SEGMENT INFORMATION - Schedule of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues by Segment	$ 3,283,499	$ 3,289,978	$ 2,734,372
Operating Income (Loss) by Segment	176,416	323,076	309,146
Depreciation and Amortization by Segment	299,509	279,923	267,700
Subtotal
Segment Reporting Information [Line Items]
Revenues by Segment	3,301,189	3,295,196	2,735,271
Corporate
Segment Reporting Information [Line Items]
Revenues by Segment	1,883	1,833	1,629
Operating Income (Loss) by Segment	(8,862)	(5,059)	(5,497)
Depreciation and Amortization by Segment	1,328	1,908	2,912
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues by Segment	(17,690)	(5,218)	(899)
Truckload Transportation Services | Operating Segments
Segment Reporting Information [Line Items]
Revenues by Segment	2,310,810	2,428,686	2,045,073
Operating Income (Loss) by Segment	169,330	294,555	281,823
Depreciation and Amortization by Segment	271,245	256,768	245,169
Werner Logistics | Operating Segments
Segment Reporting Information [Line Items]
Revenues by Segment	910,433	793,492	622,461
Operating Income (Loss) by Segment	15,879	36,184	27,873
Depreciation and Amortization by Segment	15,395	9,989	8,833
Other | Corporate
Segment Reporting Information [Line Items]
Revenues by Segment	78,063	71,185	66,108
Operating Income (Loss) by Segment	69	(2,604)	4,947
Depreciation and Amortization by Segment	$ 11,541	$ 11,258	$ 10,786