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Pro Forma Results Under Acquisition (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Avionics Interface Technologies, LLC |  |  |
Business Acquisition, Pro Forma Information [Line Items] |  |  |
Revenues | $ 1,655,038 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember | $ 1,434,699 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
Net income | 82,169 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember | 164,087 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
Net income per common share, basic | $ 0.40 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember | $ 0.86 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
Net income per common share, diluted | $ 0.37 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember | $ 0.70 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
ZTEC Instruments, Inc. |  |  |
Business Acquisition, Pro Forma Information [Line Items] |  |  |
Revenues |  | 1,431,270 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember | 1,660,758 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Net income |  | $ 163,394 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember | $ 215,654 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Net income per common share, basic |  | $ 0.86 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember | $ 1.15 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Net income per common share, diluted |  | $ 0.69 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember | $ 0.94 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember

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