Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Line Items]
Effective tax rate for continuing operations	28.00%	19.90%
Valuation allowance	$ 1.3
Possible additional tax payments	$ 12
Terphane Ltda [Member]
Income Taxes [Line Items]
Current effective tax rate	15.25%
Income tax rate	6.25%
Percentage of social contribution on income included in current effective tax rate	9.00%
Brazil [Member]
Income Taxes [Line Items]
Federal statutory income tax rate	34.00%
Income tax rate	25.00%
Percentage of social contribution on income included in federal statutory income tax rate	9.00%

Current Effective Tax Rate Excluding Social Contribution On Income

No definition available.

Name:	tg_CurrentEffectiveTaxRateExcludingSocialContributionOnIncome
Namespace Prefix:	tg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Current Effective Tax Rate Including Social Contribution On Income

+ References

No definition available.

+ Details

Name:	tg_CurrentEffectiveTaxRateIncludingSocialContributionOnIncome
Namespace Prefix:	tg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Current Effective Tax Rate Reconciliation Social Contribution On Income

+ References

No definition available.

+ Details

Name:	tg_CurrentEffectiveTaxRateReconciliationSocialContributionOnIncome
Namespace Prefix:	tg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income

+ References

No definition available.

+ Details

Name:	tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateExcludingSocialContributionOnIncome
Namespace Prefix:	tg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Including Social Contribution On Income

+ References

No definition available.

+ Details

Name:	tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateIncludingSocialContributionOnIncome
Namespace Prefix:	tg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective income tax rate reconciliation social contribution on income.

+ References

No definition available.

+ Details

Name:	tg_EffectiveIncomeTaxRateReconciliationSocialContributionOnIncome
Namespace Prefix:	tg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	tg_IncomeTaxesLineItems
Namespace Prefix:	tg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Recognition of additional valuation allowance.

+ References

No definition available.

+ Details

Name:	tg_RecognitionOfAdditionalValuationAllowance
Namespace Prefix:	tg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 2

-Article 4

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 47

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(2))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

+ Details

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

- Definition

The estimated range of reasonably possible losses resulting from an adverse position taken by a taxing authority.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 14

-Paragraph 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)(3)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

+ Details

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