REVENUE - Schedule of Disaggregation of Revenue by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of revenue
Total revenues	$ 933,927	$ 753,148	$ 1,742,537	$ 1,465,262
Inter-segment eliminations
Disaggregation of revenue
Total revenues	2	(4,749)	(105)	(8,812)
Truckload Transportation Services \| Reportable segment revenues
Disaggregation of revenue
Total revenues	702,572	517,647	1,296,884	1,019,522
Werner Logistics \| Reportable segment revenues
Disaggregation of revenue
Total revenues	211,732	221,177	407,568	416,735
Transportation services
Disaggregation of revenue
Total revenues	914,306	734,075	1,704,347	1,427,445
Other revenues
Disaggregation of revenue
Total revenues	$ 19,621	$ 19,073	$ 38,190	$ 37,817

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details