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Gain on Dispositions of Plant, Equipment and Timberlands - Summary for Sale of Timberlands and Other Assets (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) a	Dec. 31, 2014 USD ($) a	Dec. 31, 2013 USD ($) a
Property, Plant and Equipment [Line Items]
Proceeds	$ 24,459	$ 5,072	$ 1,947
Gain	$ 21,113	$ 4,861	$ 1,726
Timberlands [Member]
Property, Plant and Equipment [Line Items]
Acres | a	15,628	2,753	876
Proceeds	$ 23,917	$ 5,062	$ 1,445
Gain	20,867	4,855	1,410
Other [Member]
Property, Plant and Equipment [Line Items]
Proceeds	542	10	502
Gain	$ 246	$ 6	$ 316

X

- Definition

Acres of timberland.

+ References

No definition available.

+ Details

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Namespace Prefix:	glt_
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X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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X

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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