XML 86 R59.htm IDEA: XBRL DOCUMENT v2.4.0.6

Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2012
Buildings [Member] | Minimum [Member]
Property plant and equipment useful life
Range of estimated service lives	10 years
Buildings [Member] | Maximum [Member]
Property plant and equipment useful life
Range of estimated service lives	45 years
Machinery and equipment [Member] | Minimum [Member]
Property plant and equipment useful life
Range of estimated service lives	7 years
Machinery and equipment [Member] | Maximum [Member]
Property plant and equipment useful life
Range of estimated service lives	35 years
Other [Member] | Minimum [Member]
Property plant and equipment useful life
Range of estimated service lives	4 years
Other [Member] | Maximum [Member]
Property plant and equipment useful life
Range of estimated service lives	40 years

X

- Details

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Namespace Prefix:	glt_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration