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GOODWILL AND OTHER INTANGIBLE ASSETS - Change in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |
Balance, beginning of year | $ 1,108,337 | $ 825,038
Acquisitions | 132,797 | 287,220
Translation | (8,338) | (3,921)
Balance, end of year | 1,232,796 | 1,108,337
NAST |  |
Goodwill [Roll Forward] |  |
Balance, beginning of year | 815,639 | 607,156
Acquisitions | 97,727 | 211,369
Translation | (6,136) | (2,886)
Balance, end of year | 907,230 | 815,639
Global Forwarding |  |
Goodwill [Roll Forward] |  |
Balance, beginning of year | 142,993 | 106,443
Acquisitions | 17,133 | 37,056
Translation | (1,076) | (506)
Balance, end of year | 159,050 | 142,993
Robinson Fresh |  |
Goodwill [Roll Forward] |  |
Balance, beginning of year | 125,469 | 93,398
Acquisitions | 15,033 | 32,515
Translation | (944) | (444)
Balance, end of year | 139,558 | 125,469
All Other and Corporate |  |
Goodwill [Roll Forward] |  |
Balance, beginning of year | 24,236 | 18,041
Acquisitions | 2,904 | 6,280
Translation | (182) | (85)
Balance, end of year | $ 26,958 | $ 24,236

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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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- 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 Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments 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 (g) -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 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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