Contingently Redeemable Non-controlling Interest in Ritchie Bros. Financial Services (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items]
Redemption value, cost of capital	15.00%
Redemption value, long-term earnings growth	4.00%
Ritchie Bros. Financial Services [Member]
Redeemable Noncontrolling Interest [Line Items]
Percentage of ownership interest	51.00%
Percentage ownership by non-controlling interest holders	49.00%