GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying Amount of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 1,484,754
Foreign currency translation	(26,451)
Balance, end of period	1,458,303
NAST
Goodwill [Roll Forward]
Balance, beginning of period	1,196,333
Foreign currency translation	(15,180)
Balance, end of period	1,181,153
Global Forwarding
Goodwill [Roll Forward]
Balance, beginning of period	210,391
Foreign currency translation	(7,839)
Balance, end of period	202,552
All Other and Corporate
Goodwill [Roll Forward]
Balance, beginning of period	78,030
Foreign currency translation	(3,432)
Balance, end of period	$ 74,598