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Subsequent Events Subsequent Events (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017 USD ($)
Terphane Holdings Llc [Member] | Scenario, Forecast [Member]
Subsequent Event [Line Items]
Businesss Combination Settlement of Escrow Account	$ 12

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- Definition

Businesss Combination Settlement of Escrow Account

+ References

No definition available.

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=tg_TerphaneHoldingsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: