GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying Amount of Goodwill (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 1,291,760
Acquisitions	176,904
Translation	(17,665)
Balance, end of period	1,450,999
NAST
Goodwill [Roll Forward]
Balance, beginning of period	1,015,570
Acquisitions	176,397
Translation	(12,592)
Balance, end of period	1,179,375
Global Forwarding
Goodwill [Roll Forward]
Balance, beginning of period	208,420
Acquisitions	507
Translation	(4,222)
Balance, end of period	204,705
All Other and Corporate
Goodwill [Roll Forward]
Balance, beginning of period	67,770
Acquisitions	0
Translation	(851)
Balance, end of period	$ 66,919

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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-Paragraph 1
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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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