REVENUE - Schedule of Disaggregation of Revenue by Revenue Source (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of revenue
Revenues by Segment	$ 3,283,499	$ 3,289,978	$ 2,734,372
Inter-segment eliminations
Disaggregation of revenue
Revenues by Segment	(17,690)	(5,218)	(899)
Truckload Transportation Services | Operating Segments
Disaggregation of revenue
Revenues by Segment	2,310,810	2,428,686	2,045,073
Werner Logistics | Operating Segments
Disaggregation of revenue
Revenues by Segment	910,433	793,492	622,461
Transportation services
Disaggregation of revenue
Revenues by Segment	3,203,553	3,216,960	2,666,635
Other revenues
Disaggregation of revenue
Revenues by Segment	$ 79,946	$ 73,018	$ 67,737