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Segment and Geographic Information - Summary of Segment Revenue, Significant Segment Expenses, Segment Depreciation And Amortization, Segment Income (Loss) From Operations, And The Reconciliation From Segment Income (Loss) From Operations To Consolidated Income Before Income Taxes (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization expense | $ 2,546 | $ 3,430 | $ 4,894 | $ 8,119
Cost of revenue impairment | 2,919 | 180 | 2,919 | 180
U.S. Marketplace |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization expense | 1,864 | 631 | 3,550 | 2,000
Digital Wholesale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization expense | 455 | 2,636 | 880 | 5,830
Cost of revenue impairment | 2,919 | 180 | 2,919 | 180
Other segment items impairment | $ 29,633 | $ 127,475 | $ 29,633 | $ 127,475

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- Definition Cost of goods and services sold depreciation amortization and impairment expense. + References No definition available. + Details
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Namespace Prefix: | carg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cost Of Goods And Services Sold Impairment Expense. + References No definition available. + Details
Name: | carg_CostOfGoodsAndServicesSoldImpairmentExpense
Namespace Prefix: | carg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Segment reporting other segment item impairment expense. + References No definition available. + Details
Name: | carg_SegmentReportingOtherSegmentItemImpairmentExpense
Namespace Prefix: | carg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=carg_UnitedStatesMarketplaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=carg_DigitalWholesaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |