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Compass Concierge Receivables and Allowance for Credit Losses - Summary of Aging Analysis of Concierge Receivables (Detail) $ in Millions	Sep. 30, 2024 USD ($)
Financing Receivable, Past Due [Line Items]
Concierge receivables	$ 45.2
Current
Financing Receivable, Past Due [Line Items]
Concierge receivables	40.7
31-90 days past due
Financing Receivable, Past Due [Line Items]
Concierge receivables	1.4
Over 90 days past due
Financing Receivable, Past Due [Line Items]
Concierge receivables	$ 3.1

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- Definition

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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