XML 29 R67.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Commitments, Contingencies and Legal Proceedings - Additional Information (Detail) |  |  |  | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 09, 2015 USD ($) | Oct. 14, 2014 USD ($) | Sep. 25, 2014 | Jan. 31, 2008 | Jun. 30, 2015 USD ($) Operable_Unit | Dec. 31, 2015 USD ($) | May. 15, 2015 | Dec. 31, 2014 USD ($)
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Number of operable units | Operable_Unit |  |  |  |  | 5 |  |  |
Upper end estimate of total past and future response costs |  | $ 1,100,000,000 |  |  |  |  |  |
Uncertainty premium for future response costs |  | 100,000,000 |  |  |  |  |  |
Cost of response incurred by government |  |  |  |  | $ 4,280,000 |  |  |
Initial minimum amount of NRD assessment |  |  |  |  | 176,000,000 |  |  |
Initial maximum amount of NRD assessment |  |  |  |  | 333,000,000 |  |  |
Revised minimum amount of NRD assessment |  |  |  |  | 287,000,000 |  |  |
Revised maximum amount of NRD assessment |  |  |  |  | 423,000,000 |  |  |
Reserve for environmental liability, expected compensation payments |  | 45,900,000 |  |  |  |  |  |
Environmental loss contingencies |  | 105,000,000 |  |  |  |  |  |
Other prepaid loss contingencies for earlier settlements |  | 59,000,000 |  |  |  |  |  |
Environmental loss contingencies |  |  |  |  | 16,200,000 |  |  | $ 16,300,000
Reserve for Environmental liabilities, current portion |  |  |  |  | $ 9,957,000 |  |  | $ 1,075,000
Maximum estimated percentage of discharge |  |  |  |  | 27.00% |  |  |
Maximum estimated cost related to Fox River matter |  |  |  |  | $ 185,000,000 |  |  |
Whiting Litigation [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Remaining costs and damages amount | $ 33,000,000 |  |  |  |  |  |  |
2015 Work Plan [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Annual estimated cost rate seek by Government | 5,000,000 |  |  |  |  |  |  |
Estimated additional annual cost of contract | 5,000,000 |  |  |  |  |  |  |
Estimated cost of work to satisfy our share of obligation |  |  |  |  | $ 10,000,000 |  |  |
NCR [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Percentage of apportion liability on cost |  |  |  |  |  |  | 28.00% |
NCR and GP [Member] | Whiting Litigation [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Costs and damages amount | 67,000,000 |  |  |  |  |  |  |
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 |  |  |
Minimum [Member] | Appvion [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Litigation claim amount |  |  |  |  | $ 170,000,000 |  |  |
OU1 [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Estimated future cost of work yet to be done |  | 100,000,000 |  |  |  |  |  |
OU2-5 [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Estimated future cost of work yet to be done |  | $ 500,000,000 |  |  |  |  |  |
Annual estimated cost rate seek by Government | $ 100,000,000 |  |  |  | 70,000,000 |  |  |
NCR costs and damages percentage |  |  | 100.00% |  |  |  |  |
OU2-5 [Member] | Whiting Litigation [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
NCR costs and damages percentage |  |  |  | 100.00% |  |  |  |
OU2-5 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Estimated future cost of work yet to be done |  |  |  |  |  | $ 10,000,000 |  |
Dredging Season [Member] |  |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |  |
Annual estimated cost rate seek by Government |  |  |  |  | $ 100,000,000 |  |  |

X
- Definition Amounts recovered by Governments for NRD. + References No definition available. + Details
Name: | glt_AmountsRecoveredByGovernmentsForNrd
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Anticipated cost of work to be performed. + References No definition available. + Details
Name: | glt_AnticipatedCostOfWorkToBePerformed
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments Contingencies And Litigation [Line Items] + References No definition available. + Details
Name: | glt_CommitmentsContingenciesAndLitigationLineItems
Namespace Prefix: | glt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Costs we incurred which, pursuant to court order, are to be reimbursed by another PRP. + References No definition available. + Details
Name: | glt_CostReimbursementDueToUsFromAnotherPotentiallyResponsibleParties
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs And Damages Percentage + References No definition available. + Details
Name: | glt_CostsAndDamagesPercentage
Namespace Prefix: | glt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated annual additional cost of work to be performed. + References No definition available. + Details
Name: | glt_EstimatedAnnualAdditionalCostOfWorkToBePerformed
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated annual cost of work to be performed. + References No definition available. + Details
Name: | glt_EstimatedAnnualCostOfWorkToBePerformed
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated cost of 2015 work plan to be incurred by other parties. + References No definition available. + Details
Name: | glt_EstimatedCostOfTwoThousandFifteenWorkPlanToBeIncurredByOtherParties
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated future cost of work as part of response action. + References No definition available. + Details
Name: | glt_EstimatedFutureCostOfWorkAsPartOfResponseAction
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total response costs estimated by Government. + References No definition available. + Details
Name: | glt_EstimatedRemediationCostsForSite
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The Company's estimated percentage of discharge. + References No definition available. + Details
Name: | glt_MaximumEstimatedPercentageOfDischarge
Namespace Prefix: | glt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Natural Resource Damage Loss Contingency Range Of Possible Loss Maximum + References No definition available. + Details
Name: | glt_NaturalResourceDamageLossContingencyRangeOfPossibleLossMaximum
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Natural Resource Damage Loss Contingency Range of Possible Loss Maximum Revised + References No definition available. + Details
Name: | glt_NaturalResourceDamageLossContingencyRangeOfPossibleLossMaximumRevised
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Natural Resource Damage Loss Contingency Range of Possible Loss Minimum + References No definition available. + Details
Name: | glt_NaturalResourceDamageLossContingencyRangeOfPossibleLossMinimum
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Natural Resource Damage Loss Contingency Range of Possible Loss Minimum Revised + References No definition available. + Details
Name: | glt_NaturalResourceDamageLossContingencyRangeOfPossibleLossMinimumRevised
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The specific areas of the site into which the contaminated area has been separated by the US EPA. + References No definition available. + Details
Name: | glt_NumberOfOperableUnits
Namespace Prefix: | glt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other prepaid accrual for environmental loss contingencies. + References No definition available. + Details
Name: | glt_OtherPrepaidAccrualForEnvironmentalLossContingencies
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of apportion liability on cost assigned to other PRP. + References No definition available. + Details
Name: | glt_PercentageOfApportionLiabilityOnCostAssignedToOtherPrp
Namespace Prefix: | glt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period over which Estimated Cost to be Incurred One + References No definition available. + Details
Name: | glt_PeriodOverWhichEstimatedCostToBeIncurredOne
Namespace Prefix: | glt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining costs and damages amount. + References No definition available. + Details
Name: | glt_RemainingCostsAndDamagesAmount
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Uncertainty premium for future response costs. + References No definition available. + Details
Name: | glt_UncertaintyPremiumForFutureResponseCosts
Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate amount disbursed during the reporting period to settle environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6911-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition High-end of the range estimate of the loss exposure for reasonably possible environmental contingencies at an individual site for which no accrual has been recorded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 + Details
Name: | us-gaap_SiteContingencyLossExposureNotAccruedHighEstimate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LitigationStatusAxis=glt_WhitingLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=glt_TwoThousandFifteenWorkPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=glt_NcrCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=glt_NcrAndGpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=glt_AppvionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=glt_UpstreamMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=glt_DownstreamMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=glt_DredgingSeasonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |