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Quarterly Results - Impact of Certain Factors on Income (Loss) and Earning (Loss) Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Quarterly Financial Data [Abstract]
Asset Impairment Charge		$ (2,356)us-gaap_ImpairmentChargeOnReclassifiedAssets
Restructuring Costs & Workforce Efficiency	(373)us-gaap_RestructuringCosts				(60)us-gaap_RestructuringCosts	(117)us-gaap_RestructuringCosts	(193)us-gaap_RestructuringCosts	(260)us-gaap_RestructuringCosts
Alternative Fuel Mixture/Cellulosic Biofuel Credits	81glt_IncomeTaxExpenseBenefitRelatedToCellulosicBiofuelAndAlternativeFuelMixtureCredit	1,032glt_IncomeTaxExpenseBenefitRelatedToCellulosicBiofuelAndAlternativeFuelMixtureCredit			450glt_IncomeTaxExpenseBenefitRelatedToCellulosicBiofuelAndAlternativeFuelMixtureCredit	9,866glt_IncomeTaxExpenseBenefitRelatedToCellulosicBiofuelAndAlternativeFuelMixtureCredit
Gains on Sale of Plant Equipment and Timberlands	612us-gaap_GainsLossesOnSalesOfAssets	1,004us-gaap_GainsLossesOnSalesOfAssets	872us-gaap_GainsLossesOnSalesOfAssets	507us-gaap_GainsLossesOnSalesOfAssets	1,301us-gaap_GainsLossesOnSalesOfAssets	142us-gaap_GainsLossesOnSalesOfAssets		282us-gaap_GainsLossesOnSalesOfAssets
Acquisition Integration Costs	$ (487)us-gaap_DerivativeGainLossOnDerivativeNet	$ (115)us-gaap_DerivativeGainLossOnDerivativeNet			$ (194)us-gaap_DerivativeGainLossOnDerivativeNet	$ (154)us-gaap_DerivativeGainLossOnDerivativeNet	$ (3,969)us-gaap_DerivativeGainLossOnDerivativeNet	$ (1,761)us-gaap_DerivativeGainLossOnDerivativeNet

X

- Definition

The amount of tax benefit or (expense) related to cellulosic biofuel or alternative fuel mixture credits.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

Amount of gain (loss) on sale or disposal of assets utilized in financial service operations.

+ References

No definition available.

+ Details

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- Definition

For the asset that is reclassified back to held and used from held-for-sale, the amount of impairment charge that is recognized on the reclassification date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2459-110228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 35

-Paragraph 44

-URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1756-110224

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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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