RESTRUCTURING - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 14,132		$ 17,854
Payments for restructuring			27,216
Other Selling, General, and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,005		1,129
Payments for restructuring			310
Severance And Other Operating Expenses
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	12,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	11,681		14,819
Employee Severance | Personnel Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	13,127		16,725
Employee Severance | Personnel Expenses | NAST
Restructuring Cost and Reserve [Line Items]
Restructuring charges	327		1,156
Employee Severance | Personnel Expenses | Global Forwarding
Restructuring Cost and Reserve [Line Items]
Restructuring charges	691		2,229
Employee Severance | Personnel Expenses | All Other and Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	12,109		13,340
Employee Severance | Other Selling, General, and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,005		1,129
Employee Severance | Other Selling, General, and Administrative Expenses | NAST
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4		4
Employee Severance | Other Selling, General, and Administrative Expenses | Global Forwarding
Restructuring Cost and Reserve [Line Items]
Restructuring charges	39		163
Employee Severance | Other Selling, General, and Administrative Expenses | All Other and Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 962		$ 962
Forecast
Restructuring Cost and Reserve [Line Items]
Payments for restructuring		$ 8,700