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Discontinued Operations - Summary of Significant Non-cash Items and Capital Expenditures of Discontinued Operations (Parenthetical) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)
Discontinued Operations and Disposal Groups [Abstract]
Capitalized hosting arrangements	$ 0.3
Capitalized internal-use software	0.8
Capitalized website development costs	4.8
Impairment intangible assets	6.6
Impairment goodwill	$ 19.6

X

- Definition

Impairment goodwill.

+ References

No definition available.

+ Details

Name:	carg_ImpairmentGoodwill
Namespace Prefix:	carg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Impairment of capitalized hosting arrangements.

+ References

No definition available.

+ Details

Name:	carg_ImpairmentOfCapitalizedHostingArrangements
Namespace Prefix:	carg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Impairment of capitalized internal use software

+ References

No definition available.

+ Details

Name:	carg_ImpairmentOfCapitalizedInternalUseSoftware
Namespace Prefix:	carg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Impairment of capitalized website development.

+ References

No definition available.

+ Details

Name:	carg_ImpairmentOfCapitalizedWebsiteDevelopment
Namespace Prefix:	carg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Impairment of intangible assets.

+ References

No definition available.

+ Details

Name:	carg_ImpairmentOfIntangibleAssets
Namespace Prefix:	carg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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