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Fair Value of Financial Instruments - Carrying Value and Fair Value of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 404,612us-gaap_LongTermDebt	$ 442,325us-gaap_LongTermDebt
Fair Value	411,757us-gaap_LongTermDebtFairValue	446,025us-gaap_LongTermDebtFairValue
Variable Rate Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	90,555us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember	133,540us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember
Fair Value	90,555us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember	133,540us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember
Fixed-Rate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	250,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FixedRateBondsMember	250,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FixedRateBondsMember
Fair Value	255,470us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_FixedRateBondsMember	254,533us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_FixedRateBondsMember
2.05% Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	51,902us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember	58,785us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember
Fair Value	53,106us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember	57,952us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember
2.40% Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	12,155us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanMember
Fair Value	$ 12,626us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanMember

X

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

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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X

- Details

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- Details

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X

- Details

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Period Type: