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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization expense | $ 2,645 | $ 2,849 | $ 7,539 | $ 10,968
Cost of revenue impairment |  | 9,750 | 2,919 | 9,930
U.S. Marketplace |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization expense | 2,167 | 824 | 5,717 | 2,824
Digital Wholesale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization expense | $ 205 | 1,804 | 1,085 | 7,634
Cost of revenue impairment |  | 9,750 | 2,919 | 9,930
Other segment items impairment |  | $ 7,026 | $ 29,633 | $ 134,501

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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
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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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |