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Schedule of Reported Available for Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 1,000,625 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 855,786 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale marketable securities, Unrealized Gain | 4,818 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 3,689 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Available-for-sale marketable securities, Unrealized (Loss) | (867)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (1,515)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Available-for-sale marketable securities, Fair Market Value | 1,004,576 us-gaap_AvailableForSaleSecurities | 857,960 us-gaap_AvailableForSaleSecurities
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 583,076 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 241,760 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Marketable securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 533,833 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember | 586,818 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Available-for-sale marketable securities, Unrealized Gain | 99 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember | 85 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Available-for-sale marketable securities, Unrealized (Loss) | (145)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember | (21)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Available-for-sale marketable securities, Fair Market Value | 533,787 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember | 586,882 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 240,234 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember | 137,670 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Long-term marketable securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 466,792 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember | 268,968 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember
Available-for-sale marketable securities, Unrealized Gain | 4,719 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember | 3,604 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember
Available-for-sale marketable securities, Unrealized (Loss) | (722)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember | (1,494)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember
Available-for-sale marketable securities, Fair Market Value | 470,789 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember | 271,078 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | $ 342,842 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember | $ 104,090 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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