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