Commitments and Contingencies - Additional Information (Detail) $ in Millions	Sep. 30, 2026 USD ($)
Contingencies And Commitments [Line Items]
Purchase order obligations for the maintenance and general expenses of convenience properties	$ 2.2

Commitments for maintenance gen exp of properties.

No definition available.

Name:	curb_CommitmentsForMaintenanceGenExpOfProperties
Namespace Prefix:	curb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant