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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
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Depreciation and amortization expense	$ 2,348	$ 4,689
U.S. Marketplace
Segment Reporting Information [Line Items]
Depreciation and amortization expense	1,686	1,369
Digital Wholesale
Segment Reporting Information [Line Items]
Depreciation and amortization expense	$ 425	$ 3,194

X

- Definition

Cost of goods and services sold depreciation amortization and impairment expense.

+ References

No definition available.

+ Details

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

X

- 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

X

- 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: