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Employee Benefit Plans Weighted Average Asset Allocations by Asset Category (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation As of December 31	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Target Asset Allocation	100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Equity securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation As of December 31	32.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember	34.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember
Target Asset Allocation	31.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember
Debt securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation As of December 31	41.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember	37.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember
Target Asset Allocation	44.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember
Insurance (annuity) contracts
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation As of December 31	17.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tdc_InsuranceContractMember	13.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tdc_InsuranceContractMember
Target Asset Allocation	17.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tdc_InsuranceContractMember
Real estate
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation As of December 31	5.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember	6.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember
Target Asset Allocation	3.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember
Other
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation As of December 31	5.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tdc_OtherAssetMember	10.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tdc_OtherAssetMember
Target Asset Allocation	5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tdc_OtherAssetMember

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

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