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Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 28, 2014
Jun. 29, 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]                    
Restructuring and other $ 1,198us-gaap_RestructuringSettlementAndImpairmentProvisions [1],[2],[3] $ (405)us-gaap_RestructuringSettlementAndImpairmentProvisions [1],[4] $ 572us-gaap_RestructuringSettlementAndImpairmentProvisions [1] $ 600us-gaap_RestructuringSettlementAndImpairmentProvisions [5],[6] $ 889us-gaap_RestructuringSettlementAndImpairmentProvisions $ 259us-gaap_RestructuringSettlementAndImpairmentProvisions $ 332us-gaap_RestructuringSettlementAndImpairmentProvisions $ 1,365us-gaap_RestructuringSettlementAndImpairmentProvisions $ 2,080us-gaap_RestructuringSettlementAndImpairmentProvisions $ (7,721)us-gaap_RestructuringSettlementAndImpairmentProvisions
Goodwill impairment charge 98,897us-gaap_GoodwillImpairmentLoss [1],[2],[3]             98,897us-gaap_GoodwillImpairmentLoss    
Corporate And Eliminations                    
Segment Reporting Information [Line Items]                    
Restructuring and other               (432)us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 (449)us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember		 (8,794)us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember
Semiconductor Test                    
Segment Reporting Information [Line Items]                    
Cost of revenues-inventory charge               14,389ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [7] 5,218ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [7] 18,433ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 [7]
Restructuring and other               490us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 1,016us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember		 386us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember
Wireless Test                    
Segment Reporting Information [Line Items]                    
Cost of revenues-inventory step-up                   6,089ter_CostOfRevenuesInventoryStepUp
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 [8]
Cost of revenues-inventory charge               5,679ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 7,206ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 4,145ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember
Restructuring and other               565us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 82us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		 236us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember
Goodwill impairment charge               98,897us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember		    
System Test                    
Segment Reporting Information [Line Items]                    
Cost of revenues-inventory charge               2,125ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 4,168ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 4,271ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember
Restructuring and other               $ 742us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 $ 1,431us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember		 $ 451us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember
[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] Included in the cost of revenues for the years ended December 31, 2014 and 2012 are charges for excess inventory provisions recorded primarily as a result of product transition.
[8] Included in the cost of revenues for the years ended December 31, 2012 is the cost for purchase accounting inventory step-up.