Earnings Per Share - Schedule of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income attributable to Werner	$ 23,704	$ 55,051	$ 88,809	$ 181,090
Weighted average common shares outstanding (in shares)	63,390	63,386	63,360	64,433
Dilutive effect of stock-based awards (in shares)	347	396	343	386
Shares used in computing diluted earnings per share (in shares)	63,737	63,782	63,703	64,819
Basic earnings per share (in dollars per share)	$ 0.37	$ 0.87	$ 1.40	$ 2.81
Diluted earnings per share (in dollars per share)	$ 0.37	$ 0.86	$ 1.39	$ 2.79