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Asset Retirement Obligation - Schedule of Consolidated Balance Sheets where Asset Retirement Obligations Recorded (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asset retirement obligations	$ 4,114us-gaap_AssetRetirementObligation	$ 5,032us-gaap_AssetRetirementObligation	$ 8,882us-gaap_AssetRetirementObligation
Other Current Liabilities [Member]
Asset retirement obligations	2,855us-gaap_AssetRetirementObligation / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember	915us-gaap_AssetRetirementObligation / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember
Other Long-Term Liabilities [Member]
Asset retirement obligations	$ 1,259us-gaap_AssetRetirementObligation / us-gaap_BalanceSheetLocationAxis = glt_OtherLongTermLiabilitiesMember	$ 4,117us-gaap_AssetRetirementObligation / us-gaap_BalanceSheetLocationAxis = glt_OtherLongTermLiabilitiesMember

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

-URI http://asc.fasb.org/extlink&oid=6505190

+ Details

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- Details

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