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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
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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
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration