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Debt (Details)	3 Months Ended
	Mar. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, covenant terms, minimum shareholders' equity	$ 320,000,000
Line of credit facility, covenant terms, percentage of shareholders' equity to net income	50.00%
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 350,000,000
Line Of Credit Facility Term	5 years

X

- Definition

Line of credit facility, covenant terms, minimum shareholders' equity.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Line of credit facility, covenant terms, percentage of shareholders' equity to net income.

+ References

No definition available.

+ Details

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Namespace Prefix:	tg_
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Balance Type:	na
Period Type:	duration

X

- Definition

Line of credit facility term.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.19(b),22(b))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	credit
Period Type:	instant

X

- Details

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