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Acquisitions (Summary Of The Third-Party Debt Assumed And Not Repaid In Connection With The Close Of The Acquisitions) (Details)	0 Months Ended
	Nov. 30, 2010
Pennsylvania Industrial Development Authority Mortgage Note Due Two Thousand Eighteen Interest Rate Of Three Percentage [Member]
Business Acquisition [Line Items]
Stated interest rate	3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = gti_PennsylvaniaIndustrialDevelopmentAuthorityMortgageNoteDueTwoThousandEighteenInterestRateOfThreePercentageMember
Debt Instrument Maturity Dates	2018
Secured Promisory Note Due Two Thousand Fourteen Interest Rate Of Six Point Two Five Percent [Member]
Business Acquisition [Line Items]
Stated interest rate	6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = gti_SecuredPromisoryNoteDueTwoThousandFourteenInterestRateOfSixPointTwoFivePercentMember
Debt Instrument Maturity Dates	2014

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- Definition

Debt Instrument Maturity Dates

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-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 210.5-02.22(a)(1))

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

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