GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying Amount of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 1,473,600
Foreign currency translation	(6,582)
Balance, end of period	1,467,018
NAST
Goodwill [Roll Forward]
Balance, beginning of period	1,188,813
Foreign currency translation	(4,261)
Balance, end of period	1,184,552
Global Forwarding
Goodwill [Roll Forward]
Balance, beginning of period	207,599
Foreign currency translation	(1,681)
Balance, end of period	205,918
All Other and Corporate
Goodwill [Roll Forward]
Balance, beginning of period	77,188
Foreign currency translation	(640)
Balance, end of period	$ 76,548