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Schedule of Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 31, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                      
Revenues $ 323,236us-gaap_Revenues [1],[2],[3] $ 478,010us-gaap_Revenues [1],[4] $ 525,567us-gaap_Revenues [1] $ 321,010us-gaap_Revenues $ 285,301us-gaap_Revenues [5],[6] $ 433,376us-gaap_Revenues $ 428,889us-gaap_Revenues $ 280,367us-gaap_Revenues $ 1,647,824us-gaap_Revenues [7] $ 1,427,933us-gaap_Revenues [7] $ 1,656,750us-gaap_Revenues [7]
Income (Loss) before taxes (124,813)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1],[2],[3] 100,670us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1],[4] 121,392us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1] (1,873)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 35,439us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [5],[6] 87,552us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 80,357us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (1,426)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 95,376us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [8],[9] 201,922us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [8],[9] 265,976us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [8],[9]
Total assets 2,538,520us-gaap_Assets [10]       2,629,824us-gaap_Assets [10]       2,538,520us-gaap_Assets [10] 2,629,824us-gaap_Assets [10] 2,429,345us-gaap_Assets [10]
Property additions                 168,982us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 106,731us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 119,080us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Depreciation and amortization expense                 152,544us-gaap_DepreciationDepletionAndAmortization 150,687us-gaap_DepreciationDepletionAndAmortization 145,514us-gaap_DepreciationDepletionAndAmortization
Semiconductor Test                      
Segment Reporting Information [Line Items]                      
Revenues                 1,300,790us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 1,023,041us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 1,127,726us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember
Income (Loss) before taxes                 255,803us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [8],[9] 153,797us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [8],[9] 185,985us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [8],[9]
Total assets 580,501us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [10]       632,840us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [10]       580,501us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [10] 632,840us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [10] 604,127us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [10]
Property additions                 159,783us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 94,303us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 105,074us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember
Depreciation and amortization expense                 84,990us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 72,472us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 73,537us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember
System Test                      
Segment Reporting Information [Line Items]                      
Revenues                 162,499us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 153,021us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 242,669us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember
Income (Loss) before taxes                 12,116us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 [8],[9] 3,115us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 [8],[9] 34,164us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 [8],[9]
Total assets 95,105us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 [10]       79,983us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 [10]       95,105us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 [10] 79,983us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 [10] 71,116us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 [10]
Property additions                 5,469us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 7,070us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 6,398us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember
Depreciation and amortization expense                 5,399us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 5,180us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 4,549us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember
Wireless Test                      
Segment Reporting Information [Line Items]                      
Revenues                 184,535us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 251,871us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 286,355us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember
Income (Loss) before taxes                 (116,196)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 [8],[9] 23,153us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 [8],[9] 83,077us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 [8],[9]
Total assets 478,974us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 [10]       645,001us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 [10]       478,974us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 [10] 645,001us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 [10] 672,048us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 [10]
Property additions                 3,730us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 5,358us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 7,608us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember
Depreciation and amortization expense                 53,308us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 51,675us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 50,362us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember
Corporate And Eliminations                      
Segment Reporting Information [Line Items]                      
Income (Loss) before taxes                 (56,347)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 [8],[9] 21,857us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 [8],[9] (37,250)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 [8],[9]
Total assets 1,383,940us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 [10]       1,272,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 [10]       1,383,940us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 [10] 1,272,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 [10] 1,082,054us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 [10]
Depreciation and amortization expense                 $ 8,847us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 $ 21,360us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 $ 17,066us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember
[1] Dividends declared by Teradyne's Board of Directors were paid in each of the second, third and fourth quarters of 2014.
[2] In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[3] In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[4] Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] Other (income) expense, net includes a $34.2 million gain from the sale of an equity investment.
[6] In the fourth quarter ended December 31, 2013, Teradyne recorded pension and post retirement net actuarial gains of $9.0 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[7] Revenues attributable to a country are based on location of customer site.
[8] Interest income, interest expense, other (income) expense, net and pension and postretirement plans actuarial gains and losses are included in Corporate and Eliminations.
[9] Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and goodwill impairment charges.
[10] Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.