Acquisitions (Details Narrative) CAD in Thousands								1 Months Ended							12 Months Ended
	Dec. 29, 2016 USD ($)	Dec. 29, 2016 CAD	Dec. 01, 2016 USD ($)	Dec. 01, 2015 USD ($)	Oct. 26, 2015 USD ($)	Oct. 26, 2015 CAD	Apr. 02, 2015 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jan. 31, 2016 USD ($)	Mar. 31, 2015 USD ($) ft²	Feb. 28, 2015 USD ($)	Jan. 31, 2015 USD ($) a	Jul. 31, 2013	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2012 USD ($) a
Initial purchase price															$ 1,584,000
Accrued earn-out liability included in other long-term liabilities															7,039,000	20,289,000
Operating profit															34,791,000	(25,482,000)	15,705,000
Inventory															80,872,000	55,386,000
Payments of earn-out liability															13,058,000	8,938,000
Amortization expense															5,800,000	1,300,000	$ 300,000
Long term note															141,915,000	201,604,000
Lewis Center [Member] | Office And Warehouse Space [Member]
Square feet of office | a													144,000
Revolving Credit Facility [Member]
Purchase price of real property													$ 6,600,000					$ 1,100,000
Long term note													$ 4,575,000		$ 107,396,000
Square feet of office | a																		7.9
Note payable term													7 years
Note payable bears interest at variable rate															2.39%
Revolving Credit Facility [Member] | Loan Agreement [Member]
Purchase price of real property											$ 5,800,000		$ 6,600,000
Long term note											$ 4,900,000	$ 4,575,000	$ 4,575,000
Square feet of office											60,000		12.4
Cash paid to real estate property													$ 2,200,000
Note payable term											7 years	5 years		5 years
Note payable principal amortization period												25 years
Revolving Credit Facility [Member] | Loan Agreement [Member] | LIBOR Rate [Member]
Note payable bears interest at variable rate												2.25%
Stratiform, Inc [Member]
Initial purchase price	$ 1,600,000
Contingent consideration to be paid throughout the earn out period															$ 700,000
Accrued earn-out liability included in accrued expenses and other current liabilities															300,000
Accrued earn-out liability included in other long-term liabilities															300,000
Stratiform, Inc [Member] | Canadian Dollar [Member]
Initial purchase price | CAD		CAD 2,100
Systemax's North American Technology Group [Member]
Initial purchase price				$ 14,000,000
Option exercised										$ 400,000
TigerDirect [Member]
Net sales			$ 12,500,000
Operating profit			$ 700,000
Acrodex, Inc. [Member]
Initial purchase price					$ 13,600,000			$ 100,000	$ 200,000
Net sales					16,700,000
Operating profit					$ 600,000
Acrodex, Inc. [Member] | Canadian Dollar [Member]
Initial purchase price | CAD						CAD 16,700
En Pointe Technologies Sales Inc [Member]
Initial purchase price							$ 15,000,000
Accrued earn-out liability included in accrued expenses and other current liabilities															13,300,000	13,200,000
Accrued earn-out liability included in other long-term liabilities															$ 3,400,000	16,500,000
Inventory							$ 2,300,000
Percentage of future adjusted gross profit							22.50%
Percentage of future service revenue							10.00%
Percentage of weighted average cost of capital															13.00%
Undiscounted estimate range outcome of earn-out liability minimum															$ 10,000,000
Undiscounted estimate range outcome of earn-out liability maximum															76,900,000
Payments of earn-out liability															13,100,000	8,900,000
Amortization expense															2,300,000	$ 1,000,000
Intangible assets acquired															8,400,000
En Pointe Technologies Sales Inc [Member] | March 31, 2018 [Member]
Contingent consideration to be paid throughout the earn out period															$ 38,600,000