SEGMENT INFORMATION - Schedule of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues by Segment	$ 3,289,978	$ 2,734,372	$ 2,372,178
Operating Income (Loss) by Segment	323,076	309,146	227,438
Depreciation and Amortization by Segment	279,923	267,700	263,286
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues by Segment	(5,218)	(899)	(107)
Truckload Transportation Services
Segment Reporting Information [Line Items]
Revenues by Segment	2,428,686	2,045,073	1,843,209
Operating Income (Loss) by Segment	294,555	281,823	222,007
Depreciation and Amortization by Segment	256,768	245,169	239,858
Werner Logistics
Segment Reporting Information [Line Items]
Revenues by Segment	793,492	622,461	469,791
Operating Income (Loss) by Segment	36,184	27,873	6,005
Depreciation and Amortization by Segment	9,989	8,833	7,712
Other
Segment Reporting Information [Line Items]
Revenues by Segment	71,185	66,108	57,276
Operating Income (Loss) by Segment	(2,604)	4,947	3,839
Depreciation and Amortization by Segment	11,258	10,786	11,705
Corporate
Segment Reporting Information [Line Items]
Revenues by Segment	1,833	1,629	2,009
Operating Income (Loss) by Segment	(5,059)	(5,497)	(4,413)
Depreciation and Amortization by Segment	1,908	2,912	4,011
Subtotal
Segment Reporting Information [Line Items]
Revenues by Segment	$ 3,295,196	$ 2,735,271	$ 2,372,285