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Derivative Instruments and Hedging Activities - Schedule of Foreign Exchange Contracts (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative
Net contract notional amount of foreign exchange forward contracts	$ 17tdc_NotionalAmountOfForeignCurrencyFairValueHedgeDerivativesNetBasis	$ 24tdc_NotionalAmountOfForeignCurrencyFairValueHedgeDerivativesNetBasis
Foreign Exchange Contract
Derivative
Contract notional amount of foreign exchange forward contracts	$ 116invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	$ 152invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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X

- Definition

Notional Amount Of Foreign Currency Fair Value Hedge Derivatives Net Basis

+ References

No definition available.

+ Details

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- Details

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- Details

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