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Income Taxes Difference Between the Effective Tax Rate and the U.S. Federal Statutory Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense at the U.S. federal tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Foreign income tax differential	(9.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(7.30%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(8.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
State and local income taxes	0.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
U.S. permanent book/tax differences	(1.70%)tdc_EffectiveIncomeTaxRateReconciliationUSPermanentBookTaxDifferences	(1.60%)tdc_EffectiveIncomeTaxRateReconciliationUSPermanentBookTaxDifferences	(0.50%)tdc_EffectiveIncomeTaxRateReconciliationUSPermanentBookTaxDifferences
Other, net	0.90%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate	25.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations	25.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations	27.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

Effective Income Tax Rate Reconciliation, U.S. Permanent Book/Tax Differences

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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