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Other current assets (Summary of Assets Held For Sale) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Other current assets |  |
Beginning balance | $ 15,051 | $ 15,051
Reclassified from (to) property, plant and equipment | (6,888) | 4,071
Disposal | $ (8,163) | (4,071)
Ending balance |  | $ 15,051

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- Definition Assets Held-for-sale, Reduction as Result of Disposal + References No definition available. + Details
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Namespace Prefix: | rba_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reclassified Assets Held-for-sale + References No definition available. + Details
Name: | rba_ReclassifiedAssetsHeldForSale
Namespace Prefix: | rba_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220 + Details
Name: | us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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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