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Compass Concierge Receivables and Allowance for Credit Losses - Additional Information (Detail)	Dec. 31, 2021	Dec. 31, 2020
Concierge Receivables [Member]
Percentage of amount of outstanding receivables related to unsold properties	96.00%	93.00%

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- Definition

Percentage of amount of outstanding financing receivables related tO unsold properties.

+ References

No definition available.

+ Details

Name:	comp_PercentageOfAmountOfOutstandingFinancingReceivablesRelatedToUnsoldProperties
Namespace Prefix:	comp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=comp_ConciergeReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: