Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income attributable to Werner	$ 9,465	$ 29,881	$ 15,777	$ 65,105
Weighted average common shares outstanding (in shares)	62,706	63,384	63,089	63,345
Dilutive effect of stock-based awards (in shares)	154	303	202	344
Shares used in computing diluted earnings per share (in shares)	62,860	63,687	63,291	63,689
Basic earnings per share (in dollars per share)	$ 0.15	$ 0.47	$ 0.25	$ 1.03
Diluted earnings per share (in dollars per share)	$ 0.15	$ 0.47	$ 0.25	$ 1.02