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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 01, 2015 | Jan. 02, 2015
Goodwill by reportable operating segment |  |  |  |
Balance at the beginning of the period | $ 96,465 | $ 77,078 |  |
Goodwill acquired | 12,640 | 19,387 |  |
Goodwill divested | (842) |  |  |
Purchase accounting adjustments | 612 |  |  |
Balance at the end of the period | 108,875 | 96,465 |  |
FleetNet |  |  |  |
Goodwill by reportable operating segment |  |  |  |
Balance at the beginning of the period | 630 | 630 |  |
Balance at the end of the period | 630 | 630 |  |
ArcBest |  |  |  |
Goodwill by reportable operating segment |  |  |  |
Balance at the beginning of the period | 95,835 | 76,448 |  |
Goodwill acquired | 12,640 | 19,387 |  |
Goodwill divested | (842) |  |  |
Purchase accounting adjustments | 612 |  |  |
Balance at the end of the period | $ 108,245 | $ 95,835 |  |
Smart Lines Transportation Group, LLC |  |  |  |
Goodwill by reportable operating segment |  |  |  |
Goodwill related to acquisition expected to be fully tax deductible |  |  |  | $ 4,200
Bear Transportation Services, L.P. |  |  |  |
Goodwill by reportable operating segment |  |  |  |
Goodwill related to acquisition expected to be fully tax deductible |  |  | $ 15,200 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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