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Compass Concierge Receivables and Allowance for Credit Losses - Additional Information (Detail)	Sep. 30, 2024	Dec. 31, 2023
Receivables [Abstract]
Financing receivables related to unsold properties (in percent)	98.00%	97.00%

X

- Definition

Percentage of financing receivables relating to unsold properties.

+ References

No definition available.

+ Details

Name:	comp_PercentageOfFinancingReceivablesRelatingToUnsoldProperties
Namespace Prefix:	comp_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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