013
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 273,438 us-gaap_Goodwill | $ 361,792 us-gaap_Goodwill | $ 349,272 us-gaap_Goodwill |  |
Avionics Interface Technologies, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | 10,516 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |  |  | 10,516 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
Intangible assets | 9,100 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |  |  | 9,080 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
Other current assets |  |  |  | 2,452 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
Non-current assets |  |  |  | 359 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
Accounts payable and current liabilities |  |  |  | (1,164)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
Total purchase price |  |  |  | 21,243 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
ZTEC Instruments, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | 12,520 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Intangible assets |  | 4,900 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember |  |  | 4,870 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Cash, cash equivalents and short term marketable securities |  |  |  |  | 79 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Other current assets |  |  |  |  | 1,612 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Non-current assets |  |  |  |  | 1,757 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Accounts payable and current liabilities |  |  |  |  | (1,811)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Long-term deferred tax liabilities |  |  |  |  | (1,719)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Total purchase price |  |  |  |  | $ 17,308 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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