GOODWILL AND OTHER INTANGIBLE ASSETS - Change in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Beginning balance	$ 1,291,760	$ 1,258,922
Acquisitions	177,264	33,663
Foreign currency translation	18,163	(825)
Ending balance	1,487,187	1,291,760
NAST
Goodwill [Roll Forward]
Beginning balance	1,015,570	1,016,784
Acquisitions	176,484	0
Foreign currency translation	11,918	(1,214)
Ending balance	1,203,972	1,015,570
Global Forwarding
Goodwill [Roll Forward]
Beginning balance	208,420	182,029
Acquisitions	780	25,892
Foreign currency translation	4,782	499
Ending balance	213,982	208,420
All Other and Corporate
Goodwill [Roll Forward]
Beginning balance	67,770	60,109
Acquisitions	0	7,771
Foreign currency translation	1,463	(110)
Ending balance	$ 69,233	$ 67,770

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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Reference 3: 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.

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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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