Consolidated Statements Of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2009
Consolidated Statements Of Cash Flows [Abstract]
Settlement of related accounts under capital expenditures	$ 1,709

Settlement of related accounts under capital expenditure.

No definition available.

Name:	tg_SettlementOfRelatedAccountsUnderCapitalExpenditure
Namespace Prefix:	tg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration