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Accounting Policies - Schedule of Range of Estimated Service Lives (Detail)	12 Months Ended
	Dec. 31, 2013
Minimum [Member]
Property Plant And Equipment Useful Life [Abstract]
Range of estimated service lives	5 years
Minimum [Member] | Buildings [Member]
Property Plant And Equipment Useful Life [Abstract]
Range of estimated service lives	10 years
Minimum [Member] | Machinery and Equipment [Member]
Property Plant And Equipment Useful Life [Abstract]
Range of estimated service lives	7 years
Minimum [Member] | Other [Member]
Property Plant And Equipment Useful Life [Abstract]
Range of estimated service lives	4 years
Maximum [Member]
Property Plant And Equipment Useful Life [Abstract]
Range of estimated service lives	30 years
Maximum [Member] | Buildings [Member]
Property Plant And Equipment Useful Life [Abstract]
Range of estimated service lives	45 years
Maximum [Member] | Machinery and Equipment [Member]
Property Plant And Equipment Useful Life [Abstract]
Range of estimated service lives	35 years
Maximum [Member] | Other [Member]
Property Plant And Equipment Useful Life [Abstract]
Range of estimated service lives	40 years

X

- Details

Name:	glt_PropertyPlantAndEquipmentUsefulLifeAbstract
Namespace Prefix:	glt_
Data Type:	xbrli:stringItemType
Balance Type:	na
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

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration