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Acquisitions - Additional Information (Detail) (USD $)	0 Months Ended
	Oct. 31, 2014	Apr. 05, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Business acquisition, Contingent consideration discount rate	4.70%us-gaap_FairValueInputsDiscountRate
Goodwill		$ 273,438,000us-gaap_Goodwill	$ 273,438,000us-gaap_Goodwill
Avionics Interface Technologies, LLC
Business Acquisition [Line Items]
Total purchase price	21,200,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember
Cash paid to acquire outstanding common and preferred stock	19,400,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember
Contingent consideration	1,800,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember
Goodwill	10,516,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember
Avionics Interface Technologies, LLC | Maximum
Business Acquisition [Line Items]
Contingent consideration	2,100,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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-Publisher FASB

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Amount of liability recognized arising from contingent consideration in a business combination.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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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.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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