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SEGMENT INFORMATION - Narratives (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 reporting_unit segment | Dec. 31, 2022 | Dec. 31, 2021 | Feb. 26, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | 2 |  |  |
Gain realized on transaction closure | $ |  |  |  | $ 1.0
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 |  |  |
Dollar General | Revenue Benchmark | Customer Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk (as a percent) | 10.00% | 14.00% | 14.00% |

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