Revenue - Disaggregation of Revenue by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of revenue
Revenues by Segment	$ 832,714	$ 764,605
Inter-segment eliminations
Disaggregation of revenue
Revenues by Segment	(5,261)	(722)
Truckload Transportation Services
Disaggregation of revenue
Revenues by Segment	588,330	558,417
Werner Logistics
Disaggregation of revenue
Revenues by Segment	228,669	189,008
Transportation services
Disaggregation of revenue
Revenues by Segment	811,738	746,703
Other revenues
Disaggregation of revenue
Revenues by Segment	$ 20,976	$ 17,902