XML 163 R38.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2014
Accounting Policies [Abstract] |
Schedule of Range of Estimated Service Lives | The range of estimated service lives used to calculate financial reporting depreciation for principal items of plant and equipment are as follows:
Buildings |  |  | 15 – 45 Years |
Machinery and equipment |  |  | 5 – 40 Years |
Other |  |  | 3 – 25 Years |

X
- Definition The range of estimated service lives used to calculate financial reporting depreciation for principal items of plant and equipment. + References No definition available. + Details
Name: | glt_RangeOfEstimatedServiceLivesUsedToCalculateFinancialReportingDepreciationTableTextBlock
Namespace Prefix: | glt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration