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Revenue From Contracts With Customers - Contract Balances Outstanding (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Current deferred revenue
Balance as of December 31, 2017	$ 20,784
Increases due to billings	15,548
Revenue recognized	(30,803)
Foreign currency impact	(149)
Balance as of December 31, 2018	5,380
Long-Term deferred revenue
Increases due to billings	15,548
Revenue recognized	(30,803)
Foreign currency impact	(149)
Long-Term deferred revenue
Current deferred revenue
Increases due to billings	8,241
Revenue recognized	0
Foreign currency impact	(525)
Long-Term deferred revenue
Balance as of December 31, 2017	0
Increases due to billings	8,241
Revenue recognized	0
Foreign currency impact	(525)
Balance as of December 31, 2018	$ 7,716

X

- Definition

Contract with Customer, Liability, Current [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	gti_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Foreign Currency Impact

+ References

No definition available.

+ Details

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Namespace Prefix:	gti_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Noncurrent [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	gti_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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-Publisher FASB
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-Topic 606
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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X

- Definition

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

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