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Unfavorable Contracts Liability - Summary of Unfavorable Contracts Liability Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Unfavorable Contracts Liability [Abstract]
December 31, 2017	$ 44,085
Amortization into Wholesale revenues	(6,457)	$ (25,200)
Amortization into Affiliate revenue share	(18,743)
December 31, 2018	$ 18,885	$ 44,085

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- Definition

Amortization of unfavorable contracts liability into affiliate revenue share.

+ References

No definition available.

+ Details

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Period Type:	duration

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- Definition

Amortization of unfavorable contracts liability into wholesale revenue.

+ References

No definition available.

+ Details

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

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- Definition

Unfavorable contracts liability.

+ References

No definition available.

+ Details

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

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- Definition

Unfavorable contracts liability.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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