Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Derivatives, Fair Value [Line Items]
Net liability position related to derivative financial instruments	$ 4
Transactions period of derivative contracts	1 year
Probability of default percentage	10.00%
Credit default recovery rate percentage	20.00%
Change in unobservable inputs percentage	10.00%
Minimum [Member]
Derivatives, Fair Value [Line Items]
Fair value of credit valuation adjustment	15.00%
Foreign currency derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Payments to settle foreign currency forward contracts	7
Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Aggregate outstanding notional amount	250
Foreign currency option contracts [Member]
Derivatives, Fair Value [Line Items]
Aggregate outstanding notional amount	207
Foreign exchange forward contracts [Member]
Derivatives, Fair Value [Line Items]
Aggregate outstanding notional amount	$ 195

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

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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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Derivative settlement amount.

+ References

No definition available.

+ Details

Name:	tvpl_DerivativeSettlementAmount
Namespace Prefix:	tvpl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair Value Inputs Credit Valuation Adjustment As A Percentage Of Derivative Contract

+ References

No definition available.

+ Details

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Namespace Prefix:	tvpl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of change in significant unobservable inputs.

+ References

No definition available.

+ Details

Name:	tvpl_PercentageOfChangeInSignificantUnobservableInputs
Namespace Prefix:	tvpl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Transactions period of derivative contracts.

+ References

No definition available.

+ Details

Name:	tvpl_TransactionsPeriodOfDerivativeContracts
Namespace Prefix:	tvpl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Estimated percentage to which the maximum potential amount of future payments under the credit derivative would be covered by the proceeds from liquidation of assets held either as collateral or by third parties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4K

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5708775-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration