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Contingencies (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Contingencies
Assets guaranteed under contract	$ 56,257,000	$ 22,773,000
Percentage of assets expected to be sold	83.00%	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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X

- Definition

Guarantor Obligations, Proceeds on Auction Sale, Proceeds Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	rba_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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