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GOODWILL AND OTHER INTANGIBLE ASSETS - Change in the Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 1,258,922
Acquisitions	32,407
Translation	386
Balance, end of period	1,291,715
NAST
Goodwill [Roll Forward]
Balance, beginning of period	1,016,784
Acquisitions	0
Translation	(685)
Balance, end of period	1,016,099
Global Forwarding
Goodwill [Roll Forward]
Balance, beginning of period	182,029
Acquisitions	24,636
Translation	962
Balance, end of period	207,627
All Other and Corporate
Goodwill [Roll Forward]
Balance, beginning of period	60,109
Acquisitions	7,771
Translation	109
Balance, end of period	$ 67,989

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
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-SubTopic 20
-Section 45
-Paragraph 1
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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

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-Publisher FASB
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-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- 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

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-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

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