Contingently Redeemable Non-controlling Interest in Ritchie Bros. Financial Services	12 Months Ended
	Dec. 31, 2015
Contingently Redeemable Non-controlling Interest in Ritchie Bros. Financial Services [Abstract]
Contingently Redeemable Non-controlling Interest in Ritchie Bros. Financial Services	8.Contingently redeemable non-controlling interest in Ritchie Bros. Financial Services The Company holds a 51% interest in Ritchie Bros. Financial Services (”RBFS”), an entity that provides loan origination services to enable the Company’s auction customers to obtain financing from third party lenders. As a result of the Company’s involvement with RBFS, the Company is exposed to risks related to the recovery of the net assets of RBFS as well as liquidity risks associated with the put option discussed below. 8. Contingently redeemable non-controlling interest in Ritchie Bros. Financial Services (continued) The Company has determined RBFS is a variable interest entity because the Company provides subordinated financial support to RBFS and because the Company’s voting interest is disproportionately low in relation to its economic interest in RBFS while substantially all the activities of RBFS involve or are conducted on behalf of the Company. The Company has determined it is the primary beneficiary of RBFS as it is part of a related party group that has the power to direct the activities that most significantly impact RBFS’s economic performance, and although no individual member of that group has such power, the Company represents the member of the related party group that is most closely associated with RBFS. The Company and the non-controlling interest (“NCI”) holders each hold options pursuant to which the Company may acquire, or be required to acquire, the NCI holders’ 49% interest in RBFS. These call and put options become exercisable in April 2016. As a result of the existence of the put option, the NCI is accounted for as a contingently redeemable equity instrument (the “contingently redeemable NCI”). At all reporting periods presented, the Company determined that redemption was probable and measured the carrying value of the contingently redeemable NCI at its estimated redemption value. The NCI can be redeemed at a purchase price to be determined through an independent appraisal process conducted in accordance with the terms of the agreement, or at a negotiated price (the “redemption value”) and therefore, the redemption value on exercise may materially differ from the redemption value as at December 31, 2015. The Company has the option to elect to pay the purchase price in either cash or shares of the Company, subject to the Company obtaining all relevant security exchange and regulatory consents and approvals. The redemption value of the contingently redeemable NCI was determined based on a blended analysis of a capitalized cash flow approach and a market value approach towards determining an estimated fair value of RBFS, with adjustments for relevant market participant data. The Company has estimated the redemption value using the capitalized cash flow approach, with significant inputs including the capitalization multiple, which is based on an estimated weighted average cost of capital of 15%, as well as a long-term earnings growth for RBFS of 4% and foreign exchange rates. Significant estimates in the market value approach include identifying similar companies with comparable business factors to RBFS, and implied valuation multiples for these companies. The estimation of fair value as a basis of determining the redemption value required management to make significant judgments, estimates, and assumptions as of the reporting date. Those judgments, estimates, and assumptions could vary significantly between the reporting date and when the call and put options become exercisable in April 2016.