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Compass Concierge Receivables and Allowance for Credit Losses - Schedule of Aging Analysis of Concierge Receivables (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 50.2 | $ 66.7
Financing Receivables Overdue Up to Thirty One Days And Less Than Ninety Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0.9 | 5.5
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8.3 | 10.8
Financial Asset, Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9.2 | 16.3
Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 41.0 | $ 50.4

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