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Long-Term Debt - Additional Information (Detail) | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2014 USD ($) | Dec. 31, 2014 IKB Loan [Member] DebtAgreements Installment | Apr. 11, 2013 IKB Loan [Member] USD ($) | Apr. 11, 2013 IKB Loan [Member] EUR (€) | Dec. 31, 2014 2014 IKB Loan [Member] Installment | Sep. 04, 2014 2014 IKB Loan [Member] USD ($) | Sep. 04, 2014 2014 IKB Loan [Member] EUR (€) | Dec. 31, 2014 Maximum [Member] | Dec. 31, 2014 Federal Funds Rate [Member] | Dec. 31, 2014 Other Assets [Member] USD ($) | Dec. 31, 2014 5.375% Notes [Member] | Oct. 03, 2012 5.375% Notes [Member] USD ($) | Dec. 31, 2014 Revolving Credit Facility [Member] | Nov. 21, 2011 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2014 Revolving Credit Facility, Due Nov. 2016 [Member] | Dec. 31, 2014 Revolving Credit Facility, Due Nov. 2016 [Member] Minimum [Member] | Dec. 31, 2014 Revolving Credit Facility, Due Nov. 2016 [Member] Maximum [Member] | Dec. 31, 2014 Revolving Credit Facility, Due Nov. 2016 [Member] Daily Euro Rate [Member] Minimum [Member] | Dec. 31, 2014 Revolving Credit Facility, Due Nov. 2016 [Member] Daily Euro Rate [Member] Maximum [Member] | Dec. 31, 2014 Letters of Credit [Member] USD ($) | Dec. 31, 2013 Letters of Credit [Member] USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  |  |  |  |  |  | Oct. 15, 2020 |  | Nov. 21, 2016 |  | Nov. 30, 2016 |  |  |  |  |  |
Federal fund rate spread |  |  |  |  |  |  |  |  |  | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = glt_FederalFundsRateMember |  |  |  |  |  |  | 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |
Margin over Euro-rate |  | 1.00%glt_MarginOverEuroRate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio | 2.15 glt_LeverageRatio |  |  |  |  |  |  |  | 3.50 glt_LeverageRatio / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | 57,600,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = glt_IkbLoanMember | 42,700,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = glt_IkbLoanMember |  | 12,600,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = glt_IkbLoanTwoThousandFourteenMember | 10,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = glt_IkbLoanTwoThousandFourteenMember |  |  |  |  | 250,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesMember |  |  |  |  |  |  |  |  |
Percentage of aggregate principal amount of outstanding |  |  | 2.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = glt_IkbLoanMember |  |  | 2.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = glt_IkbLoanTwoThousandFourteenMember |  |  |  |  |  | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesMember | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesMember |  |  |  |  |  |  |  |  |
Frequency of interest payable |  |  |  |  |  |  |  |  |  |  |  | Semiannually |  |  |  |  |  |  |  |  |  |
Debt instrument redemption |  |  |  |  |  |  |  |  |  |  |  | The 5.375% Notes are redeemable, in whole or in part, at anytime on or after October 15, 2016 at the redemption prices specified in the applicable Indenture. Prior to October 15, 2016, we may redeem some or all of the Notes at a "make-whole" premium as specified in the Indenture. |  |  |  |  |  |  |  |  |  |
Number of separate loan agreement |  |  | 2 glt_DebtInstrumentLoanAgreementNumber / us-gaap_DebtInstrumentAxis = glt_IkbLoanMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  | 32 glt_DebtInstrumentNumberOfInstallmentPayment / us-gaap_DebtInstrumentAxis = glt_IkbLoanMember |  |  | 27 glt_DebtInstrumentNumberOfInstallmentPayment / us-gaap_DebtInstrumentAxis = glt_IkbLoanTwoThousandFourteenMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installments beginning date |  |  | Jun. 30, 2015 |  |  | Sep. 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installments ending date |  |  | Mar. 31, 2023 |  |  | Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregated unamortized deferred debt issuance costs |  |  |  |  |  |  |  |  |  |  | 5,100,000 us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to deferred debt issuance costs |  | 1,300,000 us-gaap_DeferredFinanceCostsOwnshareLendingArrangementIssuanceCostsAmortizationExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,300,000 glt_AmountOfLettersOfCreditIssuedAndReducingAvailabilityUnderRevolvingCreditFacility / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember | 5,200,000 glt_AmountOfLettersOfCreditIssuedAndReducingAvailabilityUnderRevolvingCreditFacility / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember
Letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |

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- Definition Debt Instrument Loan Agreement Number + References No definition available. + Details
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- Definition Ratio of EBITDA over net debt. + References No definition available. + Details
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- Definition Margin over Euro-rate. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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