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Income Taxes (Details 6) | 12 Months Ended
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Dec. 31, 2012
United States - Federal [Member] |
Summary of tax years that remain subject to examination by major jurisdiction |
Income tax examinations not yet initiated | 2009 – 2012
United States - State [Member] |
Summary of tax years that remain subject to examination by major jurisdiction |
Income tax examinations not yet initiated | 2008 – 2012
Income tax examination in progress | 2004, 2006, 2008, 2009
Canada [Member] |
Summary of tax years that remain subject to examination by major jurisdiction |
Income tax examinations not yet initiated | 2010 – 2012
Income tax examination in progress | 2007 – 2011
Germany [Member] |
Summary of tax years that remain subject to examination by major jurisdiction |
Income tax examinations not yet initiated | 2007, 2010 – 2012
Income tax examination in progress | 2008 – 2010
France [Member] |
Summary of tax years that remain subject to examination by major jurisdiction |
Income tax examinations not yet initiated | 2010 – 2012
United Kingdom [Member] |
Summary of tax years that remain subject to examination by major jurisdiction |
Income tax examinations not yet initiated | 2009 – 2012
Philippines [Member] |
Summary of tax years that remain subject to examination by major jurisdiction |
Income tax examinations not yet initiated | 2011 – 2012
Income tax examination in progress | 2010

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- Definition Income tax examination in progress. + References No definition available. + Details
Name: | glt_IncomeTaxExaminationInProgress
Namespace Prefix: | glt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Income tax examination not yet initiated. + References No definition available. + Details
Name: | glt_IncomeTaxExaminationNotYetInitiated
Namespace Prefix: | glt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | glt_TaxYearsThatRemainSubjectToExaminationAbstract
Namespace Prefix: | glt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration