SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule Of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Net income attributable to Werner	$ 34,233	$ 112,382	$ 241,256
Weighted average common shares outstanding (in shares)	62,450	63,374	64,125
Dilutive effect of stock-based awards (in shares)	212	344	454
Shares used in computing diluted earnings per share (in shares)	62,662	63,718	64,579
Basic earnings per share (in dollars per share)	$ 0.55	$ 1.77	$ 3.76
Diluted earnings per share (in dollars per share)	$ 0.55	$ 1.76	$ 3.74