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Employee Benefit Plans Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Postemployment
Discount rate	3.50%tdc_PostemploymentBenefitAssumptionsUsedCalculatingBenefitObligationDiscountRate	3.80%tdc_PostemploymentBenefitAssumptionsUsedCalculatingBenefitObligationDiscountRate
Rate of compensation increase	3.00%tdc_PostemploymentBenefitAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncrease	3.70%tdc_PostemploymentBenefitAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncrease
Involuntary turnover rate	1.30%tdc_PostemploymentBenefitAssumptionsUsedCalculatingBenefitObligationInvoluntaryTurnoverRate	1.00%tdc_PostemploymentBenefitAssumptionsUsedCalculatingBenefitObligationInvoluntaryTurnoverRate
Discount rate	3.80%tdc_PostemploymentBenefitAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	3.40%tdc_PostemploymentBenefitAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	4.10%tdc_PostemploymentBenefitAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Rate of compensation increase	3.70%tdc_PostemploymentBenefitAssumptionsUsedCalculatingNetPeriodicBenefitCostRateofCompensationIncrease	3.80%tdc_PostemploymentBenefitAssumptionsUsedCalculatingNetPeriodicBenefitCostRateofCompensationIncrease	3.70%tdc_PostemploymentBenefitAssumptionsUsedCalculatingNetPeriodicBenefitCostRateofCompensationIncrease
Involuntary turnover rate	1.00%tdc_PostemploymentBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInvoluntaryTurnoverRate	1.00%tdc_PostemploymentBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInvoluntaryTurnoverRate	1.50%tdc_PostemploymentBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInvoluntaryTurnoverRate
Foreign Pension Plan
Pension Benefit
Discount rate	2.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember	3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember
Rate of compensation increase	3.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember	3.20%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember
Discount rate	3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember	3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember	3.70%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember
Rate of compensation increase	3.20%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember	3.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember	3.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember
Expected return on plan assets	3.40%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember	3.40%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember	4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember

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- Definition

Postemployment Benefit, Assumptions Used Calculating Benefit Obligation, Discount Rate

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Postemployment Benefit, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

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Expected rate of compensation increases (for pay-related plans).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

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The interest rate used to adjust for the time value of money.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

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Expected rate of compensation increases (for pay-related plans).

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-Name Accounting Standards Codification

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