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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Purchase Commitment, Excluding Long-term Commitment |  |
Aggregate purchase commitments | $ 415.6 |
Purchase commitments less than one year | $ 412.9 |
Warranty period | 1 year |
Product warranty accrual | $ 9.0 | $ 7.9
Revenue deferrals related to extended warranties | $ 30.7 | $ 27.4

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- Definition Warranty period. + References No definition available. + Details
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Namespace Prefix: | ter_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) in the extended product warranty liability. Excludes standard product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=68068213&loc=d3e12565-110249 + Details
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Period Type: | duration

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- Definition Amount of increase (decrease) in the standard and extended product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant