Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income attributable to Werner	$ 6,565	$ 23,704	$ 22,342	$ 88,809
Weighted average common shares outstanding (in shares)	61,808	63,390	62,659	63,360
Dilutive effect of stock-based awards (in shares)	214	347	203	343
Shares used in computing diluted earnings per share (in shares)	62,022	63,737	62,862	63,703
Basic earnings per share (in dollars per share)	$ 0.11	$ 0.37	$ 0.36	$ 1.40
Diluted earnings per share (in dollars per share)	$ 0.11	$ 0.37	$ 0.36	$ 1.39