Revenue - Disaggregation of Revenue by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of revenue
Revenues by Segment	$ 769,080	$ 832,714
Inter-segment eliminations
Disaggregation of revenue
Revenues by Segment	(4,071)	(5,261)
Truckload Transportation Services | Operating Segments
Disaggregation of revenue
Revenues by Segment	551,126	588,330
Werner Logistics | Operating Segments
Disaggregation of revenue
Revenues by Segment	202,482	228,669
Transportation services
Disaggregation of revenue
Revenues by Segment	749,537	811,738
Other revenues
Disaggregation of revenue
Revenues by Segment	$ 19,543	$ 20,976