Segment Information - Narrative (Details)	6 Months Ended
Jun. 30, 2023 reporting_unit segment
Segment Reporting Information [Line Items]
Number of reportable segments	2
Truckload Transportation Services
Segment Reporting Information [Line Items]
Number of operating units	2
Werner Logistics
Segment Reporting Information [Line Items]
Number of operating units \| reporting_unit	3

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-18

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration