Operating Expenses (Tables)

9 Months Ended

Sep. 30, 2018

Operating Expenses [Abstract]

Schedule of Direct Operating Expenses

	Three months ended				Nine months ended
	September 30,				September 30,
		2018		2017		2018		2017
Ancillary and logistical service expenses	$	11,682	$	13,878	$	46,242	$	40,106
Employee compensation expenses		10,170		10,032		30,120		24,321
Buildings, facilities and technology expenses		1,990		1,872		7,280		5,819
Travel, advertising and promotion expenses		5,921		5,562		20,535		17,644
Other costs of services		3,290		2,117		8,566		6,203
	$	33,053	$	33,461	$	112,743	$	94,093

Schedule of Selling, General and Administrative Expenses

	Three months ended				Nine months ended
	September 30,				September 30,
		2018		2017		2018		2017
Employee compensation expenses	$	56,959		55,560	$	186,951	$	147,420
Buildings, facilities and technology expenses		15,058		13,494		45,767		39,088
Travel, advertising and promotion expenses		9,302		8,431		27,821		21,212
Professional fees		2,983		3,381		12,638		9,705
Other SG&A expenses		4,021		4,469		13,875		12,862
	$	88,323	$	85,335	$	287,052	$	230,287

Schedule of Acquisition Related Costs

	Three months ended				Nine months ended
	September 30,				September 30,
		2018		2017		2018		2017
IronPlanet:
Other acquisition-related costs	$	1,756	$	2,712	$	2,876	$	32,591
Other acquisitions:
Continuing employment costs		251		829		2,104		2,421
Other acquisition-related costs		-		46		59		150
	$	2,007	$	3,587	$	5,039	$	35,162

Schedule of Depreciation and Amortization Expenses

	Three months ended				Nine months ended
	September 30,				September 30,
		2018		2017		2018		2017
Depreciation expense	$	7,252	$	7,228	$	21,460	$	20,813
Amortization expense		9,471		7,609		27,991		16,234
	$	16,723	$	14,837	$	49,451	$	37,047