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GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Amortization Expense on Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Goodwill [Line Items] |  |  |  |  |
Amortization expense | $ 9,196 | $ 8,843 | $ 18,595 | $ 17,718 |
Estimated amortization expense |  |  |  |  |
Remainder of 2018 | 18,657 |  | 18,657 |  |
2019 | 37,305 |  | 37,305 |  |
2020 | 27,040 |  | 27,040 |  |
2021 | 13,520 |  | 13,520 |  |
2022 | 13,520 |  | 13,520 |  |
Thereafter | 9,737 |  | 9,737 |  |
Net | 119,779 |  | 119,779 |  | $ 141,110
NAST |  |  |  |  |
Estimated amortization expense |  |  |  |  |
Remainder of 2018 | 3,913 |  | 3,913 |  |
2019 | 7,820 |  | 7,820 |  |
2020 | 260 |  | 260 |  |
2021 | 260 |  | 260 |  |
2022 | 260 |  | 260 |  |
Thereafter | 354 |  | 354 |  |
Global Forwarding |  |  |  |  |
Estimated amortization expense |  |  |  |  |
Remainder of 2018 | 14,744 |  | 14,744 |  |
2019 | 29,485 |  | 29,485 |  |
2020 | 26,780 |  | 26,780 |  |
2021 | 13,260 |  | 13,260 |  |
2022 | 13,260 |  | 13,260 |  |
Thereafter | 9,383 |  | 9,383 |  |
Robinson Fresh |  |  |  |  |
Estimated amortization expense |  |  |  |  |
Remainder of 2018 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
2020 | 0 |  | 0 |  |
2021 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
Thereafter | 0 |  | 0 |  |
All Other and Corporate |  |  |  |  |
Estimated amortization expense |  |  |  |  |
Remainder of 2018 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
2020 | 0 |  | 0 |  |
2021 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
Thereafter | $ 0 |  | $ 0 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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