RESTRUCTURING - By Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 12,911
2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 3,722
Personnel expenses | 2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	528
Personnel expenses | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		460
Other selling, general, and administrative expenses | 2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,969
Other selling, general, and administrative expenses | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		124
Other selling, general, and administrative expenses | NAST | 2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,877
Other selling, general, and administrative expenses | NAST | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0
Other selling, general, and administrative expenses | Global Forwarding | 2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	232
Other selling, general, and administrative expenses | Global Forwarding | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		124
Other selling, general, and administrative expenses | All Other and Corporate | 2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,860
Other selling, general, and administrative expenses | All Other and Corporate | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0
Severance and Other Personnel Expenses | Personnel expenses | 2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	7,942
Severance and Other Personnel Expenses | Personnel expenses | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		3,598
Severance and Other Personnel Expenses | Personnel expenses | NAST | 2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,027
Severance and Other Personnel Expenses | Personnel expenses | NAST | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		829
Severance and Other Personnel Expenses | Personnel expenses | Global Forwarding | 2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,191
Severance and Other Personnel Expenses | Personnel expenses | Global Forwarding | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,538
Severance and Other Personnel Expenses | Personnel expenses | All Other and Corporate | 2024 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,724
Severance and Other Personnel Expenses | Personnel expenses | All Other and Corporate | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1,231