XML 73 R55.htm IDEA: XBRL DOCUMENT
v3.7.0.1

New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2016
New Accounting Pronouncements [Abstract] |  |
Effect of Adoption on Share-Based Compensation | $ 0.5 | $ 1.1

X
- Definition Effect of Adoption on Share-Based Compensation + References No definition available. + Details
Name: | tg_EffectofAdoptiononShareBasedCompensation
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition New Accounting Pronouncements [Abstract] + References No definition available. + Details
Name: | tg_NewAccountingPronouncementsAbstract
Namespace Prefix: | tg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration