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Asset Impairment Charge - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Non-cash asset impairment charge	$ 3,262us-gaap_AssetImpairmentCharges
Dresden Papier GmbH [Member] | Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Non-cash asset impairment charge		$ 3,300us-gaap_AssetImpairmentCharges / us-gaap_BusinessAcquisitionAxis = glt_DresdenPapierGmbhMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ 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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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- Details

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