Acquisitions (Details Narrative) CAD in Thousands, $ in Thousands				1 Months Ended				3 Months Ended	9 Months Ended
	Dec. 01, 2015 USD ($)	Oct. 26, 2015 USD ($)	Oct. 26, 2015 CAD	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jan. 31, 2016 USD ($)	Apr. 30, 2015	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Initial purchase price									$ 93
Payments of earn-out liability									9,820	$ 5,443
Accrued earn-out liability included in other long-term liabilities								$ 10,175	10,175		$ 20,289
March 31, 2018 [Member]
Contingent consideration to be paid throughout the earn out period								38,600	38,600
Systemax's North American Technology Group [Member]
Initial purchase price	$ 14,000
Option exercised						$ 400
Acrodex, Inc. [Member]
Initial purchase price		$ 13,600		$ 100	$ 200
Acrodex, Inc. [Member] | Canadian Dollar [Member]
Initial purchase price | CAD			CAD 16,700
En Pointe Technologies Sales Inc [Member]
Percentage of future adjusted gross profit							22.50%
Percentage of future service revenue							10.00%
Payments of earn-out liability								3,900	9,800
Accrued earn-out liability included in accrued expenses and other current liabilities								13,200	13,200		13,200
Accrued earn-out liability included in other long-term liabilities								$ 6,600	$ 6,600		$ 16,500