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Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Contingencies |  |
Assets guaranteed under contract | $ 43,450 | $ 22,773
Percentage of assets expected to be sold | 61.00% | 23.00%

X
- Definition Minimum level of proceeds guaranteed to consignors on the sale at auction of that consignor's equipment. + References No definition available. + Details
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Balance Type: | debit
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- Definition Guarantor Obligations, Proceeds on Auction Sale, Proceeds Percentage + References No definition available. + Details
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Namespace Prefix: | rba_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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