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Consolidated Statements of Redeemable Noncontrolling Interest and Stockholders' Equity (Parenthetical)	Dec. 31, 2021	Jan. 14, 2021
CarOffer
Business acquisition, percentage of equity interest acquired	51.00%	51.00%

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=carg_CarOfferMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: