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Commitments, Contingencies and Legal Proceedings - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended
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Oct. 14, 2014 | Mar. 31, 2015 Operable_Unit | Apr. 09, 2015 | Sep. 25, 2014 | Jan. 31, 2008
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
Number of operable units |  | 5 glt_NumberOfOperableUnits |  |  |
Upper end estimate of total past and future response costs | $ 1,100,000,000 us-gaap_SiteContingencyLossExposureNotAccruedHighEstimate |  |  |  |
Uncertainty premium for future response costs | 100,000,000 glt_UncertaintyPremiumForFutureResponseCosts |  |  |  |
Initial minimum amount of NRD assessment |  | 176,000,000 glt_NaturalResourceDamageLossContingencyRangeOfPossibleLossMinimum |  |  |
Initial maximum amount of NRD assessment |  | 333,000,000 glt_NaturalResourceDamageLossContingencyRangeOfPossibleLossMaximum |  |  |
Revised minimum amount of NRD assessment |  | 287,000,000 glt_NaturalResourceDamageLossContingencyRangeOfPossibleLossMinimumRevised |  |  |
Revised maximum amount of NRD assessment |  | 423,000,000 glt_NaturalResourceDamageLossContingencyRangeOfPossibleLossMaximumRevised |  |  |
Natural resource damage compensation by settling parties | 45,900,000 glt_NaturalResourceDamageCompensationBySettlingParties |  |  |  |
Total amount recovered by governments for natural resource damages | 105,000,000 glt_AmountRecoveredByGovernmentsForNaturalResourceDamages |  |  |  |
Other prepaid loss contingencies for earlier settlements | 59,000,000 glt_OtherPrepaidAccrualForEnvironmentalLossContingencies |  |  |  |
Cost of response incurred by government |  | 4,280,000 glt_CostReimbursementDueToUsFromAnotherPotentiallyResponsibleParties |  |  |
Reserve for Environmental liabilities, current portion |  | 5,000,000 glt_AccrualForEnvironmentalLossContingenciesCurrent |  |  |
Total reserves for site |  | 16,200,000 us-gaap_AccrualForEnvironmentalLossContingencies |  |  |
Maximum estimated percentage of discharge |  | 27.00%glt_MaximumEstimatedPercentageOfDischarge |  |  |
Maximum estimated cost related to Fox River matter |  | 185,000,000 glt_MaximumEstimatedCostInExcessOfAmountsReserved |  |  |
Subsequent Event [Member] | Whiting Litigation [Member] |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
Remaining costs and damages amount |  |  | 33,000,000 glt_RemainingCostsAndDamagesAmount / us-gaap_LitigationStatusAxis = glt_WhitingLitigationMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Subsequent Event [Member] | Whiting Litigation [Member] | NCR and GP [Member] |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
Costs and damages amount |  |  | 67,000,000 glt_CostsAndDamagesAmount / dei_LegalEntityAxis = glt_NcrAndGpMember / us-gaap_LitigationStatusAxis = glt_WhitingLitigationMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Maximum [Member] |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
Period over which estimated cost to be incurred |  | 3 years |  |  |
Minimum [Member] |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
Period over which estimated cost to be incurred |  | 2 years |  |  |
OU1 [Member] |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
Estimated future cost of work yet to be done | 100,000,000 glt_EstimatedFutureCostOfWorkAsPartOfResponseAction / us-gaap_LitigationCaseAxis = glt_UpstreamMember |  |  |  |
OU2-5 [Member] |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
Estimated future cost of work yet to be done | 500,000,000 glt_EstimatedFutureCostOfWorkAsPartOfResponseAction / us-gaap_LitigationCaseAxis = glt_DownstreamMember |  |  |  |
Annual estimated cost rate seek by Government |  | 70,000,000 glt_EstimatedAnnualCostOfWorkToBePerformed / us-gaap_LitigationCaseAxis = glt_DownstreamMember |  |  |
NCR costs and damages percentage |  |  |  | 100.00%glt_CostsAndDamagesPercentage / us-gaap_LitigationCaseAxis = glt_DownstreamMember |
OU2-5 [Member] | Whiting Litigation [Member] |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
NCR costs and damages percentage |  |  |  |  | 100.00%glt_CostsAndDamagesPercentage / us-gaap_LitigationCaseAxis = glt_DownstreamMember / us-gaap_LitigationStatusAxis = glt_WhitingLitigationMember
OU2-5 [Member] | Subsequent Event [Member] |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
Annual estimated cost rate seek by Government |  |  | 100,000,000 glt_EstimatedAnnualCostOfWorkToBePerformed / us-gaap_LitigationCaseAxis = glt_DownstreamMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Dredging Season [Member] |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |
Annual estimated cost rate seek by Government |  | $ 100,000,000 glt_EstimatedAnnualCostOfWorkToBePerformed / us-gaap_LitigationCaseAxis = glt_DredgingSeasonMember |  |  |

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- Definition Costs we incurred which, pursuant to court order, are to be reimbursed by another PRP. + References No definition available. + Details
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- Definition The specific areas of the site into which the contaminated area has been separated by the US EPA. + References No definition available. + Details
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