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Acquisitions - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended | 8 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2013 | Dec. 31, 2013 | Oct. 01, 2014
Business Acquisition [Line Items] |  |  |  |  |  |
Revenue | $ 1,810,342,000 us-gaap_SalesRevenueNet | $ 1,725,768,000 us-gaap_SalesRevenueNet | $ 1,584,788,000 us-gaap_SalesRevenueNet |  |  |
Payment made for acquisition, net of cash acquired | 8,015,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 210,911,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |
Revenue |  | 1,779,434,000 us-gaap_BusinessAcquisitionsProFormaRevenue | 1,727,538,000 us-gaap_BusinessAcquisitionsProFormaRevenue |  |  |
Remaining useful life of intangible assets | 17 years |  |  |  |  |
Goodwill | 84,137,000 us-gaap_Goodwill | 95,948,000 us-gaap_Goodwill |  |  | 95,948,000 us-gaap_Goodwill |
Intangible assets | 87,596,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill |  |  |  |  |
Identifiable intangible assets | 9,800,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired |  |  |  |  |
Operating income | 106,780,000 us-gaap_OperatingIncomeLoss | 86,519,000 us-gaap_OperatingIncomeLoss | 101,874,000 us-gaap_OperatingIncomeLoss |  |  |
Acquisition related costs |  | 3,200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |  |
Fair value write up of acquired inventory |  | 1,100,000 glt_FairValueWriteUpOfAcquiredInventory |  |  |  |
Integration related costs |  | 2,000,000 us-gaap_BusinessCombinationIntegrationRelatedCosts |  |  |  |
Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Useful life of property plant and equipment | 5 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Useful life of property plant and equipment | 30 years |  |  |  |  |
Dresden Papier GmbH [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date of acquisition | Apr. 30, 2013 |  |  |  |  |
Revenue |  |  |  |  | 101,800,000 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = glt_DresdenPapierGmbhMember |
Payment made for acquisition, net of cash acquired |  |  |  | 210,911,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = glt_DresdenPapierGmbhMember |  |
Revenue |  | 158,600,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = glt_DresdenPapierGmbhMember |  |  |  |
Number of employees |  | 146 glt_BusinessAcquisitionPreacquiredNumberOfEmployees / us-gaap_BusinessAcquisitionAxis = glt_DresdenPapierGmbhMember |  |  |  |
Manufacturing capacity |  | 72,800 glt_BusinessAcquisitionPreacquiredManufacturingCapacity / us-gaap_BusinessAcquisitionAxis = glt_DresdenPapierGmbhMember |  |  |  |
Goodwill | 74,900,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = glt_DresdenPapierGmbhMember |  |  |  |  |
Intangible assets | 87,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = glt_DresdenPapierGmbhMember |  |  |  |  |
Operating income |  |  |  |  | 18,300,000 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = glt_DresdenPapierGmbhMember |
Spezialpapierfabrik Oberschmitten GmbH [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date of acquisition | Oct. 01, 2014 |  |  |  |  |
Payment made for acquisition |  |  |  |  |  | 8,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = glt_SpezialpapierfabrikOberschmittenGmbhMember
Revenue |  |  |  |  |  | $ 33,000,000 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = glt_SpezialpapierfabrikOberschmittenGmbhMember

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs. + References No definition available. + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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