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ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Acquisitions) (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
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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 |  |  |

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