REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 6,815,953	$ 4,803,869
NAST
Disaggregation of Revenue [Line Items]
Total revenues	4,114,889	3,211,423
Global Forwarding
Disaggregation of Revenue [Line Items]
Total revenues	2,194,397	1,156,039
All Other and Corporate
Disaggregation of Revenue [Line Items]
Total revenues	506,667	436,407
Transportation and logistics services
Disaggregation of Revenue [Line Items]
Total revenues	6,528,351	4,560,227
Transportation and logistics services | Performance obligations completed over time
Disaggregation of Revenue [Line Items]
Total revenues	6,528,351	4,560,227
Transportation and logistics services | NAST | Performance obligations completed over time
Disaggregation of Revenue [Line Items]
Total revenues	4,114,889	3,211,423
Transportation and logistics services | Global Forwarding | Performance obligations completed over time
Disaggregation of Revenue [Line Items]
Total revenues	2,194,397	1,156,039
Transportation and logistics services | All Other and Corporate | Performance obligations completed over time
Disaggregation of Revenue [Line Items]
Total revenues	219,065	192,765
Sourcing
Disaggregation of Revenue [Line Items]
Total revenues	287,602	243,642
Sourcing | Performance obligations completed at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	287,602	243,642
Sourcing | NAST | Performance obligations completed at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Sourcing | Global Forwarding | Performance obligations completed at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Sourcing | All Other and Corporate | Performance obligations completed at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	$ 287,602	$ 243,642