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Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Retained Earnings | Trust For Savings Restoration Plan | Foreign Currency Translation | Gain (Loss) On Derivative Financial Instruments | Pension and other post-retirement benefit adjustments
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 396,907 us-gaap_StockholdersEquity | $ 14,357 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 463,278 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (1,343)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember | $ 11,693 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | $ (406)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | $ (90,672)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Balance, shares at Dec. 31, 2011 |  | 32,057,281 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 28,251 us-gaap_NetIncomeLoss |  | 28,251 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Foreign currency translation adjustment | (11,562)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  | (11,562)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Derivative financial instruments adjustment | 1,399 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  |  |  | 1,399 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Net gains (losses) and prior service costs | (19,285)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  |  |  |  |  | (19,285)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Amortization of prior service costs and net gains or losses | 6,486 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax |  |  |  |  |  | 6,486 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Cash dividends declared | (30,782)us-gaap_DividendsCommonStockCash |  | (30,782)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  | 78,299 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Share Based Compensation Expense, Value | 2,516 tg_ShareBasedCompensationExpenseValue | 2,516 tg_ShareBasedCompensationExpenseValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issued upon exercise of stock options & other | 2,031 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions | 2,031 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issued upon exercise of stock options (including related income tax benefits) & other, shares |  | 143,366 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares received from the sale of Falling Springs, LLC | 3,709 tg_StockReceivedInDivestitureOfBusinessValue | 3,709 tg_StockReceivedInDivestitureOfBusinessValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares received from the sale of Falling Springs, LLC, shares |  | 209,576 tg_StockReceivedInDivestitureOfBusinessShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Tredegar common stock purchased by trust for savings restoration plan | 0 tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan |  | 58 tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (58)tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember |  |  |
Balance at Dec. 31, 2012 | 372,252 us-gaap_StockholdersEquity | 15,195 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 460,805 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,401)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember | 131 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 993 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (103,471)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Balance, shares at Dec. 31, 2012 |  | 32,069,370 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 21,947 us-gaap_NetIncomeLoss |  | 21,947 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Foreign currency translation adjustment | (19,336)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  | (19,336)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Derivative financial instruments adjustment | (228)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  |  |  | (228)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Net gains (losses) and prior service costs | 22,203 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  |  |  |  |  | 22,203 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Amortization of prior service costs and net gains or losses | 9,420 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax |  |  |  |  |  | 9,420 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Cash dividends declared | (9,040)us-gaap_DividendsCommonStockCash |  | (9,040)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  | 72,125 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Share Based Compensation Expense, Value | 2,572 tg_ShareBasedCompensationExpenseValue | 2,572 tg_ShareBasedCompensationExpenseValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issued upon exercise of stock options & other | 2,874 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions | 2,874 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issued upon exercise of stock options (including related income tax benefits) & other, shares |  | 163,650 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Tredegar common stock purchased by trust for savings restoration plan | 0 tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan |  | 17 tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (17)tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember |  |  |
Balance at Dec. 31, 2013 | 402,664 us-gaap_StockholdersEquity | 20,641 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 473,729 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,418)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember | (19,205)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 765 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (71,848)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Balance, shares at Dec. 31, 2013 |  | 32,305,145 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 36,879 us-gaap_NetIncomeLoss |  | 36,879 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Foreign currency translation adjustment | (28,065)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  | (28,065)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Derivative financial instruments adjustment | (109)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  |  |  | (109)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Net gains (losses) and prior service costs | (38,730)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  |  |  |  |  | (38,730)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Amortization of prior service costs and net gains or losses | 6,997 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax |  |  |  |  |  | 6,997 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Cash dividends declared | (11,007)us-gaap_DividendsCommonStockCash |  | (11,007)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  | 85,129 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Share Based Compensation Expense, Value | 3,224 tg_ShareBasedCompensationExpenseValue | 3,224 tg_ShareBasedCompensationExpenseValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shareholder Rights Agreement Redemption | (323)tg_ShareholderRightsAgreementRedemption |  | (323)tg_ShareholderRightsAgreementRedemption / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Issued upon exercise of stock options & other | 499 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions | 499 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issued upon exercise of stock options (including related income tax benefits) & other, shares |  | 31,808 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Tredegar common stock purchased by trust for savings restoration plan | 0 tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan |  | 22 tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (22)tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember |  |  |
Balance at Dec. 31, 2014 | $ 372,029 us-gaap_StockholdersEquity | $ 24,364 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 499,300 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (1,440)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember | $ (47,270)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | $ 656 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | $ (103,581)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Balance, shares at Dec. 31, 2014 |  | 32,422,082 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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