ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Acquisitions) (Details) - USD ($) $ in Thousands					12 Months Ended
	Dec. 01, 2015	Jan. 02, 2015	Apr. 30, 2014	May. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquisitions
Net cash consideration					$ 29,813	$ 2,647	$ 4,146
Bear Transportation Services, L.P. | Transportation Management (ABF Logistics)
Acquisitions
Net cash consideration	$ 24,600
Smart Lines Transportation Group, LLC | Transportation Management (ABF Logistics)
Acquisitions
Net cash consideration		$ 5,200
Acquired privately-owned businesses | Emergency & Preventative Maintenance (FleetNet)
Acquisitions
Net cash consideration			$ 2,600
Acquired privately-owned businesses | Household Goods Moving Services (ABF Moving)
Acquisitions
Net cash consideration				$ 4,100