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Accounts receivable, net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Receivables [Abstract]
Accounts receivable, reserve percentage calculation period	3 years
Threshold period for reserves	90 days
Bad debt expense	$ 5,155	$ 12,316

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- Definition

Accounts Receivable, Reserve Percentage Calculation Period

+ References

No definition available.

+ Details

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- Definition

Threshold Period Past Due For Reservation Of Trade Accounts Receivable

+ References

No definition available.

+ Details

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Namespace Prefix:	gci_
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Balance Type:	na
Period Type:	duration

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- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

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