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Compass Concierge Receivables and Allowance for Credit Losses - Additional Information (Detail)	Mar. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Percentage of financing receivables related to unsold properties	95.00%	93.00%

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- Definition

Percentage of financing receivables relating to unsold properties.

+ References

No definition available.

+ Details

Name:	comp_PercentageOfFinancingReceivablesRelatingToUnsoldProperties
Namespace Prefix:	comp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration