XML 138 R118.htm IDEA: XBRL DOCUMENT v3.22.0.1

Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail)	Dec. 31, 2021 EUR (€)	Dec. 31, 2021 PHP (₱)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2021 GBP (£)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 PHP (₱)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CAD ($)	Dec. 31, 2020 GBP (£)
Cash Flow Hedges | Euro to British Pound | Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	€ 18,823,000					€ 18,638,000
Cash Flow Hedges | Philippine Peso To Euro | Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱		₱ 0					₱ 18,522,000
Cash Flow Hedges | U S Dollar To Euro | Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount			$ 658,000					$ 1,041,000
Cash Flow Hedges | Canadian Dollar / U.S. Dollar | Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount				$ 0					$ 70,000
Cash Flow Hedges | U.S. Dollar / Canadian Dollar | Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount				$ 36,904,000					$ 34,847,000
Cash Flow Hedges | Euro To Philippine Peso | Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱		896,291,000					853,686,000
Cash Flow Hedges | British Pound / Philippine Peso | Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱		₱ 1,121,183,000					₱ 1,081,791,000
Cash Flow Hedges | Euro / U.S. Dollar | Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount			108,467,000					69,324,000
Cash Flow Hedges | U S Dollar To British Pound | Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount			16,205,000					0
Foreign Currency Hedges | Euro to British Pound | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	0					600,000
Foreign Currency Hedges | Euro / U.S. Dollar | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	11,000,000					0
Foreign Currency Hedges | Euro / U.S. Dollar | Not Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount			20,900,000					7,500,000
Foreign Currency Hedges | U S Dollar To British Pound | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount			26,600,000					25,250,000
Foreign Currency Hedges | British Pound To Euro | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					£ 3,400,000					£ 1,900,000
Foreign Currency Hedges | British Pound To Euro | Not Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	5,300,000					0
Foreign Currency Hedges | US Dollar To Swiss Franc | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount			$ 2,180,000					$ 0
Foreign Currency Hedges | British Pound To Swiss Franc | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					£ 1,025,000					£ 0
Foreign Currency Hedges | Euro To Swiss Franc | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	€ 2,750,000					€ 0

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_EuroToBritishPoundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_PhilippinePesoToEuroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_USDollarToEuroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_CanadianDollarToUSDollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_UsDollarToCanadianDollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_EuroToPhilippinePesoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_BritishPoundToPhilippinePesoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_EuroToUSDollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_USDollarToBritishPoundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=glt_ForeignCurrencyHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_BritishPoundToEuroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_USDollarToSwissFrancMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_BritishPoundToSwissFrancMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=glt_EuroToSwissFrancMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: