REVENUE - Schedule of Disaggregation of Revenue by Revenue Source (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of revenue
Total revenues	$ 2,974,396	$ 3,030,258	$ 3,283,499
Inter-segment eliminations
Disaggregation of revenue
Total revenues	(9,297)	(14,429)	(17,690)
Truckload Transportation Services | Reportable segment revenues
Disaggregation of revenue
Total revenues	2,051,944	2,138,293	2,310,810
Werner Logistics | Reportable segment revenues
Disaggregation of revenue
Total revenues	856,863	831,337	910,433
Transportation services
Disaggregation of revenue
Total revenues	2,899,510	2,955,201	3,203,553
Other revenues
Disaggregation of revenue
Total revenues	$ 74,886	$ 75,057	$ 79,946