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Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Jan. 08, 2013 in
Loss Contingencies [Line Items]
Minimum thickness of performance enhancing layer on films required to avoid antidumping duty order			0.00001tg_MinimumThicknessOfPerformanceEnhancingLayerOnFilmsRequiredToAvoidAntidumpingDutyOrder
Tredegar vs. 3M [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount	$ 10us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = tg_Tredegarvs.3MMember	$ 10us-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

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Namespace Prefix:	tg_
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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

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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: