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Unfavorable Contracts Liability - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Unfavorable Contracts Liability [Abstract]
Percentage of retail rate charged to affiliates	60.00%	60.00%
Amortization into Wholesale revenue		$ 1,358	$ 25,200
Unfavorable contracts liability, current		0	$ 18,885
Amortization into Affiliate revenue share		$ 17,527

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- Definition

Amortization of unfavorable contracts liability into affiliate revenue share expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	cars_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortization of unfavorable contracts liability into wholesale revenue.

+ References

No definition available.

+ Details

Name:	cars_AmortizationOfUnfavorableContractsLiabilityIntoWholesaleRevenue
Namespace Prefix:	cars_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of retail rate charges to affiliates.

+ References

No definition available.

+ Details

Name:	cars_PercentageOfRetailRateChargesToAffiliates
Namespace Prefix:	cars_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Unfavorable contracts liability.

+ References

No definition available.

+ Details

Name:	cars_UnfavorableContractsLiabilityAbstract
Namespace Prefix:	cars_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Unfavorable contracts liability current.

+ References

No definition available.

+ Details

Name:	cars_UnfavorableContractsLiabilityCurrent
Namespace Prefix:	cars_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant