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v2.4.1.9

Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Condensed Income Statements, Captions [Line Items] |  |
Net sales | $ 417,469 us-gaap_SalesRevenueGoodsNet | $ 455,721 us-gaap_SalesRevenueGoodsNet
Energy and related sales, net | 2,068 glt_EnergyAndRelatedSalesNet | 5,262 glt_EnergyAndRelatedSalesNet
Total revenues | 419,537 us-gaap_SalesRevenueNet | 460,983 us-gaap_SalesRevenueNet
Costs of products sold | 367,429 us-gaap_CostOfGoodsSold | 405,943 us-gaap_CostOfGoodsSold
Gross profit | 52,108 us-gaap_GrossProfit | 55,040 us-gaap_GrossProfit
Selling, general and administrative expenses | 31,272 us-gaap_SellingGeneralAndAdministrativeExpense | 33,551 us-gaap_SellingGeneralAndAdministrativeExpense
Gains on dispositions of plant, equipment and timberlands, net | (2,654)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | (809)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Operating income | 23,490 us-gaap_OperatingIncomeLoss | 22,298 us-gaap_OperatingIncomeLoss
Other non-operating income (expense) |  |
Interest expense | (4,508)us-gaap_InterestExpense | (4,812)us-gaap_InterestExpense
Interest income | 65 us-gaap_InvestmentIncomeInterest | 61 us-gaap_InvestmentIncomeInterest
Other, net | (187)us-gaap_OtherNonoperatingIncomeExpense | 211 us-gaap_OtherNonoperatingIncomeExpense
Total non-operating expense | (4,630)us-gaap_NonoperatingIncomeExpense | (4,540)us-gaap_NonoperatingIncomeExpense
Income before income taxes | 18,860 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 17,758 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision | 4,935 us-gaap_IncomeTaxExpenseBenefit | 3,110 us-gaap_IncomeTaxExpenseBenefit
Net income | 13,925 us-gaap_NetIncomeLoss | 14,648 us-gaap_NetIncomeLoss
Other comprehensive income (loss) | (35,285)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 2,965 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income | (21,360)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 17,613 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Adjustments/ Eliminations [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales |  | (18)us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Total revenues |  | (18)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Costs of products sold |  | (18)us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Other non-operating income (expense) |  |
Interest expense | 6,703 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 2,658 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Interest income | (6,702)us-gaap_InvestmentIncomeInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (2,658)us-gaap_InvestmentIncomeInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Equity in earnings of subsidiaries | (25,838)us-gaap_TemporaryEquityInterestInSubsidiaryEarnings / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (42,961)us-gaap_TemporaryEquityInterestInSubsidiaryEarnings / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Other, net | (1)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |
Total non-operating expense | (25,838)us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (42,961)us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Income before income taxes | (25,838)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (42,961)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Net income | (25,838)us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (42,961)us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Other comprehensive income (loss) | (298)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (886)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income | (26,136)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (43,847)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Parent Company [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 219,876 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 225,831 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Energy and related sales, net | 2,068 glt_EnergyAndRelatedSalesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,262 glt_EnergyAndRelatedSalesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total revenues | 221,944 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 231,093 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Costs of products sold | 202,519 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 216,716 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gross profit | 19,425 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,377 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Selling, general and administrative expenses | 17,182 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,793 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gains on dispositions of plant, equipment and timberlands, net | (1,471)us-gaap_GainLossOnSaleOfPropertyPlantEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (812)us-gaap_GainLossOnSaleOfPropertyPlantEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income | 3,714 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,604)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other non-operating income (expense) |  |
Interest expense | (4,817)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,739)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income | 163 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 153 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in earnings of subsidiaries | 16,363 us-gaap_TemporaryEquityInterestInSubsidiaryEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22,499 us-gaap_TemporaryEquityInterestInSubsidiaryEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other, net | (715)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (881)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total non-operating expense | 10,994 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,032 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income taxes | 14,708 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,428 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax provision | 783 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (220)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income | 13,925 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,648 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other comprehensive income (loss) | (35,285)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,965 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income | (21,360)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,613 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Guarantors [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales |  | 18 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Total revenues |  | 18 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Costs of products sold |  | 17 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Gross profit |  | 1 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Selling, general and administrative expenses | 190 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 13 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Gains on dispositions of plant, equipment and timberlands, net | (1,183)us-gaap_GainLossOnSaleOfPropertyPlantEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Operating income | 993 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (12)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other non-operating income (expense) |  |
Interest income | 6,599 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2,559 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Equity in earnings of subsidiaries | 9,475 us-gaap_TemporaryEquityInterestInSubsidiaryEarnings / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 20,462 us-gaap_TemporaryEquityInterestInSubsidiaryEarnings / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other, net | (126)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 10 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Total non-operating expense | 15,948 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 23,031 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Income before income taxes | 16,941 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 23,019 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Income tax provision | 904 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 913 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net income | 16,037 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 22,106 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other comprehensive income (loss) | (38,550)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Comprehensive income | (22,513)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 22,107 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Non Guarantors [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 197,593 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 229,890 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Total revenues | 197,593 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 229,890 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Costs of products sold | 164,910 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 189,228 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Gross profit | 32,683 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 40,662 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Selling, general and administrative expenses | 13,900 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 15,745 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Gains on dispositions of plant, equipment and timberlands, net |  | 3 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Operating income | 18,783 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 24,914 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other non-operating income (expense) |  |
Interest expense | (6,394)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2,731)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest income | 5 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 7 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other, net | 655 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,082 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Total non-operating expense | (5,734)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,642)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income before income taxes | 13,049 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 23,272 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income tax provision | 3,248 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,417 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income | 9,801 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 20,855 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other comprehensive income (loss) | 38,848 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 885 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income | $ 48,649 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | $ 21,740 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember

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- Definition Revenue from sales of excess internally generated power, net of costs to produce, and revenue from sales of renewable energy credits. + References No definition available. + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + 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 + Details
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