GOODWILL AND OTHER INTANGIBLE ASSETS - Change in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning balance	$ 1,258,922	$ 1,275,816
Acquisitions	33,663
Acquisitions and adjustments		(7)
Foreign currency translation	(825)	(16,887)
Ending balance	1,291,760	1,258,922
NAST
Goodwill [Roll Forward]
Beginning balance	1,016,784	1,029,122
Acquisitions	0
Acquisitions and adjustments		(40)
Foreign currency translation	(1,214)	(12,298)
Ending balance	1,015,570	1,016,784
Global Forwarding
Goodwill [Roll Forward]
Beginning balance	182,029	185,873
Acquisitions	25,892
Acquisitions and adjustments		33
Foreign currency translation	499	(3,877)
Ending balance	208,420	182,029
All Other and Corporate
Goodwill [Roll Forward]
Beginning balance	60,109	60,821
Acquisitions	7,771
Acquisitions and adjustments		0
Foreign currency translation	(110)	(712)
Ending balance	$ 67,770	$ 60,109

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.

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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.

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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.

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