RESTRUCTURING - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 21,113	$ 0
2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ (139)	17,715
Payments for restructuring			29,425
South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		19,101	19,101
Deferred tax asset		5,500	5,500
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		(21,100)	(21,100)
Personnel expenses | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(67)	1,839
Personnel expenses | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		3,350	3,350
Personnel expenses | NAST | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0	0
Personnel expenses | Global Forwarding | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		2,600	2,600
Personnel expenses | All Other and Corporate | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		750	750
Other selling, general, and administrative expenses | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		193	1,322
Payments for restructuring			415
Other selling, general, and administrative expenses | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		21,252	21,252
Other selling, general, and administrative expenses | NAST | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		4	8
Other selling, general, and administrative expenses | NAST | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0	0
Other selling, general, and administrative expenses | Global Forwarding | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		67	230
Other selling, general, and administrative expenses | Global Forwarding | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		21,012	21,012
Other selling, general, and administrative expenses | All Other and Corporate | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		122	1,084
Other selling, general, and administrative expenses | All Other and Corporate | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		240	240
Income tax benefit - South America | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(5,501)	(5,501)
Income tax benefit - South America | NAST | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0	0
Income tax benefit - South America | Global Forwarding | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(5,501)	(5,501)
Income tax benefit - South America | All Other and Corporate | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0	0
Severance And Other Operating Expenses | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Payments for restructuring		2,200
Employee Severance | Personnel expenses | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(265)	14,554
Employee Severance | Personnel expenses | South America Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 3,350	$ 3,350
Forecast | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	$ 5,700