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Financial Derivatives and Hedging Activities (Details) (Designated as hedging [Member], Forward foreign currency exchange contracts [Member]) In Thousands, unless otherwise specified	Mar. 31, 2013 Euro / U.S. dollar [Member] EUR (€)	Dec. 31, 2012 Euro / U.S. dollar [Member] EUR (€)	Mar. 31, 2013 U.S. dollar / Canadian dollar [Member] USD ($)	Dec. 31, 2012 U.S. dollar / Canadian dollar [Member] USD ($)
Sell / Buy
Buy Notional	€ 25,929	€ 27,003	$ 12,528	$ 12,369

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Namespace Prefix:	glt_
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X

- Definition

Aggregate notional amount of foreign currency derivatives to purchase a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

+ Details

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