GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Goodwill by reportable operating segment
Balance at the beginning of the period	$ 96,465
Goodwill acquired	13,584
Purchase accounting adjustments	438
Balance at the end of the period	110,487
Premium Logistics (Panther)
Goodwill by reportable operating segment
Balance at the beginning of the period	71,096
Balance at the end of the period	71,096
Transportation Management (ABF Logistics)
Goodwill by reportable operating segment
Balance at the beginning of the period	19,387
Goodwill acquired	13,584
Purchase accounting adjustments	438
Balance at the end of the period	33,409
Emergency & Preventative Maintenance (FleetNet)
Goodwill by reportable operating segment
Balance at the beginning of the period	630
Balance at the end of the period	630
Household Goods Moving Services (ABF Moving)
Goodwill by reportable operating segment
Balance at the beginning of the period	5,352
Balance at the end of the period	$ 5,352