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Income Taxes - Schedule of Current and Non-Current Deferred Tax Assets and Liabilities Balance Sheet Captions (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
Prepaid expenses and other current assets | $ 20,017 glt_DeferredTaxAssetsPrepaidExpensesAndOtherCurrentAssets | $ 21,447 glt_DeferredTaxAssetsPrepaidExpensesAndOtherCurrentAssets
Other assets | 8,830 us-gaap_DeferredTaxAssetsOther | 9,197 us-gaap_DeferredTaxAssetsOther
Other current liabilities | 234 glt_DeferredTaxLiabilitiesOtherCurrentLiabilities | 12 glt_DeferredTaxLiabilitiesOtherCurrentLiabilities
Deferred income taxes | $ 104,016 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 141,020 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Deferred tax liabilities arising from liabilities reported under the balance sheet caption "other long-term liabilities". + References No definition available. + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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