Goodwill and Intangible Assets - Schedule of Carrying Amounts of Indefinite-Lived Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Balance beginning period	$ 80,552
Foreign currency translation	76
Balance ending period	83,388
Commercial [Member]
Balance beginning period	69,335
Foreign currency translation
Balance ending period	69,735
Public Sector [Member]
Balance beginning period	8,322
Foreign currency translation
Balance ending period	8,322
Canada [Member]
Balance beginning period	2,895
Foreign currency translation	76
Balance ending period	5,331
Acrodex, Inc. [Member]
Goodwill acquisition	329
Acrodex, Inc. [Member] | Commercial [Member]
Goodwill acquisition
Acrodex, Inc. [Member] | Public Sector [Member]
Goodwill acquisition
Acrodex, Inc. [Member] | Canada [Member]
Goodwill acquisition	329
Systemax [Member]
Goodwill acquisition	400
Systemax [Member] | Commercial [Member]
Goodwill acquisition	400
Systemax [Member] | Public Sector [Member]
Goodwill acquisition
Systemax [Member] | Canada [Member]
Goodwill acquisition
Stratiform, Inc [Member]
Goodwill acquisition	2,031
Stratiform, Inc [Member] | Commercial [Member]
Goodwill acquisition
Stratiform, Inc [Member] | Public Sector [Member]
Goodwill acquisition
Stratiform, Inc [Member] | Canada [Member]
Goodwill acquisition	$ 2,031