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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Retained Earnings
Balance, at Dec. 31, 2011 $ 1,505,060us-gaap_StockholdersEquity $ 22,948us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 1,293,130us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 4,746us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ 184,236us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, Shares at Dec. 31, 2011   183,587us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares)   4,321ter_SharesOfStockIssuedDuringPeriodShareBasedCompensationNetOfSharesWithheldForTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax 6,894ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes 540ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 6,354ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Stock-based compensation expense 39,920us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   39,920us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Tax benefit related to stock options and restricted stock units 8,358us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation   8,358us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Net income 217,049us-gaap_NetIncomeLoss       217,049us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Unrealized loss (gain) on marketable securities:          
Unrealized gain (loss) on marketable securities, net of tax of $370 in 2012, $216 in 2013 and $1,449 in 2014 2,009us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax     2,009us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Less: reclassification adjustment for gains included in net income, net of tax of $(201) in 2012, $(257) in 2013 and $(645) in 2014 (702)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax     (702)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Amortization of prior service benefit, net of tax of $(134) in 2012, $(159) in 2013 and $(169)in 2014 (233)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1]     (233)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Balance, at Dec. 31, 2012 1,778,355us-gaap_StockholdersEquity 23,488us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 1,347,762us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 5,820us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 401,285us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, Shares at Dec. 31, 2012   187,908us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares)   3,823ter_SharesOfStockIssuedDuringPeriodShareBasedCompensationNetOfSharesWithheldForTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax 5,404ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes 478ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 4,926ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Stock-based compensation expense 35,612us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   35,612us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Tax benefit related to stock options and restricted stock units 2,596us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation   2,596us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Net income 164,947us-gaap_NetIncomeLoss       164,947us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Unrealized loss (gain) on marketable securities:          
Unrealized gain (loss) on marketable securities, net of tax of $370 in 2012, $216 in 2013 and $1,449 in 2014 (1,097)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax     (1,097)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Less: reclassification adjustment for gains included in net income, net of tax of $(201) in 2012, $(257) in 2013 and $(645) in 2014 (447)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax     (447)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Amortization of prior service benefit, net of tax of $(134) in 2012, $(159) in 2013 and $(169)in 2014 (276)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1]     (276)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Balance, at Dec. 31, 2013 1,985,094us-gaap_StockholdersEquity 23,966us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 1,390,896us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 4,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 566,232us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, Shares at Dec. 31, 2013   191,731us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares)   3,661ter_SharesOfStockIssuedDuringPeriodShareBasedCompensationNetOfSharesWithheldForTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax 9,273ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes 458ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 8,815ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Warrant settlement   2,653us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (2,653)us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Warrant settlement Shares   21,221ter_AdjustmentsToAdditionalPaidInCapitalWarrantIssuedShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Stock-based compensation expense 39,868us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   39,868us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Tax benefit related to stock options and restricted stock units 209us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation   209us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Cash dividends (37,425)us-gaap_DividendsCash       (37,425)us-gaap_DividendsCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Net income 81,272us-gaap_NetIncomeLoss       81,272us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Unrealized loss (gain) on marketable securities:          
Unrealized gain (loss) on marketable securities, net of tax of $370 in 2012, $216 in 2013 and $1,449 in 2014 2,417us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax     2,417us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Less: reclassification adjustment for gains included in net income, net of tax of $(201) in 2012, $(257) in 2013 and $(645) in 2014 (1,433)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax     (1,433)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Amortization of prior service benefit, net of tax of $(134) in 2012, $(159) in 2013 and $(169)in 2014 (295)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1]     (295)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Balance, at Dec. 31, 2014 $ 2,078,980us-gaap_StockholdersEquity $ 27,077us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 1,437,135us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 4,689us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ 610,079us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, Shares at Dec. 31, 2014   216,613us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
[1] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note M: "Retirement Plans."