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Income Taxes - Schedule of Current and Non-Current Deferred Tax Assets and Liabilities Balance Sheet Captions (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Prepaid expenses and other current assets	$ 21,447	$ 16,319
Other long term assets	9,197	8,110
Other current liabilities	12	687
Deferred income taxes	$ 141,020	$ 62,046

X

- Definition

Deferred tax assets arising from assets reported under the balance sheet caption "other assets".

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Deferred tax assets arising from prepaid expenses and other current assets.

+ References

No definition available.

+ Details

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X

- Definition

Deferred tax liabilities arising from liabilities reported under the balance sheet caption "other long-term liabilities".

+ References

No definition available.

+ Details

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Namespace Prefix:	glt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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