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Revenues - Schedule of Changes in the Contract Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Balance as of beginning of the period	$ 4,486	$ 5,537
Revenue recognized from opening balance of contract liabilities	(4,486)	(5,537)
Increase due to cash received	141,126	129,585
Revenue recognized from cash received during the period	(135,513)	(122,003)
Foreign exchange effect	52	(28)
Balance as of end of the period	$ 5,665	$ 7,554

X

- Definition

Contract With Customer Liability, Additional Liability Recognized

+ References

No definition available.

+ Details

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Namespace Prefix:	gct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with customer liability revenue recognized from cash received during the year.

+ References

No definition available.

+ Details

Name:	gct_ContractWithCustomerLiabilityRevenueRecognizedFromCashReceivedDuringTheYear
Namespace Prefix:	gct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Contract with customer, liability, foreign exchange effect.

+ References

No definition available.

+ Details

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Namespace Prefix:	gct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

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- References

No definition available.

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