SEGMENT INFORMATION - Schedule of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues from external customers	$ 2,955,201	$ 3,203,553	$ 3,216,960
Revenues	3,030,258	3,283,499	3,289,978
Less operating expenses:
Salaries, wages and benefits	1,034,877	1,072,558	1,020,609
Fuel	275,413	345,001	437,299
Supplies and maintenance	246,061	256,494	253,096
Taxes and licenses	97,230	102,684	97,929
Insurance and claims	145,398	138,516	147,365
Depreciation and amortization	290,405	299,509	279,923
Communications and utilities	17,195	18,480	15,856
Gains on sales of property and equipment	(15,331)	(42,440)	(88,564)
Other segment items	(12,661)	12,443	62,639
Reportable segment operating expenses	2,964,110	3,107,083	2,966,902
Operating income (loss)	66,148	176,416	323,076
Change in fair value	(419)	2,204
ReedTMS
Less operating expenses:
Change in fair value		2,700
NEHDS
Less operating expenses:
Change in fair value			2,500
Reportable Operating Segments
Segment Reporting Information [Line Items]
Revenues from external customers	2,969,630	3,221,243	3,222,178
Less operating expenses:
Salaries, wages and benefits	1,004,486	1,041,113	990,060
Fuel	274,145	343,462	435,254
Supplies and maintenance	221,449	232,921	229,007
Taxes and licenses	96,524	102,248	97,455
Insurance and claims	145,092	138,214	147,032
Depreciation and amortization	276,346	286,640	266,757
Rent and purchased transportation	854,233	898,869	779,345
Communications and utilities	15,867	17,544	14,970
Gains on sales of property and equipment	(12,083)	(46,950)	(87,282)
Other segment items	19,286	21,973	18,841
Reportable segment operating expenses	2,895,345	3,036,034	2,891,439
Operating income (loss)	74,285	185,209	330,739
Other operating segments
Less operating expenses:
Operating income (loss)	(8,137)	(8,793)	(7,663)
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues from external customers	(14,429)	(17,690)	(5,218)
Revenues	(14,429)	(17,690)	(5,218)
Corporate
Segment Reporting Information [Line Items]
Revenues	75,057	79,946	73,018
Truckload Transportation Services
Segment Reporting Information [Line Items]
Revenues from external customers	2,123,864	2,293,120	2,423,468
Truckload Transportation Services | Reportable Operating Segments
Segment Reporting Information [Line Items]
Revenues from external customers	2,138,293	2,310,810	2,428,686
Revenues	2,138,293	2,310,810	2,428,686
Less operating expenses:
Salaries, wages and benefits	922,921	951,712	920,166
Fuel	272,570	341,126	430,962
Supplies and maintenance	211,847	224,988	221,821
Taxes and licenses	95,541	101,149	96,461
Insurance and claims	141,654	134,319	143,914
Depreciation and amortization	261,170	271,245	256,768
Rent and purchased transportation	139,848	130,076	119,506
Communications and utilities	13,884	13,908	13,287
Gains on sales of property and equipment	(10,993)	(45,453)	(85,268)
Other segment items	14,685	18,410	16,514
Reportable segment operating expenses	2,063,127	2,141,480	2,134,131
Operating income (loss)	75,166	169,330	294,555
Truckload Transportation Services | Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues from external customers	(14,429)	(17,690)	(5,218)
Werner Logistics
Segment Reporting Information [Line Items]
Revenues from external customers	831,337	910,433	793,492
Werner Logistics | Reportable Operating Segments
Segment Reporting Information [Line Items]
Revenues from external customers	831,337	910,433	793,492
Revenues	831,337	910,433	793,492
Less operating expenses:
Salaries, wages and benefits	81,565	89,401	69,894
Fuel	1,575	2,336	4,292
Supplies and maintenance	9,602	7,933	7,186
Taxes and licenses	983	1,099	994
Insurance and claims	3,438	3,895	3,118
Depreciation and amortization	15,176	15,395	9,989
Rent and purchased transportation	714,385	768,793	659,839
Communications and utilities	1,983	3,636	1,683
Gains on sales of property and equipment	(1,090)	(1,497)	(2,014)
Other segment items	4,601	3,563	2,327
Reportable segment operating expenses	832,218	894,554	757,308
Operating income (loss)	(881)	15,879	36,184
Werner Logistics | Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues from external customers	$ 0	$ 0	$ 0