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Acquisitions - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 2 Months Ended
Oct. 31, 2014
Oct. 25, 2013
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
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]                              
Business acquisition, Contingent consideration discount rate 4.70%us-gaap_FairValueInputsDiscountRate 5.20%us-gaap_FairValueInputsDiscountRate                          
Goodwill     $ 273,438,000us-gaap_Goodwill       $ 361,792,000us-gaap_Goodwill       $ 273,438,000us-gaap_Goodwill $ 361,792,000us-gaap_Goodwill $ 349,272,000us-gaap_Goodwill $ 273,438,000us-gaap_Goodwill $ 361,792,000us-gaap_Goodwill
Total net revenues     323,236,000us-gaap_Revenues [1],[2],[3] 478,010,000us-gaap_Revenues [1],[4] 525,567,000us-gaap_Revenues [1] 321,010,000us-gaap_Revenues 285,301,000us-gaap_Revenues [5],[6] 433,376,000us-gaap_Revenues 428,889,000us-gaap_Revenues 280,367,000us-gaap_Revenues 1,647,824,000us-gaap_Revenues [7] 1,427,933,000us-gaap_Revenues [7] 1,656,750,000us-gaap_Revenues [7]    
Income (loss) from operations before taxes     (124,813,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1],[2],[3] 100,670,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1],[4] 121,392,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1] (1,873,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 35,439,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [5],[6] 87,552,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 80,357,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (1,426,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 95,376,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [8],[9] 201,922,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [8],[9] 265,976,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [8],[9]    
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		   10,516,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ter_AvionicsInterfaceTechnologiesLlcMember		               10,516,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ter_AvionicsInterfaceTechnologiesLlcMember		     10,516,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ter_AvionicsInterfaceTechnologiesLlcMember		  
Total net revenues                           600,000us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= ter_AvionicsInterfaceTechnologiesLlcMember		  
Income (loss) from operations before taxes                           (800,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ 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		                            
ZTEC Instruments, Inc.                              
Business Acquisition [Line Items]                              
Total purchase price   17,300,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember		                          
Cash paid to acquire outstanding common and preferred stock   15,100,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember		                          
Contingent consideration   2,200,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember		                          
Goodwill   12,520,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember		                          
Total net revenues                             400,000us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember
Income (loss) from operations before taxes                             (800,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember
ZTEC Instruments, Inc. | Maximum                              
Business Acquisition [Line Items]                              
Contingent consideration   5,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                          
[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.