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Compass Concierge Receivables and Allowance for Credit Losses - Additional Information (Detail) | Dec. 31, 2021 | Dec. 31, 2020
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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: |