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Contingencies (Details)	Sep. 30, 2017 in
3M vs. Tredegar
Loss Contingencies [Line Items]
Litigation Settlement, Amount	0.00001

X

- Definition

Nonmonetary Thickness Measurement

+ References

No definition available.

+ Details

Name:	tg_NonmonetaryThicknessMeasurement
Namespace Prefix:	tg_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ 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: