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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
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Asset retirement obligations | $ 4,114 us-gaap_AssetRetirementObligation | $ 5,032 us-gaap_AssetRetirementObligation | $ 8,882 us-gaap_AssetRetirementObligation
Other Current Liabilities [Member] |  |  |
Asset retirement obligations | 2,855 us-gaap_AssetRetirementObligation / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember | 915 us-gaap_AssetRetirementObligation / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember |
Other Long-Term Liabilities [Member] |  |  |
Asset retirement obligations | $ 1,259 us-gaap_AssetRetirementObligation / us-gaap_BalanceSheetLocationAxis = glt_OtherLongTermLiabilitiesMember | $ 4,117 us-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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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