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ACQUISITIONS - Additional Information (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2016 | Jan. 01, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase consideration, net of cash acquired |  |  |  | $ 49,068 | $ 220,203 | $ 369,833
Goodwill recorded in acquisition |  |  |  | 28,591 | $ 132,797 |
Milgram & Company Ltd. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase consideration, net of cash acquired | $ 47,300 |  |  |  |  |
Goodwill recorded in acquisition |  |  |  | $ 28,600 |  |
APC Logistics |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire business |  | $ 229,400 |  |  |  |
Freightquote |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire business |  |  | $ 398,600 |  |  |
Freightquote | Trademarks |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Indefinite-lived intangible assets acquired |  |  | $ 8,600 |  |  |

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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