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Other Assets and Intangibles, net - Summary of Amortization Related to the Intangibles Excluding Below-market Leases (As Lessee) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract] |  |  |  |
Income | $ 1,586 | $ 1,029 | $ 3,263 | $ 1,959
Expense | $ 10,404 | $ 5,309 | $ 19,925 | $ 9,719

X
- Definition Amortization expense of intangibles. + References No definition available. + Details
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Namespace Prefix: | curb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortization income of intangibles. + References No definition available. + Details
Name: | curb_AmortizationIncomeOfIntangibles
Namespace Prefix: | curb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration