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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, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Prepaid expenses and other current assets	$ 20,017glt_DeferredTaxAssetsPrepaidExpensesAndOtherCurrentAssets	$ 21,447glt_DeferredTaxAssetsPrepaidExpensesAndOtherCurrentAssets
Other assets	8,830us-gaap_DeferredTaxAssetsOther	9,197us-gaap_DeferredTaxAssetsOther
Other current liabilities	234glt_DeferredTaxLiabilitiesOtherCurrentLiabilities	12glt_DeferredTaxLiabilitiesOtherCurrentLiabilities
Deferred income taxes	$ 104,016us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 141,020us-gaap_DeferredTaxAssetsLiabilitiesNet

X

- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- 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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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319

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