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Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2008 | Aug. 31, 2007
kaleo |  |  |  |  |  |
Total cash invested in private company |  |  |  |  | $ 7.5 us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes / dei_LegalEntityAxis = tg_KaleoMember |
Ownership interest percentage | 20.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |
Carrying value | 39.1 us-gaap_InvestmentOwnedAtFairValue / dei_LegalEntityAxis = tg_KaleoMember |  |  | 39.1 us-gaap_InvestmentOwnedAtFairValue / dei_LegalEntityAxis = tg_KaleoMember |  |
Weighted average cost of capital | 45.00%us-gaap_FairValueInputsDiscountRate / dei_LegalEntityAxis = tg_KaleoMember | 45.00%us-gaap_FairValueInputsDiscountRate / dei_LegalEntityAxis = tg_KaleoMember | 45.00%us-gaap_FairValueInputsDiscountRate / dei_LegalEntityAxis = tg_KaleoMember |  |  |
Basis point decrease of weighted average cost of capital assumption | 5.00%tg_PointDecreaseOfWeightedAverageCostOfCapitalAssumption / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |
Basis point increase of weighted average cost of capital assumption | 5.00%tg_PointIncreaseOfWeightedAverageCostOfCapitalAssumption / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |
Increase in fair value from five hundred point decrease in weighted average cost of capital assumption | 7 tg_IncreaseInFairValueFromFiveHundredPointDecreaseInWeightedAverageCostOfCapitalAssumption / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption | 5 tg_DecreaseInFairValueFromFiveHundredPointIncreaseInWeightedAverageCostOfCapitalAssumption / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |
Harbinger Fund |  |  |  |  |  |
Cost-method investment, OTTI | 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember | 0.2 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  |  |  |
Harbinger Fund |  |  |  |  |  |
Cost Method Investments | 1.8 us-gaap_CostMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  |  | 1.8 us-gaap_CostMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  |
Alleghany and Bath County, Virginia [Member] |  |  |  |  |  |
Cost Method Investments | $ 2.6 us-gaap_CostMethodInvestments / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  |  | $ 2.6 us-gaap_CostMethodInvestments / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  |

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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