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Contingencies (Details) (USD $) In Millions, unless otherwise specified | Jan. 08, 2013 in | Dec. 31, 2013 Tredegar vs. 3M
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Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss |  | $ 3
Minimum thickness of performance enhancing layer on films required to avoid antidumping duty order | 0.00001 |

X
- Definition Estimated legal expense expected to be incurred on contingent matter in the next 12 months. + References No definition available. + Details
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Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | instant

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