Operating Expenses (Tables)

12 Months Ended

Dec. 31, 2017

Operating Expenses [Abstract]

Schedule of Direct Operating Expenses

Year ended December 31,		2017		2016		2015
Employee compensation expenses	$	35,440	$	27,856	$	22,855
Buildings, facilities and technology expenses		8,359		7,966		7,179
Travel, advertising and promotion expenses		23,994		23,688		22,150
Other costs of services		11,220		6,552		3,842
	$	79,013	$	66,062	$	56,026

Schedule of Selling, General and Administrative Expenses

Year ended December 31,		2017		2016		2015
Employee compensation expenses	$	208,370	$	180,929	$	166,227
Buildings, facilities and technology expenses		53,151		49,219		41,404
Travel, advertising and promotion expenses		30,440		24,384		22,307
Professional fees		13,522		13,344		12,500
Other SG&A expenses		17,787		15,653		11,951
	$	323,270	$	283,529	$	254,389

Schedule of Acquisition Related Costs

Year ended December 31,		2017		2016		2015
IronPlanet: (note 32)					$	-
Stock option compensation
expense (note 28)	$	4,752	$	-
Legal costs		8,898		3,402
Other acquisition-related costs		21,003		4,800
Mascus: (note 32)
Continuing employment costs		530		954		-
Other acquisition-related costs		22		766		-
Xcira:
Continuing employment costs		1,811		1,111		191
Other acquisition-related costs		-		-		410
Petrowsky: (note 32)
Continuing employment costs		649		350		-
Other acquisition-related costs		4		254		-
Kramer: (note 32)
Continuing employment costs		428		76		-
Other acquisition-related costs		79		116
Other		96		-		-
	$	38,272	$	11,829	$	601

Schedule of Depreciation and Amortization Expenses

Year ended December 31,		2017		2016		2015
Depreciation expense	$	28,337	$	30,983	$	35,374
Amortization expense		24,357		9,878		6,658
	$	52,694	$	40,861	$	42,032