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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Purchase Commitment, Excluding Long-term Commitment |  |  |
Aggregate purchase commitments | $ 151.5 ter_AggregatePurchaseCommitments |  |
Rental expense under lease commitments | 16.0 us-gaap_OperatingLeasesRentExpenseNet | 16.5 us-gaap_OperatingLeasesRentExpenseNet | 15.5 us-gaap_OperatingLeasesRentExpenseNet
Purchase commitments maximum period | 1 year |  |
Product warranty accrual | 8.9 us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease | 6.7 us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease |
Revenue deferrals related to extended warranties | $ 43.3 us-gaap_ExtendedProductWarrantyAccrualPeriodIncreaseDecrease | $ 34.9 us-gaap_ExtendedProductWarrantyAccrualPeriodIncreaseDecrease |

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- Definition Aggregate purchase commitments. + References No definition available. + Details
Name: | ter_AggregatePurchaseCommitments
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total increases or decreases in the extended product warranty liability for the period. Does not include increases or decreases in the standard warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
Name: | us-gaap_ExtendedProductWarrantyAccrualPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total increases or decreases in the standard and extended product warranty liability during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
Name: | us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration