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Supply Chain Financing (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supply Chain Financing [Abstract]
Maximum amount owing to financing party	$ 49,300,000gti_MaximumAmountOwingToFinancingParty
Supply chain financing liability	0us-gaap_OtherShortTermBorrowings	9,455,000us-gaap_OtherShortTermBorrowings
Supply Chain Financing Mark Up	$ 47,000gti_SupplyChainFinancingMarkUp	$ 451,000gti_SupplyChainFinancingMarkUp	$ 621,000gti_SupplyChainFinancingMarkUp

X

- Definition

Maximum amount owing to financing party.

+ References

No definition available.

+ Details

Name:	gti_MaximumAmountOwingToFinancingParty
Namespace Prefix:	gti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	gti_SupplyChainFinancingAbstract
Namespace Prefix:	gti_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Supply Chain Financing Mark Up

+ References

No definition available.

+ Details

Name:	gti_SupplyChainFinancingMarkUp
Namespace Prefix:	gti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Sum of the carrying amounts at the balance sheet date of short-term borrowings not otherwise specified in the taxonomy having initial terms less than one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5



Reference 2: 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(a)(7))

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

+ Details

Name:	us-gaap_OtherShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant