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Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Jan. 08, 2013 in
Loss Contingencies [Line Items] |  |
Minimum thickness of performance enhancing layer on films required to avoid antidumping duty order |  | 0.00001 tg_MinimumThicknessOfPerformanceEnhancingLayerOnFilmsRequiredToAvoidAntidumpingDutyOrder
3M vs. Tredegar |  |
Loss Contingencies [Line Items] |  |
Litigation Settlement, Amount | $ 10 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = tg_Tredegarvs.3MMember |

X
- Definition Minimum thickness of performance enhancing layer on films required to avoid antidumping duty order. + References No definition available. + Details
Name: | tg_MinimumThicknessOfPerformanceEnhancingLayerOnFilmsRequiredToAvoidAntidumpingDutyOrder
Namespace Prefix: | tg_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LitigationCaseAxis=tg_Tredegarvs.3MMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |