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

X

- Definition

Commitments for maintenance gen exp of properties.

+ References

No definition available.

+ Details

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

X

- Definition

Contingencies and commitments.

+ References

No definition available.

+ Details

Name:	curb_ContingenciesAndCommitmentsLineItems
Namespace Prefix:	curb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration