Assets Held For Sale (Narrative) (Details)	3 Months Ended
Mar. 31, 2016
Assets Held For Sale [Abstract]
Timing of sale	12 months

Disposal Group, Including Discontinued Operation, Timing of Disposal

No definition available.

Name:	rba_DisposalGroupIncludingDiscontinuedOperationTimingOfDisposal
Namespace Prefix:	rba_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration