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GOODWILL AND OTHER INTANGIBLE ASSETS - Change in the Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 1,275,816
Adjustments	(308)
Translation	(9,730)
Balance, end of period	1,265,778
NAST
Goodwill [Roll Forward]
Balance, beginning of period	921,486
Adjustments	(40)
Translation	(6,305)
Balance, end of period	915,141
Global Forwarding
Goodwill [Roll Forward]
Balance, beginning of period	185,873
Adjustments	(268)
Translation	(2,301)
Balance, end of period	183,304
Robinson Fresh
Goodwill [Roll Forward]
Balance, beginning of period	141,185
Adjustments	0
Translation	(942)
Balance, end of period	140,243
All Other and Corporate
Goodwill [Roll Forward]
Balance, beginning of period	27,272
Adjustments	0
Translation	(182)
Balance, end of period	$ 27,090

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
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- Definition

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